diff --git a/.bazelversion b/.bazelversion
index fd2a018..47b322c 100644
--- a/.bazelversion
+++ b/.bazelversion
@@ -1 +1 @@
-3.1.0
+3.4.1
diff --git a/BUILD b/BUILD
index 8eb7d2a..81ab40d 100644
--- a/BUILD
+++ b/BUILD
@@ -41,6 +41,5 @@
     exports = PLUGIN_DEPS + PLUGIN_TEST_DEPS + [
         ":lfs__plugin",
         "@jgit-lfs//jar",
-        "@joda-time//jar",
     ],
 )
diff --git a/WORKSPACE b/WORKSPACE
index 28d10d5..371d120 100644
--- a/WORKSPACE
+++ b/WORKSPACE
@@ -3,28 +3,17 @@
 load("//:bazlets.bzl", "load_bazlets")
 
 load_bazlets(
-    commit = "8ad33887665f4f6adf7cb465a03f6bd81b95e01d",
+    commit = "7472a1104a37d514799100d6556445836e8efe4c",
     #local_path = "/home/<user>/projects/bazlets",
 )
 
-# Release Plugin API
 load(
     "@com_googlesource_gerrit_bazlets//:gerrit_api.bzl",
     "gerrit_api",
 )
 
-# Snapshot Plugin API
-#load(
-#    "@com_googlesource_gerrit_bazlets//:gerrit_api_maven_local.bzl",
-#    "gerrit_api_maven_local",
-#)
-
-# Load release Plugin API
 gerrit_api()
 
-# Load snapshot Plugin API
-#gerrit_api_maven_local()
-
 load(":external_plugin_deps.bzl", "external_plugin_deps")
 
 external_plugin_deps()
diff --git a/external_plugin_deps.bzl b/external_plugin_deps.bzl
index 8f9e7d2..3fa929f 100644
--- a/external_plugin_deps.bzl
+++ b/external_plugin_deps.bzl
@@ -1,15 +1,14 @@
 load("//tools/bzl:maven_jar.bzl", "GERRIT", "MAVEN_CENTRAL", "MAVEN_LOCAL", "maven_jar")
 
-JGIT_VERSION = "5.1.12.201910011832-r"
+JGIT_VERSION = "5.3.6.201910020505-r"
 REPO = MAVEN_CENTRAL
 
 def external_plugin_deps():
     maven_jar(
         name = "jgit-http-apache",
         artifact = "org.eclipse.jgit:org.eclipse.jgit.http.apache:" + JGIT_VERSION,
-        sha1 = "92ad62799dd7eb02cc8805f2e297714cc3bb5149",
+        sha1 = "668c69822b4f54b430dd9880cc2bb13f13aa88d1",
         repository = REPO,
-        unsign = True,
         exclude = [
             "about.html",
             "plugin.properties",
@@ -19,9 +18,8 @@
     maven_jar(
         name = "jgit-lfs",
         artifact = "org.eclipse.jgit:org.eclipse.jgit.lfs:" + JGIT_VERSION,
-        sha1 = "bb4972c6e127c615c4b9183f95414ff2a20916cf",
+        sha1 = "153e32275cb0ccfd7f6dba89cf58392d42e16c3a",
         repository = REPO,
-        unsign = True,
         exclude = [
             "about.html",
             "plugin.properties",
@@ -31,17 +29,10 @@
     maven_jar(
         name = "jgit-lfs-server",
         artifact = "org.eclipse.jgit:org.eclipse.jgit.lfs.server:" + JGIT_VERSION,
-        sha1 = "b2d1e48f9daddc09e072e422c151384e845c1612",
+        sha1 = "e37339c77dd00d96269e280d582c742c424b908f",
         repository = REPO,
-        unsign = True,
         exclude = [
             "about.html",
             "plugin.properties",
         ],
     )
-
-    maven_jar(
-        name = "joda-time",
-        artifact = "joda-time:joda-time:2.9.9",
-        sha1 = "f7b520c458572890807d143670c9b24f4de90897",
-    )
diff --git a/src/main/java/com/googlesource/gerrit/plugins/lfs/HttpModule.java b/src/main/java/com/googlesource/gerrit/plugins/lfs/HttpModule.java
index 2bd7091..aabbd69 100644
--- a/src/main/java/com/googlesource/gerrit/plugins/lfs/HttpModule.java
+++ b/src/main/java/com/googlesource/gerrit/plugins/lfs/HttpModule.java
@@ -62,11 +62,6 @@
       populateRepository(backend);
     }
 
