diff --git a/BUILD b/BUILD
index b050961..06a894a 100644
--- a/BUILD
+++ b/BUILD
@@ -21,7 +21,8 @@
     resources = glob(["src/main/resources/**/*"]),
     deps = [
         "@commons-codec//jar:neverlink",
-        "@scribe//jar",
+        "@jackson-databind//jar",
+        "@scribejava-core//jar",
     ],
 )
 
@@ -40,6 +41,6 @@
     visibility = ["//visibility:public"],
     exports = PLUGIN_DEPS + PLUGIN_TEST_DEPS + [
         ":oauth__plugin",
-        "@scribe//jar",
+        "@mockito//jar",
     ],
 )
diff --git a/external_plugin_deps.bzl b/external_plugin_deps.bzl
index e560344..4615c8d 100644
--- a/external_plugin_deps.bzl
+++ b/external_plugin_deps.bzl
@@ -1,10 +1,24 @@
 load("//tools/bzl:maven_jar.bzl", "maven_jar")
 
 def external_plugin_deps(omit_commons_codec = True):
+    JACKSON_VERS = "2.10.2"
     maven_jar(
-        name = "scribe",
-        artifact = "org.scribe:scribe:1.3.7",
-        sha1 = "583921bed46635d9f529ef5f14f7c9e83367bc6e",
+        name = "scribejava-core",
+        artifact = "com.github.scribejava:scribejava-core:6.9.0",
+        sha1 = "ed761f450d8382f75787e8fee9ae52e7ec768747",
+    )
+    maven_jar(
+        name = "jackson-annotations",
+        artifact = "com.fasterxml.jackson.core:jackson-annotations:" + JACKSON_VERS,
+        sha1 = "3a13b6105946541b8d4181a0506355b5fae63260",
+    )
+    maven_jar(
+        name = "jackson-databind",
+        artifact = "com.fasterxml.jackson.core:jackson-databind:" + JACKSON_VERS,
+        sha1 = "0528de95f198afafbcfb0c09d2e43b6e0ea663ec",
+        deps = [
+            "@jackson-annotations//jar",
+        ],
     )
     if not omit_commons_codec:
         maven_jar(
diff --git a/src/main/java/com/googlesource/gerrit/plugins/oauth/AirVantageApi.java b/src/main/java/com/googlesource/gerrit/plugins/oauth/AirVantageApi.java
index 02f4bd5..2e769a5 100644
--- a/src/main/java/com/googlesource/gerrit/plugins/oauth/AirVantageApi.java
+++ b/src/main/java/com/googlesource/gerrit/plugins/oauth/AirVantageApi.java
@@ -14,43 +14,31 @@
 
 package com.googlesource.gerrit.plugins.oauth;
 
-import static java.lang.String.format;
-
-import org.scribe.builder.api.DefaultApi20;
-import org.scribe.extractors.AccessTokenExtractor;
-import org.scribe.extractors.JsonTokenExtractor;
-import org.scribe.model.OAuthConfig;
-import org.scribe.model.Verb;
-import org.scribe.oauth.OAuthService;
+import com.github.scribejava.core.builder.api.DefaultApi20;
+import com.github.scribejava.core.extractors.OAuth2AccessTokenExtractor;
+import com.github.scribejava.core.extractors.TokenExtractor;
+import com.github.scribejava.core.model.OAuth2AccessToken;
+import com.github.scribejava.core.oauth2.bearersignature.BearerSignature;
+import com.github.scribejava.core.oauth2.bearersignature.BearerSignatureURIQueryParameter;
 
 public class AirVantageApi extends DefaultApi20 {
-
-  private static final String AUTHORIZE_URL =
-      "https://eu.airvantage.net/api/oauth/authorize?client_id=%s&response_type=code";
-  private static final String ACCESS_TOKEN_ENDPOINT = "https://eu.airvantage.net/api/oauth/token";
-
   @Override
-  public String getAuthorizationUrl(OAuthConfig config) {
-    return format(AUTHORIZE_URL, config.getApiKey());
+  public String getAuthorizationBaseUrl() {
+    return "https://eu.airvantage.net/api/oauth/authorize";
   }
 
   @Override
   public String getAccessTokenEndpoint() {
-    return ACCESS_TOKEN_ENDPOINT;
+    return "https://eu.airvantage.net/api/oauth/token";
   }
 
   @Override
-  public Verb getAccessTokenVerb() {
-    return Verb.POST;
+  public BearerSignature getBearerSignature() {
+    return BearerSignatureURIQueryParameter.instance();
   }
 
   @Override
-  public AccessTokenExtractor getAccessTokenExtractor() {
-    return new JsonTokenExtractor();
-  }
-
-  @Override
-  public OAuthService createService(OAuthConfig config) {
-    return new OAuth20ServiceImpl(this, config);
+  public TokenExtractor<OAuth2AccessToken> getAccessTokenExtractor() {
+    return OAuth2AccessTokenExtractor.instance();
   }
 }
diff --git a/src/main/java/com/googlesource/gerrit/plugins/oauth/AirVantageOAuthService.java b/src/main/java/com/googlesource/gerrit/plugins/oauth/AirVantageOAuthService.java
index a1ec591..0af9316 100644
--- a/src/main/java/com/googlesource/gerrit/plugins/oauth/AirVantageOAuthService.java
+++ b/src/main/java/com/googlesource/gerrit/plugins/oauth/AirVantageOAuthService.java
@@ -18,6 +18,12 @@
 import static javax.servlet.http.HttpServletResponse.SC_OK;
 import static org.slf4j.LoggerFactory.getLogger;
 
+import com.github.scribejava.core.builder.ServiceBuilder;
+import com.github.scribejava.core.model.OAuth2AccessToken;
+import com.github.scribejava.core.model.OAuthRequest;
+import com.github.scribejava.core.model.Response;
+import com.github.scribejava.core.model.Verb;
+import com.github.scribejava.core.oauth.OAuth20Service;
 import com.google.common.base.CharMatcher;
 import com.google.gerrit.extensions.annotations.PluginName;
 import com.google.gerrit.extensions.auth.oauth.OAuthServiceProvider;
@@ -33,13 +39,7 @@
 import com.google.inject.Provider;
 import com.google.inject.Singleton;
 import java.io.IOException;
-import org.scribe.builder.ServiceBuilder;
-import org.scribe.model.OAuthRequest;
-import org.scribe.model.Response;
-import org.scribe.model.Token;
-import org.scribe.model.Verb;
-import org.scribe.model.Verifier;
-import org.scribe.oauth.OAuthService;
+import java.util.concurrent.ExecutionException;
 import org.slf4j.Logger;
 
 @Singleton
@@ -49,7 +49,7 @@
   private static final String AV_PROVIDER_PREFIX = "airvantage-oauth:";
   private static final String PROTECTED_RESOURCE_URL =
       "https://eu.airvantage.net/api/v1/users/current";
-  private final OAuthService service;
+  private final OAuth20Service service;
 
   @Inject
   AirVantageOAuthService(
@@ -60,44 +60,47 @@
     String canonicalWebUrl = CharMatcher.is('/').trimTrailingFrom(urlProvider.get()) + "/";
 
     service =
-        new ServiceBuilder()
-            .provider(AirVantageApi.class)
-            .apiKey(cfg.getString(InitOAuth.CLIENT_ID))
+        new ServiceBuilder(cfg.getString(InitOAuth.CLIENT_ID))
             .apiSecret(cfg.getString(InitOAuth.CLIENT_SECRET))
             .callback(canonicalWebUrl + "oauth")
-            .build();
+            .build(new AirVantageApi());
   }
 
   @Override
   public OAuthUserInfo getUserInfo(OAuthToken token) throws IOException {
     OAuthRequest request = new OAuthRequest(Verb.GET, PROTECTED_RESOURCE_URL);
-    Token t = new Token(token.getToken(), token.getSecret(), token.getRaw());
+    OAuth2AccessToken t = new OAuth2AccessToken(token.getToken(), token.getRaw());
     service.signRequest(t, request);
-    Response response = request.send();
-    if (response.getCode() != SC_OK) {
-      throw new IOException(
-          String.format(
-              "Status %s (%s) for request %s",
-              response.getCode(), response.getBody(), request.getUrl()));
-    }
-    JsonElement userJson = JSON.newGson().fromJson(response.getBody(), JsonElement.class);
-    if (log.isDebugEnabled()) {
-      log.debug("User info response: {}", response.getBody());
-    }
-    if (userJson.isJsonObject()) {
-      JsonObject jsonObject = userJson.getAsJsonObject();
-      JsonElement id = jsonObject.get("uid");
-      if (id == null || id.isJsonNull()) {
-        throw new IOException("Response doesn't contain uid field");
+
+    JsonElement userJson = null;
+    try (Response response = service.execute(request)) {
+      if (response.getCode() != SC_OK) {
+        throw new IOException(
+            String.format(
+                "Status %s (%s) for request %s",
+                response.getCode(), response.getBody(), request.getUrl()));
       }
-      JsonElement email = jsonObject.get("email");
-      JsonElement name = jsonObject.get("name");
-      return new OAuthUserInfo(
-          AV_PROVIDER_PREFIX + id.getAsString(),
-          null,
-          email.getAsString(),
-          name.getAsString(),
-          id.getAsString());
+      userJson = JSON.newGson().fromJson(response.getBody(), JsonElement.class);
+      if (log.isDebugEnabled()) {
+        log.debug("User info response: {}", response.getBody());
+      }
+      if (userJson.isJsonObject()) {
+        JsonObject jsonObject = userJson.getAsJsonObject();
+        JsonElement id = jsonObject.get("uid");
+        if (id == null || id.isJsonNull()) {
+          throw new IOException("Response doesn't contain uid field");
+        }
+        JsonElement email = jsonObject.get("email");
+        JsonElement name = jsonObject.get("name");
+        return new OAuthUserInfo(
+            AV_PROVIDER_PREFIX + id.getAsString(),
+            null,
+            email.getAsString(),
+            name.getAsString(),
+            id.getAsString());
+      }
+    } catch (ExecutionException | InterruptedException e) {
+      throw new RuntimeException("Cannot retrieve user info resource", e);
     }
 
     throw new IOException(String.format("Invalid JSON '%s': not a JSON Object", userJson));
@@ -105,14 +108,20 @@
 
   @Override
   public OAuthToken getAccessToken(OAuthVerifier rv) {
-    Verifier vi = new Verifier(rv.getValue());
-    Token to = service.getAccessToken(null, vi);
-    return new OAuthToken(to.getToken(), to.getSecret(), to.getRawResponse());
+    try {
+      OAuth2AccessToken accessToken = service.getAccessToken(rv.getValue());
+      return new OAuthToken(
+          accessToken.getAccessToken(), accessToken.getTokenType(), accessToken.getRawResponse());
+    } catch (InterruptedException | ExecutionException | IOException e) {
+      String msg = "Cannot retrieve access token";
+      log.error(msg, e);
+      throw new RuntimeException(msg, e);
+    }
   }
 
   @Override
   public String getAuthorizationUrl() {
-    return service.getAuthorizationUrl(null);
+    return service.getAuthorizationUrl();
   }
 
   @Override
diff --git a/src/main/java/com/googlesource/gerrit/plugins/oauth/BitbucketApi.java b/src/main/java/com/googlesource/gerrit/plugins/oauth/BitbucketApi.java
index de0f5ea..a68ae4b 100644
--- a/src/main/java/com/googlesource/gerrit/plugins/oauth/BitbucketApi.java
+++ b/src/main/java/com/googlesource/gerrit/plugins/oauth/BitbucketApi.java
@@ -14,137 +14,31 @@
 
 package com.googlesource.gerrit.plugins.oauth;
 
-import static com.google.gerrit.json.OutputFormat.JSON;
-import static java.lang.String.format;
-import static javax.servlet.http.HttpServletResponse.SC_OK;
-import static org.scribe.model.OAuthConstants.ACCESS_TOKEN;
-import static org.scribe.model.OAuthConstants.CODE;
-
-import com.google.common.io.BaseEncoding;
-import com.google.gson.JsonElement;
-import com.google.gson.JsonObject;
-import org.scribe.builder.api.DefaultApi20;
-import org.scribe.exceptions.OAuthException;
-import org.scribe.extractors.AccessTokenExtractor;
-import org.scribe.model.OAuthConfig;
-import org.scribe.model.OAuthRequest;
-import org.scribe.model.Response;
-import org.scribe.model.Token;
-import org.scribe.model.Verb;
-import org.scribe.model.Verifier;
-import org.scribe.oauth.OAuthService;
+import com.github.scribejava.core.builder.api.DefaultApi20;
+import com.github.scribejava.core.extractors.OAuth2AccessTokenExtractor;
+import com.github.scribejava.core.extractors.TokenExtractor;
+import com.github.scribejava.core.model.OAuth2AccessToken;
+import com.github.scribejava.core.oauth2.bearersignature.BearerSignature;
+import com.github.scribejava.core.oauth2.bearersignature.BearerSignatureURIQueryParameter;
 
 public class BitbucketApi extends DefaultApi20 {
-
-  private static final String AUTHORIZE_URL =
-      "https://bitbucket.org/site/oauth2/authorize?client_id=%s&response_type=code";
-  private static final String ACCESS_TOKEN_ENDPOINT =
-      "https://bitbucket.org/site/oauth2/access_token";
-
-  public BitbucketApi() {}
-
   @Override
-  public String getAuthorizationUrl(OAuthConfig config) {
-    return format(AUTHORIZE_URL, config.getApiKey());
+  public String getAuthorizationBaseUrl() {
+    return "https://bitbucket.org/site/oauth2/authorize";
   }
 
   @Override
   public String getAccessTokenEndpoint() {
-    return ACCESS_TOKEN_ENDPOINT;
+    return "https://bitbucket.org/site/oauth2/access_token";
   }
 
   @Override
-  public Verb getAccessTokenVerb() {
-    return Verb.POST;
+  public BearerSignature getBearerSignature() {
+    return BearerSignatureURIQueryParameter.instance();
   }
 
   @Override
-  public OAuthService createService(OAuthConfig config) {
-    return new BitbucketOAuthService(this, config);
-  }
-
-  @Override
-  public AccessTokenExtractor getAccessTokenExtractor() {
-    return new BitbucketTokenExtractor();
-  }
-
-  private static final class BitbucketOAuthService implements OAuthService {
-    private static final String VERSION = "2.0";
-
-    private static final String GRANT_TYPE = "grant_type";
-    private static final String GRANT_TYPE_VALUE = "authorization_code";
-
-    private final DefaultApi20 api;
-    private final OAuthConfig config;
-
-    private BitbucketOAuthService(DefaultApi20 api, OAuthConfig config) {
-      this.config = config;
-      this.api = api;
-    }
-
-    @Override
-    public Token getAccessToken(Token token, Verifier verifier) {
-      OAuthRequest request =
-          new OAuthRequest(api.getAccessTokenVerb(), api.getAccessTokenEndpoint());
-      request.addHeader("Authorization", prepareAuthorizationHeaderValue());
-      request.addBodyParameter(GRANT_TYPE, GRANT_TYPE_VALUE);
-      request.addBodyParameter(CODE, verifier.getValue());
-      Response response = request.send();
-      if (response.getCode() == SC_OK) {
-        Token t = api.getAccessTokenExtractor().extract(response.getBody());
-        return new Token(t.getToken(), config.getApiSecret());
-      }
-
-      throw new OAuthException(
-          String.format(
-              "Error response received: %s, HTTP status: %s",
-              response.getBody(), response.getCode()));
-    }
-
-    private String prepareAuthorizationHeaderValue() {
-      String value = String.format("%s:%s", config.getApiKey(), config.getApiSecret());
-      String valueBase64 = BaseEncoding.base64().encode(value.getBytes());
-      return String.format("Basic %s", valueBase64);
-    }
-
-    @Override
-    public Token getRequestToken() {
-      throw new UnsupportedOperationException(
-          "Unsupported operation, please use 'getAuthorizationUrl' and redirect your users there");
-    }
-
-    @Override
-    public String getVersion() {
-      return VERSION;
-    }
-
-    @Override
-    public void signRequest(Token token, OAuthRequest request) {
-      request.addQuerystringParameter(ACCESS_TOKEN, token.getToken());
-    }
-
-    @Override
-    public String getAuthorizationUrl(Token token) {
-      return api.getAuthorizationUrl(config);
-    }
-  }
-
-  private static final class BitbucketTokenExtractor implements AccessTokenExtractor {
-
-    @Override
-    public Token extract(String response) {
-      JsonElement json = JSON.newGson().fromJson(response, JsonElement.class);
-      if (json.isJsonObject()) {
-        JsonObject jsonObject = json.getAsJsonObject();
-        JsonElement id = jsonObject.get(ACCESS_TOKEN);
-        if (id == null || id.isJsonNull()) {
-          throw new OAuthException("Response doesn't contain 'access_token' field");
-        }
-        JsonElement accessToken = jsonObject.get(ACCESS_TOKEN);
-        return new Token(accessToken.getAsString(), "");
-      }
-
-      throw new OAuthException(String.format("Invalid JSON '%s': not a JSON Object", json));
-    }
+  public TokenExtractor<OAuth2AccessToken> getAccessTokenExtractor() {
+    return OAuth2AccessTokenExtractor.instance();
   }
 }
diff --git a/src/main/java/com/googlesource/gerrit/plugins/oauth/BitbucketOAuthService.java b/src/main/java/com/googlesource/gerrit/plugins/oauth/BitbucketOAuthService.java
index c1524e9..accf586 100644
--- a/src/main/java/com/googlesource/gerrit/plugins/oauth/BitbucketOAuthService.java
+++ b/src/main/java/com/googlesource/gerrit/plugins/oauth/BitbucketOAuthService.java
@@ -18,6 +18,12 @@
 import static javax.servlet.http.HttpServletResponse.SC_OK;
 import static org.slf4j.LoggerFactory.getLogger;
 
+import com.github.scribejava.core.builder.ServiceBuilder;
+import com.github.scribejava.core.model.OAuth2AccessToken;
+import com.github.scribejava.core.model.OAuthRequest;
+import com.github.scribejava.core.model.Response;
+import com.github.scribejava.core.model.Verb;
+import com.github.scribejava.core.oauth.OAuth20Service;
 import com.google.common.base.CharMatcher;
 import com.google.gerrit.extensions.annotations.PluginName;
 import com.google.gerrit.extensions.auth.oauth.OAuthServiceProvider;
@@ -33,13 +39,7 @@
 import com.google.inject.Provider;
 import com.google.inject.Singleton;
 import java.io.IOException;
-import org.scribe.builder.ServiceBuilder;
-import org.scribe.model.OAuthRequest;
-import org.scribe.model.Response;
-import org.scribe.model.Token;
-import org.scribe.model.Verb;
-import org.scribe.model.Verifier;
-import org.scribe.oauth.OAuthService;
+import java.util.concurrent.ExecutionException;
 import org.slf4j.Logger;
 
 @Singleton
@@ -49,7 +49,7 @@
   private static final String BITBUCKET_PROVIDER_PREFIX = "bitbucket-oauth:";
   private static final String PROTECTED_RESOURCE_URL = "https://bitbucket.org/api/1.0/user/";
   private final boolean fixLegacyUserId;
-  private final OAuthService service;
+  private final OAuth20Service service;
 
   @Inject
   BitbucketOAuthService(
@@ -61,46 +61,50 @@
     String canonicalWebUrl = CharMatcher.is('/').trimTrailingFrom(urlProvider.get()) + "/";
     fixLegacyUserId = cfg.getBoolean(InitOAuth.FIX_LEGACY_USER_ID, false);
     service =
-        new ServiceBuilder()
-            .provider(BitbucketApi.class)
-            .apiKey(cfg.getString(InitOAuth.CLIENT_ID))
+        new ServiceBuilder(cfg.getString(InitOAuth.CLIENT_ID))
             .apiSecret(cfg.getString(InitOAuth.CLIENT_SECRET))
             .callback(canonicalWebUrl + "oauth")
-            .build();
+            .build(new BitbucketApi());
   }
 
   @Override
   public OAuthUserInfo getUserInfo(OAuthToken token) throws IOException {
     OAuthRequest request = new OAuthRequest(Verb.GET, PROTECTED_RESOURCE_URL);
-    Token t = new Token(token.getToken(), token.getSecret(), token.getRaw());
+    OAuth2AccessToken t = new OAuth2AccessToken(token.getToken(), token.getRaw());
     service.signRequest(t, request);
-    Response response = request.send();
-    if (response.getCode() != SC_OK) {
-      throw new IOException(
-          String.format(
-              "Status %s (%s) for request %s",
-              response.getCode(), response.getBody(), request.getUrl()));
-    }
-    JsonElement userJson = JSON.newGson().fromJson(response.getBody(), JsonElement.class);
-    if (log.isDebugEnabled()) {
-      log.debug("User info response: {}", response.getBody());
-    }
-    if (userJson.isJsonObject()) {
-      JsonObject jsonObject = userJson.getAsJsonObject();
-      JsonObject userObject = jsonObject.getAsJsonObject("user");
-      if (userObject == null || userObject.isJsonNull()) {
-        throw new IOException("Response doesn't contain 'user' field");
-      }
-      JsonElement usernameElement = userObject.get("username");
-      String username = usernameElement.getAsString();
 
-      JsonElement displayName = jsonObject.get("display_name");
-      return new OAuthUserInfo(
-          BITBUCKET_PROVIDER_PREFIX + username,
-          username,
-          null,
-          displayName == null || displayName.isJsonNull() ? null : displayName.getAsString(),
-          fixLegacyUserId ? username : null);
+    JsonElement userJson = null;
+    try (Response response = service.execute(request)) {
+
+      if (response.getCode() != SC_OK) {
+        throw new IOException(
+            String.format(
+                "Status %s (%s) for request %s",
+                response.getCode(), response.getBody(), request.getUrl()));
+      }
+      userJson = JSON.newGson().fromJson(response.getBody(), JsonElement.class);
+      if (log.isDebugEnabled()) {
+        log.debug("User info response: {}", response.getBody());
+      }
+      if (userJson.isJsonObject()) {
+        JsonObject jsonObject = userJson.getAsJsonObject();
+        JsonObject userObject = jsonObject.getAsJsonObject("user");
+        if (userObject == null || userObject.isJsonNull()) {
+          throw new IOException("Response doesn't contain 'user' field");
+        }
+        JsonElement usernameElement = userObject.get("username");
+        String username = usernameElement.getAsString();
+
+        JsonElement displayName = jsonObject.get("display_name");
+        return new OAuthUserInfo(
+            BITBUCKET_PROVIDER_PREFIX + username,
+            username,
+            null,
+            displayName == null || displayName.isJsonNull() ? null : displayName.getAsString(),
+            fixLegacyUserId ? username : null);
+      }
+    } catch (ExecutionException | InterruptedException e) {
+      throw new RuntimeException("Cannot retrieve user info resource", e);
     }
 
     throw new IOException(String.format("Invalid JSON '%s': not a JSON Object", userJson));
@@ -108,14 +112,20 @@
 
   @Override
   public OAuthToken getAccessToken(OAuthVerifier rv) {
-    Verifier vi = new Verifier(rv.getValue());
-    Token to = service.getAccessToken(null, vi);
-    return new OAuthToken(to.getToken(), to.getSecret(), to.getRawResponse());
+    try {
+      OAuth2AccessToken accessToken = service.getAccessToken(rv.getValue());
+      return new OAuthToken(
+          accessToken.getAccessToken(), accessToken.getTokenType(), accessToken.getRawResponse());
+    } catch (InterruptedException | ExecutionException | IOException e) {
+      String msg = "Cannot retrieve access token";
+      log.error(msg, e);
+      throw new RuntimeException(msg, e);
+    }
   }
 
   @Override
   public String getAuthorizationUrl() {
-    return service.getAuthorizationUrl(null);
+    return service.getAuthorizationUrl();
   }
 
   @Override
diff --git a/src/main/java/com/googlesource/gerrit/plugins/oauth/CasApi.java b/src/main/java/com/googlesource/gerrit/plugins/oauth/CasApi.java
index 76d4011..450549f 100644
--- a/src/main/java/com/googlesource/gerrit/plugins/oauth/CasApi.java
+++ b/src/main/java/com/googlesource/gerrit/plugins/oauth/CasApi.java
@@ -14,15 +14,15 @@
 
 package com.googlesource.gerrit.plugins.oauth;
 
-import org.scribe.builder.api.DefaultApi20;
-import org.scribe.model.OAuthConfig;
-import org.scribe.model.Verb;
-import org.scribe.oauth.OAuthService;
-import org.scribe.utils.OAuthEncoder;
+import com.github.scribejava.core.builder.api.DefaultApi20;
+import com.github.scribejava.core.extractors.OAuth2AccessTokenExtractor;
+import com.github.scribejava.core.extractors.TokenExtractor;
+import com.github.scribejava.core.model.OAuth2AccessToken;
+import com.github.scribejava.core.oauth2.bearersignature.BearerSignature;
+import com.github.scribejava.core.oauth2.bearersignature.BearerSignatureURIQueryParameter;
 
 public class CasApi extends DefaultApi20 {
-  private static final String AUTHORIZE_URL =
-      "%s/oauth2.0/authorize?response_type=code&client_id=%s&redirect_uri=%s";
+  private static final String AUTHORIZE_URL = "%s/oauth2.0/authorize";
 
   private final String rootUrl;
 
@@ -36,18 +36,17 @@
   }
 
   @Override
-  public String getAuthorizationUrl(OAuthConfig config) {
-    return String.format(
-        AUTHORIZE_URL, rootUrl, config.getApiKey(), OAuthEncoder.encode(config.getCallback()));
+  public String getAuthorizationBaseUrl() {
+    return String.format(AUTHORIZE_URL, rootUrl);
   }
 
   @Override
-  public Verb getAccessTokenVerb() {
-    return Verb.POST;
+  public BearerSignature getBearerSignature() {
+    return BearerSignatureURIQueryParameter.instance();
   }
 
   @Override
-  public OAuthService createService(OAuthConfig config) {
-    return new OAuth20ServiceImpl(this, config);
+  public TokenExtractor<OAuth2AccessToken> getAccessTokenExtractor() {
+    return OAuth2AccessTokenExtractor.instance();
   }
 }
diff --git a/src/main/java/com/googlesource/gerrit/plugins/oauth/CasOAuthService.java b/src/main/java/com/googlesource/gerrit/plugins/oauth/CasOAuthService.java
index 09635b1..d76769a 100644
--- a/src/main/java/com/googlesource/gerrit/plugins/oauth/CasOAuthService.java
+++ b/src/main/java/com/googlesource/gerrit/plugins/oauth/CasOAuthService.java
@@ -16,6 +16,12 @@
 
 import static com.google.gerrit.json.OutputFormat.JSON;
 
+import com.github.scribejava.core.builder.ServiceBuilder;
+import com.github.scribejava.core.model.OAuth2AccessToken;
+import com.github.scribejava.core.model.OAuthRequest;
+import com.github.scribejava.core.model.Response;
+import com.github.scribejava.core.model.Verb;
+import com.github.scribejava.core.oauth.OAuth20Service;
 import com.google.common.base.CharMatcher;
 import com.google.gerrit.extensions.annotations.PluginName;
 import com.google.gerrit.extensions.auth.oauth.OAuthServiceProvider;
@@ -34,14 +40,8 @@
 import com.google.inject.Singleton;
 import java.io.IOException;
 import java.net.URI;
+import java.util.concurrent.ExecutionException;
 import javax.servlet.http.HttpServletResponse;
-import org.scribe.builder.ServiceBuilder;
-import org.scribe.model.OAuthRequest;
-import org.scribe.model.Response;
-import org.scribe.model.Token;
-import org.scribe.model.Verb;
-import org.scribe.model.Verifier;
-import org.scribe.oauth.OAuthService;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
@@ -54,7 +54,7 @@
 
   private final String rootUrl;
   private final boolean fixLegacyUserId;
-  private final OAuthService service;
+  private final OAuth20Service service;
 