-    // Only for GWT-UI
-    DynamicSet.bind(binder(), WebUiPlugin.class)
-        .toInstance(new JavaScriptPlugin("lfs-project-info.js"));
-
-    // Only for PolyGerrit-UI
     DynamicSet.bind(binder(), WebUiPlugin.class).toInstance(new JavaScriptPlugin("gr-lfs.html"));
   }
 
diff --git a/src/main/java/com/googlesource/gerrit/plugins/lfs/InitLfs.java b/src/main/java/com/googlesource/gerrit/plugins/lfs/InitLfs.java
index 89e6238..f44c8d8 100644
--- a/src/main/java/com/googlesource/gerrit/plugins/lfs/InitLfs.java
+++ b/src/main/java/com/googlesource/gerrit/plugins/lfs/InitLfs.java
@@ -36,7 +36,4 @@
   public void run() throws Exception {
     lfs.set(PLUGIN_KEY, name);
   }
-
-  @Override
-  public void postRun() throws Exception {}
 }
diff --git a/src/main/java/com/googlesource/gerrit/plugins/lfs/LfsApiServlet.java b/src/main/java/com/googlesource/gerrit/plugins/lfs/LfsApiServlet.java
index 8982dbe..992dada 100644
--- a/src/main/java/com/googlesource/gerrit/plugins/lfs/LfsApiServlet.java
+++ b/src/main/java/com/googlesource/gerrit/plugins/lfs/LfsApiServlet.java
@@ -22,9 +22,9 @@
 import static com.google.gerrit.server.permissions.ProjectPermission.PUSH_AT_LEAST_ONE_REF;
 
 import com.google.common.flogger.FluentLogger;
-import com.google.gerrit.common.ProjectUtil;
 import com.google.gerrit.reviewdb.client.Project;
 import com.google.gerrit.server.CurrentUser;
+import com.google.gerrit.server.ProjectUtil;
 import com.google.gerrit.server.permissions.PermissionBackend;
 import com.google.gerrit.server.project.ProjectCache;
 import com.google.gerrit.server.project.ProjectState;
@@ -81,7 +81,7 @@
       throw new LfsException("no repository at " + pathInfo);
     }
     String projName = matcher.group(1);
-    Project.NameKey project = Project.NameKey.parse(ProjectUtil.stripGitSuffix(projName));
+    Project.NameKey project = Project.nameKey(ProjectUtil.stripGitSuffix(projName));
     ProjectState state = projectCache.get(project);
     if (state == null || state.getProject().getState() == HIDDEN) {
       throw new LfsRepositoryNotFound(project.get());
diff --git a/src/main/java/com/googlesource/gerrit/plugins/lfs/LfsDateTime.java b/src/main/java/com/googlesource/gerrit/plugins/lfs/LfsDateTime.java
index 4a1936c..1a4c689 100644
--- a/src/main/java/com/googlesource/gerrit/plugins/lfs/LfsDateTime.java
+++ b/src/main/java/com/googlesource/gerrit/plugins/lfs/LfsDateTime.java
@@ -20,6 +20,8 @@
 import java.util.Locale;
 
 public class LfsDateTime {
+  private LfsDateTime() {}
+
   private static final DateTimeFormatter FORMAT =
       DateTimeFormatter.ofPattern("yyyy-MM-dd'T'HH:mm:ss.SSSZZZZZ")
           .withZone(ZoneOffset.UTC)
diff --git a/src/main/java/com/googlesource/gerrit/plugins/lfs/LfsGson.java b/src/main/java/com/googlesource/gerrit/plugins/lfs/LfsGson.java
index 66398fe..f2af66e 100644
--- a/src/main/java/com/googlesource/gerrit/plugins/lfs/LfsGson.java
+++ b/src/main/java/com/googlesource/gerrit/plugins/lfs/LfsGson.java
@@ -17,8 +17,6 @@
 import com.google.gson.FieldNamingPolicy;
 import com.google.gson.Gson;
 import com.google.gson.GsonBuilder;
-import com.google.gson.JsonIOException;
-import com.google.gson.JsonSyntaxException;
 import com.google.inject.Singleton;
 import java.io.Reader;
 
@@ -34,7 +32,7 @@
             .create();
   }
 
-  public void toJson(Object src, Appendable writer) throws JsonIOException {
+  public void toJson(Object src, Appendable writer) {
     gson.toJson(src, writer);
   }
 
@@ -42,8 +40,7 @@
     return gson.toJson(src);
   }
 
-  public <T> T fromJson(Reader json, Class<T> classOfT)
-      throws JsonSyntaxException, JsonIOException {
+  public <T> T fromJson(Reader json, Class<T> classOfT) {
     return gson.fromJson(json, classOfT);
   }
 }
diff --git a/src/main/java/com/googlesource/gerrit/plugins/lfs/auth/LfsAuthUserProvider.java b/src/main/java/com/googlesource/gerrit/plugins/lfs/auth/LfsAuthUserProvider.java
index fcd4736..cc19dd3 100644
--- a/src/main/java/com/googlesource/gerrit/plugins/lfs/auth/LfsAuthUserProvider.java
+++ b/src/main/java/com/googlesource/gerrit/plugins/lfs/auth/LfsAuthUserProvider.java
@@ -14,6 +14,7 @@
 
 package com.googlesource.gerrit.plugins.lfs.auth;
 