   @Inject
   CasOAuthService(
@@ -69,80 +69,82 @@
     String canonicalWebUrl = CharMatcher.is('/').trimTrailingFrom(urlProvider.get()) + "/";
     fixLegacyUserId = cfg.getBoolean(InitOAuth.FIX_LEGACY_USER_ID, false);
     service =
-        new ServiceBuilder()
-            .provider(new CasApi(rootUrl))
-            .apiKey(cfg.getString(InitOAuth.CLIENT_ID))
+        new ServiceBuilder(cfg.getString(InitOAuth.CLIENT_ID))
             .apiSecret(cfg.getString(InitOAuth.CLIENT_SECRET))
             .callback(canonicalWebUrl + "oauth")
-            .build();
+            .build(new CasApi(rootUrl));
   }
 
   @Override
   public OAuthUserInfo getUserInfo(OAuthToken token) throws IOException {
-    final String protectedResourceUrl = String.format(PROTECTED_RESOURCE_URL, rootUrl);
-    OAuthRequest request = new OAuthRequest(Verb.GET, protectedResourceUrl);
-    Token t = new Token(token.getToken(), token.getSecret(), token.getRaw());
+    OAuthRequest request =
+        new OAuthRequest(Verb.GET, String.format(PROTECTED_RESOURCE_URL, rootUrl));
+    OAuth2AccessToken t = new OAuth2AccessToken(token.getToken(), token.getRaw());
     service.signRequest(t, request);
 
-    Response response = request.send();
-    if (response.getCode() != HttpServletResponse.SC_OK) {
-      throw new IOException(
-          String.format(
-              "Status %s (%s) for request %s",
-              response.getCode(), response.getBody(), request.getUrl()));
-    }
-
-    if (log.isDebugEnabled()) {
-      log.debug("User info response: {}", response.getBody());
-    }
-
-    JsonElement userJson = JSON.newGson().fromJson(response.getBody(), JsonElement.class);
-    if (!userJson.isJsonObject()) {
-      throw new IOException(String.format("Invalid JSON '%s': not a JSON Object", userJson));
-    }
-    JsonObject jsonObject = userJson.getAsJsonObject();
-
-    JsonElement id = jsonObject.get("id");
-    if (id == null || id.isJsonNull()) {
-      throw new IOException(String.format("CAS response missing id: %s", response.getBody()));
-    }
-
-    JsonElement attrListJson = jsonObject.get("attributes");
-    if (attrListJson == null) {
-      throw new IOException(
-          String.format("CAS response missing attributes: %s", response.getBody()));
-    }
-
-    String email = null, name = null, login = null;
-
-    if (attrListJson.isJsonArray()) {
-      // It is possible for CAS to be configured to not return any attributes (email, name, login),
-      // in which case,
-      // CAS returns an empty JSON object "attributes":{}, rather than "null" or an empty JSON array
-      // "attributes": []
-
-      JsonArray attrJson = attrListJson.getAsJsonArray();
-      for (JsonElement elem : attrJson) {
-        if (elem == null || !elem.isJsonObject()) {
-          throw new IOException(String.format("Invalid JSON '%s': not a JSON Object", elem));
-        }
-        JsonObject obj = elem.getAsJsonObject();
-
-        String property = getStringElement(obj, "email");
-        if (property != null) email = property;
-        property = getStringElement(obj, "name");
-        if (property != null) name = property;
-        property = getStringElement(obj, "login");
-        if (property != null) login = property;
+    try (Response response = service.execute(request)) {
+      if (response.getCode() != HttpServletResponse.SC_OK) {
+        throw new IOException(
+            String.format(
+                "Status %s (%s) for request %s",
+                response.getCode(), response.getBody(), request.getUrl()));
       }
-    }
 
-    return new OAuthUserInfo(
-        CAS_PROVIDER_PREFIX + id.getAsString(),
-        login,
-        email,
-        name,
-        fixLegacyUserId ? id.getAsString() : null);
+      if (log.isDebugEnabled()) {
+        log.debug("User info response: {}", response.getBody());
+      }
+
+      JsonElement userJson = JSON.newGson().fromJson(response.getBody(), JsonElement.class);
+      if (!userJson.isJsonObject()) {
+        throw new IOException(String.format("Invalid JSON '%s': not a JSON Object", userJson));
+      }
+      JsonObject jsonObject = userJson.getAsJsonObject();
+
+      JsonElement id = jsonObject.get("id");
+      if (id == null || id.isJsonNull()) {
+        throw new IOException(String.format("CAS response missing id: %s", response.getBody()));
+      }
+
+      JsonElement attrListJson = jsonObject.get("attributes");
+      if (attrListJson == null) {
+        throw new IOException(
+            String.format("CAS response missing attributes: %s", response.getBody()));
+      }
+
+      String email = null, name = null, login = null;
+      if (attrListJson.isJsonArray()) {
+        // It is possible for CAS to be configured to not return any attributes (email, name,
+        // login),
+        // in which case,
+        // CAS returns an empty JSON object "attributes":{}, rather than "null" or an empty JSON
+        // array
+        // "attributes": []
+
+        JsonArray attrJson = attrListJson.getAsJsonArray();
+        for (JsonElement elem : attrJson) {
+          if (elem == null || !elem.isJsonObject()) {
+            throw new IOException(String.format("Invalid JSON '%s': not a JSON Object", elem));
+          }
+          JsonObject obj = elem.getAsJsonObject();
+
+          String property = getStringElement(obj, "email");
+          if (property != null) email = property;
+          property = getStringElement(obj, "name");
+          if (property != null) name = property;
+          property = getStringElement(obj, "login");
+          if (property != null) login = property;
+        }
+      }
+
+      return new OAuthUserInfo(
+          CAS_PROVIDER_PREFIX + id.getAsString(),
+          login,
+          email,
+          name,
+          fixLegacyUserId ? id.getAsString() : null);
+    } catch (ExecutionException | InterruptedException e) {
+      throw new RuntimeException("Cannot retrieve user info resource", e);
+    }
   }
 
   private String getStringElement(JsonObject o, String name) {
@@ -154,14 +156,20 @@
 
   @Override
   public OAuthToken getAccessToken(OAuthVerifier rv) {
-    Verifier vi = new Verifier(rv.getValue());
-    Token to = service.getAccessToken(null, vi);
-    return new OAuthToken(to.getToken(), to.getSecret(), to.getRawResponse());
+    try {
+      OAuth2AccessToken accessToken = service.getAccessToken(rv.getValue());
+      return new OAuthToken(
+          accessToken.getAccessToken(), accessToken.getTokenType(), accessToken.getRawResponse());
+    } catch (InterruptedException | ExecutionException | IOException e) {
+      String msg = "Cannot retrieve access token";
+      log.error(msg, e);
+      throw new RuntimeException(msg, e);
+    }
   }
 
   @Override
   public String getAuthorizationUrl() {
-    return service.getAuthorizationUrl(null);
+    return service.getAuthorizationUrl();
   }
 
   @Override
diff --git a/src/main/java/com/googlesource/gerrit/plugins/oauth/DexApi.java b/src/main/java/com/googlesource/gerrit/plugins/oauth/DexApi.java
index 2386e24..560aed7 100644
--- a/src/main/java/com/googlesource/gerrit/plugins/oauth/DexApi.java
+++ b/src/main/java/com/googlesource/gerrit/plugins/oauth/DexApi.java
@@ -14,18 +14,16 @@
 
 package com.googlesource.gerrit.plugins.oauth;
 
-import org.scribe.builder.api.DefaultApi20;
-import org.scribe.extractors.AccessTokenExtractor;
-import org.scribe.extractors.JsonTokenExtractor;
-import org.scribe.model.OAuthConfig;
-import org.scribe.model.Verb;
-import org.scribe.oauth.OAuthService;
-import org.scribe.utils.OAuthEncoder;
+import com.github.scribejava.core.builder.api.DefaultApi20;
+import com.github.scribejava.core.extractors.OAuth2AccessTokenExtractor;
+import com.github.scribejava.core.extractors.TokenExtractor;
+import com.github.scribejava.core.model.OAuth2AccessToken;
+import com.github.scribejava.core.oauth2.bearersignature.BearerSignature;
+import com.github.scribejava.core.oauth2.bearersignature.BearerSignatureURIQueryParameter;
 
 public class DexApi extends DefaultApi20 {
 
-  private static final String AUTHORIZE_URL =
-      "%s/dex/auth?client_id=%s&response_type=code&redirect_uri=%s&scope=%s";
+  private static final String AUTHORIZE_URL = "%s/dex/auth";
 
   private final String rootUrl;
 
@@ -34,13 +32,8 @@
   }
 
   @Override
-  public String getAuthorizationUrl(OAuthConfig config) {
-    return String.format(
-        AUTHORIZE_URL,
-        rootUrl,
-        config.getApiKey(),
-        OAuthEncoder.encode(config.getCallback()),
-        config.getScope().replaceAll(" ", "+"));
+  public String getAuthorizationBaseUrl() {
+    return String.format(AUTHORIZE_URL, rootUrl);
   }
 
   @Override
@@ -49,17 +42,12 @@
   }
 
   @Override
-  public Verb getAccessTokenVerb() {
-    return Verb.POST;
+  public BearerSignature getBearerSignature() {
+    return BearerSignatureURIQueryParameter.instance();
   }
 
   @Override
-  public OAuthService createService(OAuthConfig config) {
-    return new OAuth20ServiceImpl(this, config);
-  }
-
-  @Override
-  public AccessTokenExtractor getAccessTokenExtractor() {
-    return new JsonTokenExtractor();
+  public TokenExtractor<OAuth2AccessToken> getAccessTokenExtractor() {
+    return OAuth2AccessTokenExtractor.instance();
   }
 }
diff --git a/src/main/java/com/googlesource/gerrit/plugins/oauth/DexOAuthService.java b/src/main/java/com/googlesource/gerrit/plugins/oauth/DexOAuthService.java
index bf957d4..009ee31 100644
--- a/src/main/java/com/googlesource/gerrit/plugins/oauth/DexOAuthService.java
+++ b/src/main/java/com/googlesource/gerrit/plugins/oauth/DexOAuthService.java
@@ -16,6 +16,9 @@
 
 import static com.google.gerrit.json.OutputFormat.JSON;
 
+import com.github.scribejava.core.builder.ServiceBuilder;
+import com.github.scribejava.core.model.OAuth2AccessToken;
+import com.github.scribejava.core.oauth.OAuth20Service;
 import com.google.common.base.CharMatcher;
 import com.google.common.base.Preconditions;
 import com.google.gerrit.extensions.annotations.PluginName;
@@ -34,18 +37,18 @@
 import com.google.inject.Singleton;
 import java.io.IOException;
 import java.net.URI;
+import java.util.concurrent.ExecutionException;
 import org.apache.commons.codec.binary.Base64;
-import org.scribe.builder.ServiceBuilder;
-import org.scribe.model.Token;
-import org.scribe.model.Verifier;
-import org.scribe.oauth.OAuthService;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
 
 @Singleton
 public class DexOAuthService implements OAuthServiceProvider {
+  private static final Logger log = LoggerFactory.getLogger(DexOAuthService.class);
 
   static final String CONFIG_SUFFIX = "-dex-oauth";
   private static final String DEX_PROVIDER_PREFIX = "dex-oauth:";
-  private final OAuthService service;
+  private final OAuth20Service service;
   private final String rootUrl;
   private final String domain;
   private final String serviceName;
@@ -66,13 +69,11 @@
     serviceName = cfg.getString(InitOAuth.SERVICE_NAME, "Dex OAuth2");
 
     service =
-        new ServiceBuilder()
-            .provider(new DexApi(rootUrl))
-            .apiKey(cfg.getString(InitOAuth.CLIENT_ID))
+        new ServiceBuilder(cfg.getString(InitOAuth.CLIENT_ID))
             .apiSecret(cfg.getString(InitOAuth.CLIENT_SECRET))
-            .scope("openid profile email offline_access")
+            .defaultScope("openid profile email offline_access")
             .callback(canonicalWebUrl + "oauth")
-            .build();
+            .build(new DexApi(rootUrl));
   }
 
   private String parseJwt(String input) {
@@ -120,14 +121,20 @@
 
   @Override
   public OAuthToken getAccessToken(OAuthVerifier rv) {
-    Verifier vi = new Verifier(rv.getValue());
-    Token to = service.getAccessToken(null, vi);
-    return new OAuthToken(to.getToken(), to.getSecret(), to.getRawResponse());
+    try {
+      OAuth2AccessToken accessToken = service.getAccessToken(rv.getValue());
+      return new OAuthToken(
+          accessToken.getAccessToken(), accessToken.getTokenType(), accessToken.getRawResponse());
+    } catch (InterruptedException | ExecutionException | IOException e) {
+      String msg = "Cannot retrieve access token";
+      log.error(msg, e);
+      throw new RuntimeException(msg, e);
+    }
   }
 
   @Override
   public String getAuthorizationUrl() {
-    return service.getAuthorizationUrl(null);
+    return service.getAuthorizationUrl();
   }
 
   @Override
diff --git a/src/main/java/com/googlesource/gerrit/plugins/oauth/Facebook2Api.java b/src/main/java/com/googlesource/gerrit/plugins/oauth/Facebook2Api.java
index a547bfb..96f4636 100644
--- a/src/main/java/com/googlesource/gerrit/plugins/oauth/Facebook2Api.java
+++ b/src/main/java/com/googlesource/gerrit/plugins/oauth/Facebook2Api.java
@@ -14,12 +14,23 @@
 
 package com.googlesource.gerrit.plugins.oauth;
 
-import org.scribe.builder.api.FacebookApi;
-import org.scribe.extractors.AccessTokenExtractor;
+import com.github.scribejava.core.builder.api.DefaultApi20;
+import com.github.scribejava.core.oauth2.clientauthentication.ClientAuthentication;
+import com.github.scribejava.core.oauth2.clientauthentication.RequestBodyAuthenticationScheme;
 
-public class Facebook2Api extends FacebookApi {
+public class Facebook2Api extends DefaultApi20 {
   @Override
-  public AccessTokenExtractor getAccessTokenExtractor() {
-    return OAuth2AccessTokenJsonExtractor.instance();
+  protected String getAuthorizationBaseUrl() {
+    return "https://www.facebook.com/dialog/oauth";
+  }
+
+  @Override
+  public String getAccessTokenEndpoint() {
+    return "https://graph.facebook.com/oauth/access_token";
+  }
+
+  @Override
+  public ClientAuthentication getClientAuthentication() {
+    return RequestBodyAuthenticationScheme.instance();
   }
 }
diff --git a/src/main/java/com/googlesource/gerrit/plugins/oauth/FacebookOAuthService.java b/src/main/java/com/googlesource/gerrit/plugins/oauth/FacebookOAuthService.java
index bc5818a..7682410 100644
--- a/src/main/java/com/googlesource/gerrit/plugins/oauth/FacebookOAuthService.java
+++ b/src/main/java/com/googlesource/gerrit/plugins/oauth/FacebookOAuthService.java
@@ -16,6 +16,12 @@
 
 import static com.google.gerrit.json.OutputFormat.JSON;
 
+import com.github.scribejava.core.builder.ServiceBuilder;
+import com.github.scribejava.core.model.OAuth2AccessToken;
+import com.github.scribejava.core.model.OAuthRequest;
+import com.github.scribejava.core.model.Response;
+import com.github.scribejava.core.model.Verb;
+import com.github.scribejava.core.oauth.OAuth20Service;
 import com.google.common.base.CharMatcher;
 import com.google.gerrit.extensions.annotations.PluginName;
 import com.google.gerrit.extensions.auth.oauth.OAuthServiceProvider;
@@ -31,14 +37,8 @@
 import com.google.inject.Provider;
 import com.google.inject.Singleton;
 import java.io.IOException;
+import java.util.concurrent.ExecutionException;
 import javax.servlet.http.HttpServletResponse;
-import org.scribe.builder.ServiceBuilder;
-import org.scribe.model.OAuthRequest;
-import org.scribe.model.Response;
-import org.scribe.model.Token;
-import org.scribe.model.Verb;
-import org.scribe.model.Verifier;
-import org.scribe.oauth.OAuthService;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
@@ -52,7 +52,7 @@
   private static final String SCOPE = "email";
   private static final String FIELDS_QUERY = "fields";
   private static final String FIELDS = "email,name";
-  private final OAuthService service;
+  private final OAuth20Service service;
 
   @Inject
   FacebookOAuthService(
@@ -64,53 +64,55 @@
     String canonicalWebUrl = CharMatcher.is('/').trimTrailingFrom(urlProvider.get()) + "/";
 
     service =
-        new ServiceBuilder()
-            .provider(Facebook2Api.class)
-            .apiKey(cfg.getString(InitOAuth.CLIENT_ID))
+        new ServiceBuilder(cfg.getString(InitOAuth.CLIENT_ID))
             .apiSecret(cfg.getString(InitOAuth.CLIENT_SECRET))
             .callback(canonicalWebUrl + "oauth")
-            .scope(SCOPE)
-            .build();
+            .defaultScope(SCOPE)
+            .build(new Facebook2Api());
   }
 
   @Override
   public OAuthUserInfo getUserInfo(OAuthToken token) throws IOException {
     OAuthRequest request = new OAuthRequest(Verb.GET, PROTECTED_RESOURCE_URL);
-    Token t = new Token(token.getToken(), token.getSecret(), token.getRaw());
     request.addQuerystringParameter(FIELDS_QUERY, FIELDS);
+    OAuth2AccessToken t = new OAuth2AccessToken(token.getToken(), token.getRaw());
     service.signRequest(t, request);
-    Response response = request.send();
 
-    if (response.getCode() != HttpServletResponse.SC_OK) {
-      throw new IOException(
-          String.format(
-              "Status %s (%s) for request %s",
-              response.getCode(), response.getBody(), request.getUrl()));
-    }
-    JsonElement userJson = JSON.newGson().fromJson(response.getBody(), JsonElement.class);
-
-    if (log.isDebugEnabled()) {
-      log.debug("User info response: {}", response.getBody());
-    }
-    if (userJson.isJsonObject()) {
-      JsonObject jsonObject = userJson.getAsJsonObject();
-      JsonElement id = jsonObject.get("id");
-      if (id == null || id.isJsonNull()) {
-        throw new IOException("Response doesn't contain id field");
+    JsonElement userJson = null;
+    try (Response response = service.execute(request)) {
+      if (response.getCode() != HttpServletResponse.SC_OK) {
+        throw new IOException(
+            String.format(
+                "Status %s (%s) for request %s",
+                response.getCode(), response.getBody(), request.getUrl()));
       }
-      JsonElement email = jsonObject.get("email");
-      JsonElement name = jsonObject.get("name");
-      // Heads up!
-      // Lets keep `login` equal to `email`, since `username` field is
-      // deprecated for Facebook API versions v2.0 and higher
-      JsonElement login = jsonObject.get("email");
+      userJson = JSON.newGson().fromJson(response.getBody(), JsonElement.class);
 
-      return new OAuthUserInfo(
-          FACEBOOK_PROVIDER_PREFIX + id.getAsString(),
-          login == null || login.isJsonNull() ? null : login.getAsString(),
-          email == null || email.isJsonNull() ? null : email.getAsString(),
-          name == null || name.isJsonNull() ? null : name.getAsString(),
-          null);
+      if (log.isDebugEnabled()) {
+        log.debug("User info response: {}", response.getBody());
+      }
+      if (userJson.isJsonObject()) {
+        JsonObject jsonObject = userJson.getAsJsonObject();
+        JsonElement id = jsonObject.get("id");
+        if (id == null || id.isJsonNull()) {
+          throw new IOException("Response doesn't contain id field");
+        }
+        JsonElement email = jsonObject.get("email");
+        JsonElement name = jsonObject.get("name");
+        // Heads up!
+        // Lets keep `login` equal to `email`, since `username` field is
+        // deprecated for Facebook API versions v2.0 and higher
+        JsonElement login = jsonObject.get("email");
+
+        return new OAuthUserInfo(
+            FACEBOOK_PROVIDER_PREFIX + id.getAsString(),
+            login == null || login.isJsonNull() ? null : login.getAsString(),
+            email == null || email.isJsonNull() ? null : email.getAsString(),
+            name == null || name.isJsonNull() ? null : name.getAsString(),
+            null);
+      }
+    } catch (ExecutionException | InterruptedException e) {
+      throw new RuntimeException("Cannot retrieve user info resource", e);
     }
 
     throw new IOException(String.format("Invalid JSON '%s': not a JSON Object", userJson));
@@ -118,16 +120,20 @@
 
   @Override
   public OAuthToken getAccessToken(OAuthVerifier rv) {
-    Verifier vi = new Verifier(rv.getValue());
-    Token to = service.getAccessToken(null, vi);
-    OAuthToken result = new OAuthToken(to.getToken(), to.getSecret(), to.getRawResponse());
-
-    return result;
+    try {
+      OAuth2AccessToken accessToken = service.getAccessToken(rv.getValue());
+      return new OAuthToken(
+          accessToken.getAccessToken(), accessToken.getTokenType(), accessToken.getRawResponse());
+    } catch (InterruptedException | ExecutionException | IOException e) {
+      String msg = "Cannot retrieve access token";
+      log.error(msg, e);
+      throw new RuntimeException(msg, e);
+    }
   }
 
   @Override
   public String getAuthorizationUrl() {
-    return service.getAuthorizationUrl(null);
+    return service.getAuthorizationUrl();
   }
 
   @Override
diff --git a/src/main/java/com/googlesource/gerrit/plugins/oauth/GitHub2Api.java b/src/main/java/com/googlesource/gerrit/plugins/oauth/GitHub2Api.java
index 4b8419b..477eadf 100644
--- a/src/main/java/com/googlesource/gerrit/plugins/oauth/GitHub2Api.java
+++ b/src/main/java/com/googlesource/gerrit/plugins/oauth/GitHub2Api.java
@@ -14,22 +14,32 @@
 
 package com.googlesource.gerrit.plugins.oauth;
 
-import org.scribe.builder.api.DefaultApi20;
-import org.scribe.model.OAuthConfig;
-import org.scribe.utils.OAuthEncoder;
+import com.github.scribejava.core.builder.api.DefaultApi20;
+import com.github.scribejava.core.extractors.OAuth2AccessTokenExtractor;
+import com.github.scribejava.core.extractors.TokenExtractor;
+import com.github.scribejava.core.model.OAuth2AccessToken;
 
 public class GitHub2Api extends DefaultApi20 {
-  private static final String AUTHORIZE_URL =
-      "https://github.com/login/oauth/authorize?client_id=%s&redirect_uri=%s";
+  private static final String AUTHORIZE_URL = "%slogin/oauth/authorize";
 
-  @Override
-  public String getAccessTokenEndpoint() {
-    return "https://github.com/login/oauth/access_token";
+  private final String rootUrl;
+
+  public GitHub2Api(String rootUrl) {
+    this.rootUrl = rootUrl;
   }
 
   @Override
-  public String getAuthorizationUrl(OAuthConfig config) {
-    return String.format(
-        AUTHORIZE_URL, config.getApiKey(), OAuthEncoder.encode(config.getCallback()));
+  public String getAccessTokenEndpoint() {
+    return String.format("%slogin/oauth/access_token", rootUrl);
+  }
+
+  @Override
+  protected String getAuthorizationBaseUrl() {
+    return String.format(AUTHORIZE_URL, rootUrl);
+  }
+
+  @Override
+  public TokenExtractor<OAuth2AccessToken> getAccessTokenExtractor() {
+    return OAuth2AccessTokenExtractor.instance();
   }
 }
diff --git a/src/main/java/com/googlesource/gerrit/plugins/oauth/GitHubOAuthService.java b/src/main/java/com/googlesource/gerrit/plugins/oauth/GitHubOAuthService.java
index 1c73c0e..12643b2 100644
--- a/src/main/java/com/googlesource/gerrit/plugins/oauth/GitHubOAuthService.java
+++ b/src/main/java/com/googlesource/gerrit/plugins/oauth/GitHubOAuthService.java
@@ -16,6 +16,12 @@
 
 import static com.google.gerrit.json.OutputFormat.JSON;
 
+import com.github.scribejava.core.builder.ServiceBuilder;
+import com.github.scribejava.core.model.OAuth2AccessToken;
+import com.github.scribejava.core.model.OAuthRequest;
+import com.github.scribejava.core.model.Response;
+import com.github.scribejava.core.model.Verb;
+import com.github.scribejava.core.oauth.OAuth20Service;
 import com.google.common.base.CharMatcher;
 import com.google.gerrit.extensions.annotations.PluginName;
 import com.google.gerrit.extensions.auth.oauth.OAuthServiceProvider;
@@ -31,14 +37,8 @@
 import com.google.inject.Provider;
 import com.google.inject.Singleton;
 import java.io.IOException;
+import java.util.concurrent.ExecutionException;
 import javax.servlet.http.HttpServletResponse;
-import org.scribe.builder.ServiceBuilder;
-import org.scribe.model.OAuthRequest;
-import org.scribe.model.Response;
-import org.scribe.model.Token;
-import org.scribe.model.Verb;
-import org.scribe.model.Verifier;
-import org.scribe.oauth.OAuthService;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
@@ -47,11 +47,14 @@
   private static final Logger log = LoggerFactory.getLogger(GitHubOAuthService.class);
   static final String CONFIG_SUFFIX = "-github-oauth";
   private static final String GITHUB_PROVIDER_PREFIX = "github-oauth:";
-  private static final String PROTECTED_RESOURCE_URL = "https://api.github.com/user";
+  private static final String GITHUB_API_ENDPOINT_URL = "https://api.github.com/";
+  private static final String GHE_API_ENDPOINT_URL = "%sapi/v3/";
+  static final String GITHUB_ROOT_URL = "https://github.com/";
+  private final String rootUrl;
 
-  private static final String SCOPE = "user:email";
+  static final String SCOPE = "user:email";
   private final boolean fixLegacyUserId;
-  private final OAuthService service;
+  private final OAuth20Service service;
 
   @Inject
   GitHubOAuthService(
@@ -61,47 +64,64 @@
     PluginConfig cfg = cfgFactory.getFromGerritConfig(pluginName + CONFIG_SUFFIX);
     String canonicalWebUrl = CharMatcher.is('/').trimTrailingFrom(urlProvider.get()) + "/";
     fixLegacyUserId = cfg.getBoolean(InitOAuth.FIX_LEGACY_USER_ID, false);
+    rootUrl =
+        CharMatcher.is('/').trimTrailingFrom(cfg.getString(InitOAuth.ROOT_URL, GITHUB_ROOT_URL))
+            + "/";
+
     service =
-        new ServiceBuilder()
-            .provider(GitHub2Api.class)
-            .apiKey(cfg.getString(InitOAuth.CLIENT_ID))
+        new ServiceBuilder(cfg.getString(InitOAuth.CLIENT_ID))
             .apiSecret(cfg.getString(InitOAuth.CLIENT_SECRET))
             .callback(canonicalWebUrl + "oauth")
-            .scope(SCOPE)
-            .build();
+            .defaultScope(SCOPE)
+            .build(new GitHub2Api(rootUrl));
+  }
+
+  private String getApiUrl() {
+    return GITHUB_ROOT_URL.equals(rootUrl)
+        ? GITHUB_API_ENDPOINT_URL
+        : String.format(GHE_API_ENDPOINT_URL, rootUrl);
+  }
+
+  private String getProtectedResourceUrl() {
+    return getApiUrl() + "user";
   }
 
   @Override
   public OAuthUserInfo getUserInfo(OAuthToken token) throws IOException {
-    OAuthRequest request = new OAuthRequest(Verb.GET, PROTECTED_RESOURCE_URL);
-    Token t = new Token(token.getToken(), token.getSecret(), token.getRaw());
+    OAuthRequest request = new OAuthRequest(Verb.GET, getProtectedResourceUrl());
+    OAuth2AccessToken t = new OAuth2AccessToken(token.getToken(), token.getRaw());
     service.signRequest(t, request);
-    Response response = request.send();
-    if (response.getCode() != HttpServletResponse.SC_OK) {
-      throw new IOException(
-          String.format(
-              "Status %s (%s) for request %s",
-              response.getCode(), response.getBody(), request.getUrl()));
-    }
-    JsonElement userJson = JSON.newGson().fromJson(response.getBody(), JsonElement.class);
-    if (log.isDebugEnabled()) {
-      log.debug("User info response: {}", response.getBody());
-    }
-    if (userJson.isJsonObject()) {
-      JsonObject jsonObject = userJson.getAsJsonObject();
-      JsonElement id = jsonObject.get("id");
-      if (id == null || id.isJsonNull()) {
-        throw new IOException("Response doesn't contain id field");
+
+    JsonElement userJson = null;
+    try (Response response = service.execute(request)) {
+      if (response.getCode() != HttpServletResponse.SC_OK) {
+        throw new IOException(
+            String.format(
+                "Status %s (%s) for request %s",
+                response.getCode(), response.getBody(), request.getUrl()));
       }
-      JsonElement email = jsonObject.get("email");
-      JsonElement name = jsonObject.get("name");
-      JsonElement login = jsonObject.get("login");
-      return new OAuthUserInfo(
-          GITHUB_PROVIDER_PREFIX + id.getAsString(),
-          login == null || login.isJsonNull() ? null : login.getAsString(),
-          email == null || email.isJsonNull() ? null : email.getAsString(),
-          name == null || name.isJsonNull() ? null : name.getAsString(),
-          fixLegacyUserId ? id.getAsString() : null);
+      userJson = JSON.newGson().fromJson(response.getBody(), JsonElement.class);
+      if (log.isDebugEnabled()) {
+        log.debug("User info response: {}", response.getBody());
+      }
+      if (userJson.isJsonObject()) {
+        JsonObject jsonObject = userJson.getAsJsonObject();
+        JsonElement id = jsonObject.get("id");
+        if (id == null || id.isJsonNull()) {
+          throw new IOException("Response doesn't contain id field");
+        }
+        JsonElement email = jsonObject.get("email");
+        JsonElement name = jsonObject.get("name");
+        JsonElement login = jsonObject.get("login");
+        return new OAuthUserInfo(
+            GITHUB_PROVIDER_PREFIX + id.getAsString(),
+            login == null || login.isJsonNull() ? null : login.getAsString(),
+            email == null || email.isJsonNull() ? null : email.getAsString(),
+            name == null || name.isJsonNull() ? null : name.getAsString(),
+            fixLegacyUserId ? id.getAsString() : null);
+      }
+    } catch (ExecutionException | InterruptedException e) {
+      throw new RuntimeException("Cannot retrieve user info resource", e);
     }
 
     throw new IOException(String.format("Invalid JSON '%s': not a JSON Object", userJson));
@@ -109,15 +129,20 @@
 
   @Override
   public OAuthToken getAccessToken(OAuthVerifier rv) {
-    Verifier vi = new Verifier(rv.getValue());
-    Token to = service.getAccessToken(null, vi);
-    OAuthToken result = new OAuthToken(to.getToken(), to.getSecret(), to.getRawResponse());
-    return result;
+    try {
+      OAuth2AccessToken accessToken = service.getAccessToken(rv.getValue());
+      return new OAuthToken(
+          accessToken.getAccessToken(), accessToken.getTokenType(), accessToken.getRawResponse());
+    } catch (InterruptedException | ExecutionException | IOException e) {
+      String msg = "Cannot retrieve access token";
+      log.error(msg, e);
+      throw new RuntimeException(msg, e);
+    }
   }
 
   @Override
   public String getAuthorizationUrl() {
-    return service.getAuthorizationUrl(null);
+    return service.getAuthorizationUrl();
   }
 
   @Override
diff --git a/src/main/java/com/googlesource/gerrit/plugins/oauth/GitLabApi.java b/src/main/java/com/googlesource/gerrit/plugins/oauth/GitLabApi.java
index db0851f..ca88d05 100644
--- a/src/main/java/com/googlesource/gerrit/plugins/oauth/GitLabApi.java
+++ b/src/main/java/com/googlesource/gerrit/plugins/oauth/GitLabApi.java
@@ -14,15 +14,12 @@
 
 package com.googlesource.gerrit.plugins.oauth;
 
-import org.scribe.builder.api.DefaultApi20;
-import org.scribe.extractors.AccessTokenExtractor;
-import org.scribe.model.OAuthConfig;
-import org.scribe.model.Verb;
-import org.scribe.oauth.OAuthService;
+import com.github.scribejava.core.builder.api.DefaultApi20;
+import com.github.scribejava.core.oauth2.clientauthentication.ClientAuthentication;
+import com.github.scribejava.core.oauth2.clientauthentication.RequestBodyAuthenticationScheme;
 
 public class GitLabApi extends DefaultApi20 {
-  private static final String AUTHORIZE_URL =
-      "%s/oauth/authorize?client_id=%s&response_type=code&redirect_uri=%s";
+  private static final String AUTHORIZE_URL = "%s/oauth/authorize";
 
   private final String rootUrl;
 
@@ -31,8 +28,8 @@
   }
 
   @Override
-  public String getAuthorizationUrl(OAuthConfig config) {
-    return String.format(AUTHORIZE_URL, rootUrl, config.getApiKey(), config.getCallback());
+  public String getAuthorizationBaseUrl() {
+    return String.format(AUTHORIZE_URL, rootUrl);
   }
 
   @Override
@@ -41,17 +38,7 @@
   }
 
   @Override
-  public Verb getAccessTokenVerb() {
-    return Verb.POST;
-  }
-
-  @Override
-  public OAuthService createService(OAuthConfig config) {
-    return new OAuth20ServiceImpl(this, config);
-  }
-
-  @Override
-  public AccessTokenExtractor getAccessTokenExtractor() {
-    return OAuth2AccessTokenJsonExtractor.instance();
+  public ClientAuthentication getClientAuthentication() {
+    return RequestBodyAuthenticationScheme.instance();
   }
 }
diff --git a/src/main/java/com/googlesource/gerrit/plugins/oauth/GitLabOAuthService.java b/src/main/java/com/googlesource/gerrit/plugins/oauth/GitLabOAuthService.java
index 52f2102..57eb94b 100644
--- a/src/main/java/com/googlesource/gerrit/plugins/oauth/GitLabOAuthService.java
+++ b/src/main/java/com/googlesource/gerrit/plugins/oauth/GitLabOAuthService.java
@@ -18,6 +18,12 @@
 import static javax.servlet.http.HttpServletResponse.SC_OK;
 import static org.slf4j.LoggerFactory.getLogger;
 
+import com.github.scribejava.core.builder.ServiceBuilder;
+import com.github.scribejava.core.model.OAuth2AccessToken;
+import com.github.scribejava.core.model.OAuthRequest;
+import com.github.scribejava.core.model.Response;
+import com.github.scribejava.core.model.Verb;
+import com.github.scribejava.core.oauth.OAuth20Service;
 import com.google.common.base.CharMatcher;
 import com.google.gerrit.extensions.annotations.PluginName;
 import com.google.gerrit.extensions.auth.oauth.OAuthServiceProvider;
@@ -35,13 +41,7 @@
 import com.google.inject.Singleton;
 import java.io.IOException;
 import java.net.URI;
-import org.scribe.builder.ServiceBuilder;
-import org.scribe.model.OAuthRequest;
-import org.scribe.model.Response;
-import org.scribe.model.Token;
-import org.scribe.model.Verb;
-import org.scribe.model.Verifier;
-import org.scribe.oauth.OAuthService;
+import java.util.concurrent.ExecutionException;
 import org.slf4j.Logger;
 
 @Singleton
@@ -50,7 +50,7 @@
   static final String CONFIG_SUFFIX = "-gitlab-oauth";
   private static final String PROTECTED_RESOURCE_URL = "%s/api/v3/user";
   private static final String GITLAB_PROVIDER_PREFIX = "gitlab-oauth:";
-  private final OAuthService service;
+  private final OAuth20Service service;
   private final String rootUrl;
 
   @Inject
@@ -65,58 +65,65 @@
       throw new ProvisionException("Root URL must be absolute URL");
     }
     service =
-        new ServiceBuilder()
-            .provider(new GitLabApi(rootUrl))
-            .apiKey(cfg.getString(InitOAuth.CLIENT_ID))
+        new ServiceBuilder(cfg.getString(InitOAuth.CLIENT_ID))
             .apiSecret(cfg.getString(InitOAuth.CLIENT_SECRET))
             .callback(canonicalWebUrl + "oauth")
-            .build();
+            .build(new GitLabApi(rootUrl));
   }
 
   @Override
   public OAuthUserInfo getUserInfo(OAuthToken token) throws IOException {
-    final String protectedResourceUrl = String.format(PROTECTED_RESOURCE_URL, rootUrl);
-    OAuthRequest request = new OAuthRequest(Verb.GET, protectedResourceUrl);
-    Token t = new Token(token.getToken(), token.getSecret(), token.getRaw());
+    OAuthRequest request =
+        new OAuthRequest(Verb.GET, String.format(PROTECTED_RESOURCE_URL, rootUrl));
+    OAuth2AccessToken t = new OAuth2AccessToken(token.getToken(), token.getRaw());
     service.signRequest(t, request);
 
-    Response response = request.send();
-    if (response.getCode() != SC_OK) {
-      throw new IOException(
-          String.format(
-              "Status %s (%s) for request %s",
-              response.getCode(), response.getBody(), request.getUrl()));
+    try (Response response = service.execute(request)) {
+      if (response.getCode() != SC_OK) {
+        throw new IOException(
+            String.format(
+                "Status %s (%s) for request %s",
+                response.getCode(), response.getBody(), request.getUrl()));
+      }
+      JsonElement userJson = JSON.newGson().fromJson(response.getBody(), JsonElement.class);
+      if (log.isDebugEnabled()) {
+        log.debug("User info response: {}", response.getBody());
+      }
+      JsonObject jsonObject = userJson.getAsJsonObject();
+      if (jsonObject == null || jsonObject.isJsonNull()) {
+        throw new IOException("Response doesn't contain 'user' field" + jsonObject);
+      }
+      JsonElement id = jsonObject.get("id");
+      JsonElement username = jsonObject.get("username");
+      JsonElement email = jsonObject.get("email");
+      JsonElement name = jsonObject.get("name");
+      return new OAuthUserInfo(
+          GITLAB_PROVIDER_PREFIX + id.getAsString(),
+          username == null || username.isJsonNull() ? null : username.getAsString(),
+          email == null || email.isJsonNull() ? null : email.getAsString(),
+          name == null || name.isJsonNull() ? null : name.getAsString(),
+          null);
+    } catch (ExecutionException | InterruptedException e) {
+      throw new RuntimeException("Cannot retrieve user info resource", e);
     }
-    JsonElement userJson = JSON.newGson().fromJson(response.getBody(), JsonElement.class);
-    if (log.isDebugEnabled()) {
-      log.debug("User info response: {}", response.getBody());
-    }
-    JsonObject jsonObject = userJson.getAsJsonObject();
-    if (jsonObject == null || jsonObject.isJsonNull()) {
-      throw new IOException("Response doesn't contain 'user' field" + jsonObject);
-    }
-    JsonElement id = jsonObject.get("id");
-    JsonElement username = jsonObject.get("username");
-    JsonElement email = jsonObject.get("email");
-    JsonElement name = jsonObject.get("name");
-    return new OAuthUserInfo(
-        GITLAB_PROVIDER_PREFIX + id.getAsString(),
-        username == null || username.isJsonNull() ? null : username.getAsString(),
-        email == null || email.isJsonNull() ? null : email.getAsString(),
-        name == null || name.isJsonNull() ? null : name.getAsString(),
-        null);
   }
 
   @Override
   public OAuthToken getAccessToken(OAuthVerifier rv) {
-    Verifier vi = new Verifier(rv.getValue());
-    Token to = service.getAccessToken(null, vi);
-    return new OAuthToken(to.getToken(), to.getSecret(), to.getRawResponse());
+    try {
+      OAuth2AccessToken accessToken = service.getAccessToken(rv.getValue());
+      return new OAuthToken(
+          accessToken.getAccessToken(), accessToken.getTokenType(), accessToken.getRawResponse());
+    } catch (InterruptedException | ExecutionException | IOException e) {
+      String msg = "Cannot retrieve access token";
+      log.error(msg, e);
+      throw new RuntimeException(msg, e);
+    }
   }
 
   @Override
   public String getAuthorizationUrl() {
-    return service.getAuthorizationUrl(null);
+    return service.getAuthorizationUrl();
   }
 
   @Override
diff --git a/src/main/java/com/googlesource/gerrit/plugins/oauth/Google2Api.java b/src/main/java/com/googlesource/gerrit/plugins/oauth/Google2Api.java
index 88c640d..4f2eed2 100644
--- a/src/main/java/com/googlesource/gerrit/plugins/oauth/Google2Api.java
+++ b/src/main/java/com/googlesource/gerrit/plugins/oauth/Google2Api.java
@@ -14,50 +14,16 @@
 
 package com.googlesource.gerrit.plugins.oauth;
 
-import static org.scribe.utils.OAuthEncoder.encode;
+import com.github.scribejava.core.builder.api.DefaultApi20;
 
-import org.scribe.builder.api.DefaultApi20;
-import org.scribe.extractors.AccessTokenExtractor;
-import org.scribe.model.OAuthConfig;
-import org.scribe.model.Verb;
-import org.scribe.oauth.OAuthService;
-import org.scribe.utils.Preconditions;
-
-// Source: https://github.com/FeedTheCoffers/scribe-java-extras
-// License: Apache 2
-// https://github.com/FeedTheCoffers/scribe-java-extras/blob/master/pom.xml
 public class Google2Api extends DefaultApi20 {
-  private static final String AUTHORIZE_URL =
-      "https://accounts.google.com/o/oauth2/auth?response_type=code&client_id=%s&redirect_uri=%s&scope=%s";
-
   @Override
   public String getAccessTokenEndpoint() {
-    return "https://accounts.google.com/o/oauth2/token";
+    return "https://www.googleapis.com/oauth2/v4/token";
   }
 
   @Override
-  public String getAuthorizationUrl(OAuthConfig config) {
-    Preconditions.checkValidUrl(
-        config.getCallback(), "Must provide a valid url as callback. Google does not support OOB");
-    Preconditions.checkEmptyString(
-        config.getScope(), "Must provide a valid value as scope. Google does not support no scope");
-
-    return String.format(
-        AUTHORIZE_URL, config.getApiKey(), encode(config.getCallback()), encode(config.getScope()));
-  }
-
-  @Override
-  public Verb getAccessTokenVerb() {
-    return Verb.POST;
-  }
-
-  @Override
-  public OAuthService createService(OAuthConfig config) {
-    return new OAuth20ServiceImpl(this, config);
-  }
-
-  @Override
-  public AccessTokenExtractor getAccessTokenExtractor() {
-    return OAuth2AccessTokenJsonExtractor.instance();
+  public String getAuthorizationBaseUrl() {
+    return "https://accounts.google.com/o/oauth2/auth";
   }
 }
diff --git a/src/main/java/com/googlesource/gerrit/plugins/oauth/GoogleOAuthService.java b/src/main/java/com/googlesource/gerrit/plugins/oauth/GoogleOAuthService.java
index d6fcacf..b63ba33 100644
--- a/src/main/java/com/googlesource/gerrit/plugins/oauth/GoogleOAuthService.java
+++ b/src/main/java/com/googlesource/gerrit/plugins/oauth/GoogleOAuthService.java
@@ -16,6 +16,12 @@
 
 import static com.google.gerrit.json.OutputFormat.JSON;
 
+import com.github.scribejava.core.builder.ServiceBuilder;
+import com.github.scribejava.core.model.OAuth2AccessToken;
+import com.github.scribejava.core.model.OAuthRequest;
+import com.github.scribejava.core.model.Response;
+import com.github.scribejava.core.model.Verb;
+import com.github.scribejava.core.oauth.OAuth20Service;
 import com.google.common.base.CharMatcher;
 import com.google.common.base.Preconditions;
 import com.google.common.base.Strings;
@@ -38,15 +44,9 @@
 import java.nio.charset.StandardCharsets;
 import java.util.Arrays;
 import java.util.List;
+import java.util.concurrent.ExecutionException;
 import javax.servlet.http.HttpServletResponse;
 import org.apache.commons.codec.binary.Base64;
-import org.scribe.builder.ServiceBuilder;
-import org.scribe.model.OAuthRequest;
-import org.scribe.model.Response;
-import org.scribe.model.Token;
-import org.scribe.model.Verb;
-import org.scribe.model.Verifier;
-import org.scribe.oauth.OAuthService;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
@@ -58,7 +58,7 @@
   private static final String PROTECTED_RESOURCE_URL =
       "https://www.googleapis.com/oauth2/v2/userinfo";
   private static final String SCOPE = "email profile";
-  private final OAuthService service;
+  private final OAuth20Service service;
   private final String canonicalWebUrl;
   private final List<String> domains;
   private final boolean useEmailAsUsername;
@@ -80,13 +80,11 @@
     this.domains = Arrays.asList(cfg.getStringList(InitOAuth.DOMAIN));
     this.useEmailAsUsername = cfg.getBoolean(InitOAuth.USE_EMAIL_AS_USERNAME, false);
     this.service =
-        new ServiceBuilder()
-            .provider(Google2Api.class)
-            .apiKey(cfg.getString(InitOAuth.CLIENT_ID))
+        new ServiceBuilder(cfg.getString(InitOAuth.CLIENT_ID))
             .apiSecret(cfg.getString(InitOAuth.CLIENT_SECRET))
             .callback(canonicalWebUrl + "oauth")
-            .scope(SCOPE)
-            .build();
+            .defaultScope(SCOPE)
+            .build(new Google2Api());
     if (log.isDebugEnabled()) {
       log.debug("OAuth2: canonicalWebUrl={}", canonicalWebUrl);
       log.debug("OAuth2: scope={}", SCOPE);
@@ -98,54 +96,59 @@
   @Override
   public OAuthUserInfo getUserInfo(OAuthToken token) throws IOException {
     OAuthRequest request = new OAuthRequest(Verb.GET, PROTECTED_RESOURCE_URL);
-    Token t = new Token(token.getToken(), token.getSecret(), token.getRaw());
+    OAuth2AccessToken t = new OAuth2AccessToken(token.getToken(), token.getRaw());
     service.signRequest(t, request);
-    Response response = request.send();
-    if (response.getCode() != HttpServletResponse.SC_OK) {
-      throw new IOException(
-          String.format(
-              "Status %s (%s) for request %s",
-              response.getCode(), response.getBody(), request.getUrl()));
-    }
-    JsonElement userJson = JSON.newGson().fromJson(response.getBody(), JsonElement.class);
-    if (log.isDebugEnabled()) {
-      log.debug("User info response: {}", response.getBody());
-    }
-    if (userJson.isJsonObject()) {
-      JsonObject jsonObject = userJson.getAsJsonObject();
-      JsonElement id = jsonObject.get("id");
-      if (id == null || id.isJsonNull()) {
-        throw new IOException("Response doesn't contain id field");
-      }
-      JsonElement email = jsonObject.get("email");
-      JsonElement name = jsonObject.get("name");
-      String login = null;
 
-      if (domains.size() > 0) {
-        boolean domainMatched = false;
-        JsonObject jwtToken = retrieveJWTToken(token);
-        String hdClaim = retrieveHostedDomain(jwtToken);
-        for (String domain : domains) {
-          if (domain.equalsIgnoreCase(hdClaim)) {
-            domainMatched = true;
-            break;
+    JsonElement userJson = null;
+    try (Response response = service.execute(request)) {
+      if (response.getCode() != HttpServletResponse.SC_OK) {
+        throw new IOException(
+            String.format(
+                "Status %s (%s) for request %s",
+                response.getCode(), response.getBody(), request.getUrl()));
+      }
+      userJson = JSON.newGson().fromJson(response.getBody(), JsonElement.class);
+      if (log.isDebugEnabled()) {
+        log.debug("User info response: {}", response.getBody());
+      }
+      if (userJson.isJsonObject()) {
+        JsonObject jsonObject = userJson.getAsJsonObject();
+        JsonElement id = jsonObject.get("id");
+        if (id == null || id.isJsonNull()) {
+          throw new IOException("Response doesn't contain id field");
+        }
+        JsonElement email = jsonObject.get("email");
+        JsonElement name = jsonObject.get("name");
+        String login = null;
+
+        if (domains.size() > 0) {
+          boolean domainMatched = false;
+          JsonObject jwtToken = retrieveJWTToken(token);
+          String hdClaim = retrieveHostedDomain(jwtToken);
+          for (String domain : domains) {
+            if (domain.equalsIgnoreCase(hdClaim)) {
+              domainMatched = true;
+              break;
+            }
+          }
+          if (!domainMatched) {
+            // TODO(davido): improve error reporting in OAuth extension point
+            log.error("Error: hosted domain validation failed: {}", Strings.nullToEmpty(hdClaim));
+            return null;
           }
         }
-        if (!domainMatched) {
-          // TODO(davido): improve error reporting in OAuth extension point
-          log.error("Error: hosted domain validation failed: {}", Strings.nullToEmpty(hdClaim));
-          return null;
+        if (useEmailAsUsername && !email.isJsonNull()) {
+          login = email.getAsString().split("@")[0];
         }
+        return new OAuthUserInfo(
+            GOOGLE_PROVIDER_PREFIX + id.getAsString() /*externalId*/,
+            login /*username*/,
+            email == null || email.isJsonNull() ? null : email.getAsString() /*email*/,
+            name == null || name.isJsonNull() ? null : name.getAsString() /*displayName*/,
+            fixLegacyUserId ? id.getAsString() : null /*claimedIdentity*/);
       }
-      if (useEmailAsUsername && !email.isJsonNull()) {
-        login = email.getAsString().split("@")[0];
-      }
-      return new OAuthUserInfo(
-          GOOGLE_PROVIDER_PREFIX + id.getAsString() /*externalId*/,
-          login /*username*/,
-          email == null || email.isJsonNull() ? null : email.getAsString() /*email*/,
-          name == null || name.isJsonNull() ? null : name.getAsString() /*displayName*/,
-          fixLegacyUserId ? id.getAsString() : null /*claimedIdentity*/);
+    } catch (ExecutionException | InterruptedException e) {
+      throw new RuntimeException("Cannot retrieve user info resource", e);
     }
 
     throw new IOException(String.format("Invalid JSON '%s': not a JSON Object", userJson));
@@ -197,15 +200,20 @@
 
   @Override
   public OAuthToken getAccessToken(OAuthVerifier rv) {
-    Verifier vi = new Verifier(rv.getValue());
-    Token to = service.getAccessToken(null, vi);
-    OAuthToken result = new OAuthToken(to.getToken(), to.getSecret(), to.getRawResponse());
-    return result;
+    try {
+      OAuth2AccessToken accessToken = service.getAccessToken(rv.getValue());
+      return new OAuthToken(
+          accessToken.getAccessToken(), accessToken.getTokenType(), accessToken.getRawResponse());
+    } catch (InterruptedException | ExecutionException | IOException e) {
+      String msg = "Cannot retrieve access token";
+      log.error(msg, e);
+      throw new RuntimeException(msg, e);
+    }
   }
 
   @Override
   public String getAuthorizationUrl() {
-    String url = service.getAuthorizationUrl(null);
+    String url = service.getAuthorizationUrl();
     try {
       if (domains.size() == 1) {
         url += "&hd=" + URLEncoder.encode(domains.get(0), StandardCharsets.UTF_8.name());
diff --git a/src/main/java/com/googlesource/gerrit/plugins/oauth/KeycloakApi.java b/src/main/java/com/googlesource/gerrit/plugins/oauth/KeycloakApi.java
index 581d562..10482da 100644
--- a/src/main/java/com/googlesource/gerrit/plugins/oauth/KeycloakApi.java
+++ b/src/main/java/com/googlesource/gerrit/plugins/oauth/KeycloakApi.java
@@ -14,18 +14,18 @@
 
 package com.googlesource.gerrit.plugins.oauth;
 
-import org.scribe.builder.api.DefaultApi20;
-import org.scribe.extractors.AccessTokenExtractor;
-import org.scribe.extractors.JsonTokenExtractor;
-import org.scribe.model.OAuthConfig;
-import org.scribe.model.Verb;
-import org.scribe.oauth.OAuthService;
-import org.scribe.utils.OAuthEncoder;
+import com.github.scribejava.core.builder.api.DefaultApi20;
+import com.github.scribejava.core.extractors.OAuth2AccessTokenExtractor;
+import com.github.scribejava.core.extractors.TokenExtractor;
+import com.github.scribejava.core.model.OAuth2AccessToken;
+import com.github.scribejava.core.oauth2.bearersignature.BearerSignature;
+import com.github.scribejava.core.oauth2.bearersignature.BearerSignatureURIQueryParameter;
+import com.github.scribejava.core.oauth2.clientauthentication.ClientAuthentication;
+import com.github.scribejava.core.oauth2.clientauthentication.RequestBodyAuthenticationScheme;
 
 public class KeycloakApi extends DefaultApi20 {
 
-  private static final String AUTHORIZE_URL =
-      "%s/auth/realms/%s/protocol/openid-connect/auth?client_id=%s&response_type=code&redirect_uri=%s&scope=%s";
+  private static final String AUTHORIZE_URL = "%s/auth/realms/%s/protocol/openid-connect/auth";
 
   private final String rootUrl;
   private final String realm;
@@ -36,14 +36,8 @@
   }
 
   @Override
-  public String getAuthorizationUrl(OAuthConfig config) {
-    return String.format(
-        AUTHORIZE_URL,
-        rootUrl,
-        realm,
-        config.getApiKey(),
-        OAuthEncoder.encode(config.getCallback()),
-        config.getScope().replaceAll(" ", "+"));
+  public String getAuthorizationBaseUrl() {
+    return String.format(AUTHORIZE_URL, rootUrl, realm);
   }
 
   @Override
@@ -52,17 +46,17 @@
   }
 
   @Override
-  public Verb getAccessTokenVerb() {
-    return Verb.POST;
+  public TokenExtractor<OAuth2AccessToken> getAccessTokenExtractor() {
+    return OAuth2AccessTokenExtractor.instance();
   }
 
   @Override
-  public OAuthService createService(OAuthConfig config) {
-    return new OAuth20ServiceImpl(this, config);
+  public BearerSignature getBearerSignature() {
+    return BearerSignatureURIQueryParameter.instance();
   }
 
   @Override
-  public AccessTokenExtractor getAccessTokenExtractor() {
-    return new JsonTokenExtractor();
+  public ClientAuthentication getClientAuthentication() {
+    return RequestBodyAuthenticationScheme.instance();
   }
 }
diff --git a/src/main/java/com/googlesource/gerrit/plugins/oauth/KeycloakOAuthService.java b/src/main/java/com/googlesource/gerrit/plugins/oauth/KeycloakOAuthService.java
index a958bb8..34f3f87 100644
--- a/src/main/java/com/googlesource/gerrit/plugins/oauth/KeycloakOAuthService.java
+++ b/src/main/java/com/googlesource/gerrit/plugins/oauth/KeycloakOAuthService.java
@@ -16,6 +16,9 @@
 
 import static com.google.gerrit.json.OutputFormat.JSON;
 
+import com.github.scribejava.core.builder.ServiceBuilder;
+import com.github.scribejava.core.model.OAuth2AccessToken;
+import com.github.scribejava.core.oauth.OAuth20Service;
 import com.google.common.base.CharMatcher;
 import com.google.common.base.Preconditions;
 import com.google.gerrit.extensions.annotations.PluginName;
@@ -33,11 +36,8 @@
 import com.google.inject.ProvisionException;
 import java.io.IOException;
 import java.net.URI;
+import java.util.concurrent.ExecutionException;
 import org.apache.commons.codec.binary.Base64;
-import org.scribe.builder.ServiceBuilder;
-import org.scribe.model.Token;
-import org.scribe.model.Verifier;
-import org.scribe.oauth.OAuthService;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
@@ -47,7 +47,7 @@
 
   static final String CONFIG_SUFFIX = "-keycloak-oauth";
   private static final String KEYCLOAK_PROVIDER_PREFIX = "keycloak-oauth:";
-  private final OAuthService service;
+  private final OAuth20Service service;
   private final String serviceName;
 
   @Inject
@@ -66,13 +66,11 @@
     serviceName = cfg.getString(InitOAuth.SERVICE_NAME, "Keycloak OAuth2");
 
     service =
-        new ServiceBuilder()
-            .provider(new KeycloakApi(rootUrl, realm))
-            .apiKey(cfg.getString(InitOAuth.CLIENT_ID))
+        new ServiceBuilder(cfg.getString(InitOAuth.CLIENT_ID))
             .apiSecret(cfg.getString(InitOAuth.CLIENT_SECRET))
-            .scope("openid")
             .callback(canonicalWebUrl + "oauth")
-            .build();
+            .defaultScope("openid")
+            .build(new KeycloakApi(rootUrl, realm));
   }
 
   private String parseJwt(String input) {
@@ -121,14 +119,20 @@
 
   @Override
   public OAuthToken getAccessToken(OAuthVerifier rv) {
-    Verifier vi = new Verifier(rv.getValue());
-    Token to = service.getAccessToken(null, vi);
-    return new OAuthToken(to.getToken(), to.getSecret(), to.getRawResponse());
+    try {
+      OAuth2AccessToken accessToken = service.getAccessToken(rv.getValue());
+      return new OAuthToken(
+          accessToken.getAccessToken(), accessToken.getTokenType(), accessToken.getRawResponse());
+    } catch (InterruptedException | ExecutionException | IOException e) {
+      String msg = "Cannot retrieve access token";
+      log.error(msg, e);
+      throw new RuntimeException(msg, e);
+    }
   }
 
   @Override
   public String getAuthorizationUrl() {
-    return service.getAuthorizationUrl(null);
+    return service.getAuthorizationUrl();
   }
 
   @Override
diff --git a/src/main/java/com/googlesource/gerrit/plugins/oauth/OAuth20ServiceImpl.java b/src/main/java/com/googlesource/gerrit/plugins/oauth/OAuth20ServiceImpl.java
deleted file mode 100644
index ecd8f26..0000000
--- a/src/main/java/com/googlesource/gerrit/plugins/oauth/OAuth20ServiceImpl.java
+++ /dev/null
@@ -1,93 +0,0 @@
-// Copyright (C) 2017 The Android Open Source Project
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-// http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-package com.googlesource.gerrit.plugins.oauth;
-
-import static org.slf4j.LoggerFactory.getLogger;
-
-import org.scribe.builder.api.DefaultApi20;
-import org.scribe.model.OAuthConfig;
-import org.scribe.model.OAuthConstants;
-import org.scribe.model.OAuthRequest;
-import org.scribe.model.Response;
-import org.scribe.model.Token;
-import org.scribe.model.Verifier;
-import org.scribe.oauth.OAuthService;
-import org.slf4j.Logger;
-
-/** TODO(gildur): remove when updating to newer scribe lib */
-final class OAuth20ServiceImpl implements OAuthService {
-  private static final Logger log = getLogger(OAuth20ServiceImpl.class);
-
-  private static final String VERSION = "2.0";
-
-  private static final String GRANT_TYPE = "grant_type";
-  private static final String GRANT_TYPE_VALUE = "authorization_code";
-
-  private final DefaultApi20 api;
-  private final OAuthConfig config;
-
-  /**
-   * Default constructor
-   *
-   * @param api OAuth2.0 api information
-   * @param config OAuth 2.0 configuration param object
-   */
-  public OAuth20ServiceImpl(DefaultApi20 api, OAuthConfig config) {
-    this.api = api;
-    this.config = config;
-  }
-
-  @Override
-  public Token getAccessToken(Token requestToken, Verifier verifier) {
-    OAuthRequest request = new OAuthRequest(api.getAccessTokenVerb(), api.getAccessTokenEndpoint());
-    request.addBodyParameter(OAuthConstants.CLIENT_ID, config.getApiKey());
-    request.addBodyParameter(OAuthConstants.CLIENT_SECRET, config.getApiSecret());
-    request.addBodyParameter(OAuthConstants.CODE, verifier.getValue());
-    request.addBodyParameter(OAuthConstants.REDIRECT_URI, config.getCallback());
-    if (config.hasScope()) {
-      request.addBodyParameter(OAuthConstants.SCOPE, config.getScope());
-    }
-    request.addBodyParameter(GRANT_TYPE, GRANT_TYPE_VALUE);
-    if (log.isDebugEnabled()) {
-      log.debug("Access token request: {}", request);
-    }
-    Response response = request.send();
-    if (log.isDebugEnabled()) {
-      log.debug("Access token response: {}", response.getBody());
-    }
-    return api.getAccessTokenExtractor().extract(response.getBody());
-  }
-
-  @Override
-  public Token getRequestToken() {
-    throw new UnsupportedOperationException(
-        "Unsupported operation, please use 'getAuthorizationUrl' and redirect your users there");
-  }
-
-  @Override
-  public String getVersion() {
-    return VERSION;
-  }
-
-  @Override
-  public void signRequest(Token accessToken, OAuthRequest request) {
-    request.addQuerystringParameter(OAuthConstants.ACCESS_TOKEN, accessToken.getToken());
-  }
-
-  @Override
-  public String getAuthorizationUrl(Token requestToken) {
-    return api.getAuthorizationUrl(config);
-  }
-}
diff --git a/src/main/java/com/googlesource/gerrit/plugins/oauth/OAuth2AccessTokenJsonExtractor.java b/src/main/java/com/googlesource/gerrit/plugins/oauth/OAuth2AccessTokenJsonExtractor.java
deleted file mode 100644
index 6c2f1a0..0000000
--- a/src/main/java/com/googlesource/gerrit/plugins/oauth/OAuth2AccessTokenJsonExtractor.java
+++ /dev/null
@@ -1,49 +0,0 @@
-// Copyright (C) 2018 The Android Open Source Project
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-// http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-package com.googlesource.gerrit.plugins.oauth;
-
-import static org.scribe.model.OAuthConstants.ACCESS_TOKEN;
-
-import com.google.common.annotations.VisibleForTesting;
-import java.util.regex.Matcher;
-import java.util.regex.Pattern;
-import org.scribe.exceptions.OAuthException;
-import org.scribe.extractors.AccessTokenExtractor;
-import org.scribe.model.Token;
-import org.scribe.utils.Preconditions;
-
-class OAuth2AccessTokenJsonExtractor implements AccessTokenExtractor {
-  private static final Pattern ACCESS_TOKEN_REGEX_PATTERN =
-      Pattern.compile("\"" + ACCESS_TOKEN + "\"\\s*:\\s*\"(\\S*?)\"");
-
-  private OAuth2AccessTokenJsonExtractor() {}
-
-  private static final AccessTokenExtractor INSTANCE = new OAuth2AccessTokenJsonExtractor();
-
-  static AccessTokenExtractor instance() {
-    return INSTANCE;
-  }
-
-  @VisibleForTesting
-  @Override
-  public Token extract(String response) {
-    Preconditions.checkEmptyString(response, "Cannot extract a token from a null or empty String");
-    Matcher matcher = ACCESS_TOKEN_REGEX_PATTERN.matcher(response);
-    if (matcher.find()) {
-      return new Token(matcher.group(1), "", response);
-    }
-    throw new OAuthException("Cannot extract an access token. Response was: " + response);
-  }
-}
diff --git a/src/main/java/com/googlesource/gerrit/plugins/oauth/Office365Api.java b/src/main/java/com/googlesource/gerrit/plugins/oauth/Office365Api.java
index 8a28520..7e9bef8 100644
--- a/src/main/java/com/googlesource/gerrit/plugins/oauth/Office365Api.java
+++ b/src/main/java/com/googlesource/gerrit/plugins/oauth/Office365Api.java
@@ -14,49 +14,23 @@
 
 package com.googlesource.gerrit.plugins.oauth;
 
-import static org.scribe.utils.OAuthEncoder.encode;
-
-import org.scribe.builder.api.DefaultApi20;
-import org.scribe.extractors.AccessTokenExtractor;
-import org.scribe.model.OAuthConfig;
-import org.scribe.model.Verb;
-import org.scribe.oauth.OAuthService;
-import org.scribe.utils.Preconditions;
+import com.github.scribejava.core.builder.api.DefaultApi20;
+import com.github.scribejava.core.oauth2.clientauthentication.ClientAuthentication;
+import com.github.scribejava.core.oauth2.clientauthentication.RequestBodyAuthenticationScheme;
 
 public class Office365Api extends DefaultApi20 {
-  private static final String AUTHORIZE_URL =
-      "https://login.microsoftonline.com/organizations/oauth2/v2.0/authorize?client_id=%s&response_type=code&redirect_uri=%s&scope=%s";
-
   @Override
   public String getAccessTokenEndpoint() {
     return "https://login.microsoftonline.com/organizations/oauth2/v2.0/token";
   }
 
   @Override
-  public String getAuthorizationUrl(OAuthConfig config) {
-    Preconditions.checkValidUrl(
-        config.getCallback(),
-        "Must provide a valid url as callback. Office365 does not support OOB");
-    Preconditions.checkEmptyString(
-        config.getScope(),
-        "Must provide a valid value as scope. Office365 does not support no scope");
-
-    return String.format(
-        AUTHORIZE_URL, config.getApiKey(), encode(config.getCallback()), encode(config.getScope()));
+  public String getAuthorizationBaseUrl() {
+    return "https://login.microsoftonline.com/organizations/oauth2/v2.0/authorize";
   }
 
   @Override
-  public Verb getAccessTokenVerb() {
-    return Verb.POST;
-  }
-
-  @Override
-  public OAuthService createService(OAuthConfig config) {
-    return new OAuth20ServiceImpl(this, config);
-  }
-
-  @Override
-  public AccessTokenExtractor getAccessTokenExtractor() {
-    return OAuth2AccessTokenJsonExtractor.instance();
+  public ClientAuthentication getClientAuthentication() {
+    return RequestBodyAuthenticationScheme.instance();
   }
 }
diff --git a/src/main/java/com/googlesource/gerrit/plugins/oauth/Office365OAuthService.java b/src/main/java/com/googlesource/gerrit/plugins/oauth/Office365OAuthService.java
index aee8f63..c1380bc 100644
--- a/src/main/java/com/googlesource/gerrit/plugins/oauth/Office365OAuthService.java
+++ b/src/main/java/com/googlesource/gerrit/plugins/oauth/Office365OAuthService.java
@@ -16,6 +16,12 @@
 
 import static com.google.gerrit.json.OutputFormat.JSON;
 
+import com.github.scribejava.core.builder.ServiceBuilder;
+import com.github.scribejava.core.model.OAuth2AccessToken;
+import com.github.scribejava.core.model.OAuthRequest;
+import com.github.scribejava.core.model.Response;
+import com.github.scribejava.core.model.Verb;
+import com.github.scribejava.core.oauth.OAuth20Service;
 import com.google.common.base.CharMatcher;
 import com.google.gerrit.extensions.annotations.PluginName;
 import com.google.gerrit.extensions.auth.oauth.OAuthServiceProvider;
@@ -31,14 +37,8 @@
 import com.google.inject.Provider;
 import com.google.inject.Singleton;
 import java.io.IOException;
+import java.util.concurrent.ExecutionException;
 import javax.servlet.http.HttpServletResponse;
-import org.scribe.builder.ServiceBuilder;
-import org.scribe.model.OAuthRequest;
-import org.scribe.model.Response;
-import org.scribe.model.Token;
-import org.scribe.model.Verb;
-import org.scribe.model.Verifier;
-import org.scribe.oauth.OAuthService;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
@@ -50,7 +50,7 @@
   private static final String PROTECTED_RESOURCE_URL = "https://graph.microsoft.com/v1.0/me";
   private static final String SCOPE =
       "openid offline_access https://graph.microsoft.com/user.readbasic.all";
-  private final OAuthService service;
+  private final OAuth20Service service;
   private final String canonicalWebUrl;
   private final boolean useEmailAsUsername;
 
@@ -63,13 +63,11 @@
     this.canonicalWebUrl = CharMatcher.is('/').trimTrailingFrom(urlProvider.get()) + "/";
     this.useEmailAsUsername = cfg.getBoolean(InitOAuth.USE_EMAIL_AS_USERNAME, false);
     this.service =
-        new ServiceBuilder()
-            .provider(Office365Api.class)
-            .apiKey(cfg.getString(InitOAuth.CLIENT_ID))
+        new ServiceBuilder(cfg.getString(InitOAuth.CLIENT_ID))
             .apiSecret(cfg.getString(InitOAuth.CLIENT_SECRET))
             .callback(canonicalWebUrl + "oauth")
-            .scope(SCOPE)
-            .build();
+            .defaultScope(SCOPE)
+            .build(new Office365Api());
     if (log.isDebugEnabled()) {
       log.debug("OAuth2: canonicalWebUrl={}", canonicalWebUrl);
       log.debug("OAuth2: scope={}", SCOPE);
@@ -80,38 +78,43 @@
   @Override
   public OAuthUserInfo getUserInfo(OAuthToken token) throws IOException {
     OAuthRequest request = new OAuthRequest(Verb.GET, PROTECTED_RESOURCE_URL);
-    request.addHeader("Accept", "*/*");
-    request.addHeader("Authorization", "Bearer " + token.getToken());
-    Response response = request.send();
-    if (response.getCode() != HttpServletResponse.SC_OK) {
-      throw new IOException(
-          String.format(
-              "Status %s (%s) for request %s",
-              response.getCode(), response.getBody(), request.getUrl()));
-    }
-    JsonElement userJson = JSON.newGson().fromJson(response.getBody(), JsonElement.class);
-    if (log.isDebugEnabled()) {
-      log.debug("User info response: {}", response.getBody());
-    }
-    if (userJson.isJsonObject()) {
-      JsonObject jsonObject = userJson.getAsJsonObject();
-      JsonElement id = jsonObject.get("id");
-      if (id == null || id.isJsonNull()) {
-        throw new IOException("Response doesn't contain id field");
-      }
-      JsonElement email = jsonObject.get("mail");
-      JsonElement name = jsonObject.get("displayName");
-      String login = null;
+    OAuth2AccessToken t = new OAuth2AccessToken(token.getToken(), token.getRaw());
+    service.signRequest(t, request);
 
-      if (useEmailAsUsername && !email.isJsonNull()) {
-        login = email.getAsString().split("@")[0];
+    JsonElement userJson = null;
+    try (Response response = service.execute(request)) {
+      if (response.getCode() != HttpServletResponse.SC_OK) {
+        throw new IOException(
+            String.format(
+                "Status %s (%s) for request %s",
+                response.getCode(), response.getBody(), request.getUrl()));
       }
-      return new OAuthUserInfo(
-          OFFICE365_PROVIDER_PREFIX + id.getAsString() /*externalId*/,
-          login /*username*/,
-          email == null || email.isJsonNull() ? null : email.getAsString() /*email*/,
-          name == null || name.isJsonNull() ? null : name.getAsString() /*displayName*/,
-          null);
+      userJson = JSON.newGson().fromJson(response.getBody(), JsonElement.class);
+      if (log.isDebugEnabled()) {
+        log.debug("User info response: {}", response.getBody());
+      }
+      if (userJson.isJsonObject()) {
+        JsonObject jsonObject = userJson.getAsJsonObject();
+        JsonElement id = jsonObject.get("id");
+        if (id == null || id.isJsonNull()) {
+          throw new IOException("Response doesn't contain id field");
+        }
+        JsonElement email = jsonObject.get("mail");
+        JsonElement name = jsonObject.get("displayName");
+        String login = null;
+
+        if (useEmailAsUsername && !email.isJsonNull()) {
+          login = email.getAsString().split("@")[0];
+        }
+        return new OAuthUserInfo(
+            OFFICE365_PROVIDER_PREFIX + id.getAsString() /*externalId*/,
+            login /*username*/,
+            email == null || email.isJsonNull() ? null : email.getAsString() /*email*/,
+            name == null || name.isJsonNull() ? null : name.getAsString() /*displayName*/,
+            null);
+      }
+    } catch (ExecutionException | InterruptedException e) {
+      throw new RuntimeException("Cannot retrieve user info resource", e);
     }
 
     throw new IOException(String.format("Invalid JSON '%s': not a JSON Object", userJson));
@@ -119,15 +122,20 @@
 
   @Override
   public OAuthToken getAccessToken(OAuthVerifier rv) {
-    Verifier vi = new Verifier(rv.getValue());
-    Token to = service.getAccessToken(null, vi);
-    OAuthToken result = new OAuthToken(to.getToken(), to.getSecret(), to.getRawResponse());
-    return result;
+    try {
+      OAuth2AccessToken accessToken = service.getAccessToken(rv.getValue());
+      return new OAuthToken(
+          accessToken.getAccessToken(), accessToken.getTokenType(), accessToken.getRawResponse());
+    } catch (InterruptedException | ExecutionException | IOException e) {
+      String msg = "Cannot retrieve access token";
+      log.error(msg, e);
+      throw new RuntimeException(msg, e);
+    }
   }
 
   @Override
   public String getAuthorizationUrl() {
-    String url = service.getAuthorizationUrl(null);
+    String url = service.getAuthorizationUrl();
     return url;
   }
 
diff --git a/src/main/resources/Documentation/config.md b/src/main/resources/Documentation/config.md
index 757ea1e..a97fd16 100644
--- a/src/main/resources/Documentation/config.md
+++ b/src/main/resources/Documentation/config.md
@@ -19,6 +19,7 @@
     link-to-existing-openid-accounts = true
 
   [plugin "@PLUGIN@-github-oauth"]
+    root-url = "<github url>" # https://github.com/ or https://git.company.com/
     client-id = "<client-id>"
     client-secret = "<client-secret>"
 
diff --git a/src/test/java/com/googlesource/gerrit/plugins/oauth/GithubApiUrlTest.java b/src/test/java/com/googlesource/gerrit/plugins/oauth/GithubApiUrlTest.java
new file mode 100644
index 0000000..ba3f2f7
--- /dev/null
+++ b/src/test/java/com/googlesource/gerrit/plugins/oauth/GithubApiUrlTest.java
@@ -0,0 +1,107 @@
+// Copyright (C) 2019 The Android Open Source Project
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package com.googlesource.gerrit.plugins.oauth;
+
+import static com.google.common.truth.Truth.assertThat;
+import static org.mockito.Mockito.when;
+
+import com.google.common.base.CharMatcher;
+import com.google.common.base.Strings;
+import com.google.gerrit.extensions.auth.oauth.OAuthServiceProvider;
+import com.google.gerrit.server.config.PluginConfig;
+import com.google.gerrit.server.config.PluginConfigFactory;
+import com.google.inject.Provider;
+import java.net.URLEncoder;
+import java.nio.charset.StandardCharsets;
+import org.eclipse.jgit.lib.Config;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.mockito.Mock;
+import org.mockito.junit.MockitoJUnitRunner;
+
+@RunWith(MockitoJUnitRunner.class)
+public class GithubApiUrlTest {
+  private static final String PLUGIN_NAME = "gerrit-oauth-provider";
+  private static final String CANONICAL_URL = "https://localhost";
+  private static final String TEST_CLIENT_ID = "test_client_id";
+
+  @Mock private PluginConfigFactory pluginConfigFactoryMock;
+  @Mock private Provider<String> urlProviderMock;
+
+  private OAuthServiceProvider getGithubOAuthProvider(String rootUrl) {
+    PluginConfig pluginConfig =
+        new PluginConfig(PLUGIN_NAME + GitHubOAuthService.CONFIG_SUFFIX, new Config());
+    if (!Strings.isNullOrEmpty(rootUrl)) {
+      pluginConfig.setString(InitOAuth.ROOT_URL, rootUrl);
+    }
+    pluginConfig.setString(InitOAuth.CLIENT_ID, TEST_CLIENT_ID);
+    pluginConfig.setString(InitOAuth.CLIENT_SECRET, "secret");
+    when(pluginConfigFactoryMock.getFromGerritConfig(
+            PLUGIN_NAME + GitHubOAuthService.CONFIG_SUFFIX))
+        .thenReturn(pluginConfig);
+    when(urlProviderMock.get()).thenReturn(CANONICAL_URL);
+
+    return new GitHubOAuthService(pluginConfigFactoryMock, PLUGIN_NAME, urlProviderMock);
+  }
+
+  private String getExpectedUrl(String rootUrl) throws Exception {
+    if (rootUrl == null) {
+      rootUrl = GitHubOAuthService.GITHUB_ROOT_URL;
+    }
+    rootUrl = CharMatcher.is('/').trimTrailingFrom(rootUrl) + "/";
+    return String.format(
+        "%slogin/oauth/authorize?response_type=code&client_id=%s&redirect_uri=%s%s&scope=%s",
+        rootUrl,
+        TEST_CLIENT_ID,
+        URLEncoder.encode(CANONICAL_URL, StandardCharsets.UTF_8.name()),
+        URLEncoder.encode("/oauth", StandardCharsets.UTF_8.name()),
+        URLEncoder.encode(GitHubOAuthService.SCOPE, StandardCharsets.UTF_8.name()));
+  }
+
+  @Test
+  public void nullUrlIsLoaded() throws Exception {
+    String rootUrl = null;
+    OAuthServiceProvider provider = getGithubOAuthProvider(rootUrl);
+    assertThat(provider.getAuthorizationUrl()).isEqualTo(getExpectedUrl(rootUrl));
+  }
+
+  @Test
+  public void githubUrlIsLoaded() throws Exception {
+    String rootUrl = "https://github.com";
+    OAuthServiceProvider provider = getGithubOAuthProvider(rootUrl);
+    assertThat(provider.getAuthorizationUrl()).isEqualTo(getExpectedUrl(rootUrl));
+  }
+
+  @Test
+  public void githubUrlWithTrailingSlashIsLoaded() throws Exception {
+    String rootUrl = "https://github.com/";
+    OAuthServiceProvider provider = getGithubOAuthProvider(rootUrl);
+    assertThat(provider.getAuthorizationUrl()).isEqualTo(getExpectedUrl(rootUrl));
+  }
+
+  @Test
+  public void gheUrlIsLoaded() throws Exception {
+    String rootUrl = "https://git.yourcompany.com";
+    OAuthServiceProvider provider = getGithubOAuthProvider(rootUrl);
+    assertThat(provider.getAuthorizationUrl()).isEqualTo(getExpectedUrl(rootUrl));
+  }
+
+  @Test
+  public void gheUrlWithTrailingSlashIsLoaded() throws Exception {
+    String rootUrl = "https://git.yourcompany.com/";
+    OAuthServiceProvider provider = getGithubOAuthProvider(rootUrl);
+    assertThat(provider.getAuthorizationUrl()).isEqualTo(getExpectedUrl(rootUrl));
+  }
+}
diff --git a/src/test/java/com/googlesource/gerrit/plugins/oauth/OAuth2AccessTokenJsonExtractorTest.java b/src/test/java/com/googlesource/gerrit/plugins/oauth/OAuth2AccessTokenJsonExtractorTest.java
deleted file mode 100644
index ccc1db3..0000000
--- a/src/test/java/com/googlesource/gerrit/plugins/oauth/OAuth2AccessTokenJsonExtractorTest.java
+++ /dev/null
@@ -1,70 +0,0 @@
-// Copyright (C) 2018 The Android Open Source Project
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-// http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-package com.googlesource.gerrit.plugins.oauth;
-
-import static com.google.common.truth.Truth.assertThat;
-import static com.google.gerrit.testing.GerritJUnit.assertThrows;
-import static org.junit.Assert.assertEquals;
-import static org.scribe.model.OAuthConstants.ACCESS_TOKEN;
-
-import org.junit.Test;
-import org.scribe.exceptions.OAuthException;
-import org.scribe.extractors.AccessTokenExtractor;
-import org.scribe.model.Token;
-
-public class OAuth2AccessTokenJsonExtractorTest {
-  private static final AccessTokenExtractor extractor = OAuth2AccessTokenJsonExtractor.instance();
-  private static final String TOKEN = "I0122HHJKLEM21F3WLPYHDKGKZULAUO4SGMV3ABKFTDT3T3X";
-  private static final String RESPONSE = "{\"" + ACCESS_TOKEN + "\":\"" + TOKEN + "\"}'";
-  private static final String RESPONSE_NON_JSON = ACCESS_TOKEN + "=" + TOKEN;
-  private static final String RESPONSE_WITH_BLANKS =
-      "{ \"" + ACCESS_TOKEN + "\" : \"" + TOKEN + "\"}'";
-  private static final String MESSAGE = "Cannot extract a token from a null or empty String";
-
-  @Test
-  public void parseResponse() throws Exception {
-    Token token = extractor.extract(RESPONSE);
-    assertEquals(token.getToken(), TOKEN);
-  }
-
-  @Test
-  public void parseResponseWithBlanks() throws Exception {
-    Token token = extractor.extract(RESPONSE_WITH_BLANKS);
-    assertEquals(token.getToken(), TOKEN);
-  }
-
-  @Test
-  public void failParseNonJsonResponse() throws Exception {
-    OAuthException thrown =
-        assertThrows(OAuthException.class, () -> extractor.extract(RESPONSE_NON_JSON));
-    assertThat(thrown)
-        .hasMessageThat()
-        .contains("Cannot extract an access token. Response was: " + RESPONSE_NON_JSON);
-  }
-
-  @Test
-  public void shouldThrowExceptionIfForNullParameter() throws Exception {
-    IllegalArgumentException thrown =
-        assertThrows(IllegalArgumentException.class, () -> extractor.extract(null));
-    assertThat(thrown).hasMessageThat().contains(MESSAGE);
-  }
-
-  @Test
-  public void shouldThrowExceptionIfForEmptyString() throws Exception {
-    IllegalArgumentException thrown =
-        assertThrows(IllegalArgumentException.class, () -> extractor.extract(""));
-    assertThat(thrown).hasMessageThat().contains(MESSAGE);
-  }
-}