+import static com.google.common.base.MoreObjects.firstNonNull;
 import static com.googlesource.gerrit.plugins.lfs.auth.LfsSshRequestAuthorizer.SSH_AUTH_PREFIX;
 
 import com.google.common.base.Strings;
@@ -30,7 +31,7 @@
 @Singleton
 public class LfsAuthUserProvider {
   private final Provider<AnonymousUser> anonymous;
-  private final Provider<CurrentUser> user;
+  private final Provider<CurrentUser> currentUser;
   private final LfsSshRequestAuthorizer sshAuth;
   private final AccountCache accounts;
   private final IdentifiedUser.GenericFactory userFactory;
@@ -38,12 +39,12 @@
   @Inject
   LfsAuthUserProvider(
       Provider<AnonymousUser> anonymous,
-      Provider<CurrentUser> user,
+      Provider<CurrentUser> currentUser,
       LfsSshRequestAuthorizer sshAuth,
       AccountCache accounts,
       IdentifiedUser.GenericFactory userFactory) {
     this.anonymous = anonymous;
-    this.user = user;
+    this.currentUser = currentUser;
     this.sshAuth = sshAuth;
     this.accounts = accounts;
     this.userFactory = userFactory;
@@ -61,7 +62,6 @@
         }
       }
     }
-    CurrentUser currentUser = user.get();
-    return currentUser != null ? currentUser : anonymous.get();
+    return firstNonNull(currentUser.get(), anonymous.get());
   }
 }
diff --git a/src/main/java/com/googlesource/gerrit/plugins/lfs/auth/LfsSshAuth.java b/src/main/java/com/googlesource/gerrit/plugins/lfs/auth/LfsSshAuth.java
index 9fd57b9..3dd7a86 100644
--- a/src/main/java/com/googlesource/gerrit/plugins/lfs/auth/LfsSshAuth.java
+++ b/src/main/java/com/googlesource/gerrit/plugins/lfs/auth/LfsSshAuth.java
@@ -44,7 +44,7 @@
   }
 
   @Override
-  public String authenticate(CurrentUser user, List<String> args) throws UnloggedFailure, Failure {
+  public String authenticate(CurrentUser user, List<String> args) throws Failure {
     if (args.size() != 2) {
       throw new UnloggedFailure(1, "Unexpected number of arguments");
     }
diff --git a/src/main/java/com/googlesource/gerrit/plugins/lfs/locks/LfsLocksAction.java b/src/main/java/com/googlesource/gerrit/plugins/lfs/locks/LfsLocksAction.java
index 4b6afb4..32536f7 100644
--- a/src/main/java/com/googlesource/gerrit/plugins/lfs/locks/LfsLocksAction.java
+++ b/src/main/java/com/googlesource/gerrit/plugins/lfs/locks/LfsLocksAction.java
@@ -22,10 +22,10 @@
 import static org.eclipse.jgit.util.HttpSupport.HDR_AUTHORIZATION;
 
 import com.google.common.flogger.FluentLogger;
-import com.google.gerrit.common.ProjectUtil;
 import com.google.gerrit.extensions.restapi.AuthException;
 import com.google.gerrit.reviewdb.client.Project;
 import com.google.gerrit.server.CurrentUser;
+import com.google.gerrit.server.ProjectUtil;
 import com.google.gerrit.server.permissions.PermissionBackend;
 import com.google.gerrit.server.permissions.PermissionBackend.ForProject;
 import com.google.gerrit.server.permissions.PermissionBackendException;
@@ -100,7 +100,7 @@
       throws LfsException, IOException;
 
   protected ProjectState getProject(String name) throws LfsRepositoryNotFound {
-    Project.NameKey project = Project.NameKey.parse(ProjectUtil.stripGitSuffix(name));
+    Project.NameKey project = Project.nameKey(ProjectUtil.stripGitSuffix(name));
     ProjectState state = projectCache.get(project);
     if (state == null || state.getProject().getState() == HIDDEN) {
       throw new LfsRepositoryNotFound(project.get());
diff --git a/src/main/java/com/googlesource/gerrit/plugins/lfs/locks/LfsLocksHandler.java b/src/main/java/com/googlesource/gerrit/plugins/lfs/locks/LfsLocksHandler.java
index 1de28f4..66ee924 100644
--- a/src/main/java/com/googlesource/gerrit/plugins/lfs/locks/LfsLocksHandler.java
+++ b/src/main/java/com/googlesource/gerrit/plugins/lfs/locks/LfsLocksHandler.java
@@ -14,6 +14,8 @@
 
 package com.googlesource.gerrit.plugins.lfs.locks;
 
+import static java.util.stream.Collectors.groupingBy;
+
 import com.google.common.cache.CacheLoader;
 import com.google.common.cache.LoadingCache;
 import com.google.common.collect.ImmutableList;
@@ -29,7 +31,6 @@
 import java.util.List;
 import java.util.Map;
 import java.util.Optional;
-import java.util.stream.Collectors;
 import org.eclipse.jgit.lfs.errors.LfsException;
 
 @Singleton
@@ -66,14 +67,10 @@
     };
   }
 
-  private final PathToLockId toLockId;
   private final LoadingCache<Project.NameKey, LfsProjectLocks> projectLocks;
 
   @Inject
-  LfsLocksHandler(
-      PathToLockId toLockId,
-      @Named(CACHE_NAME) LoadingCache<Project.NameKey, LfsProjectLocks> projectLocks) {
-    this.toLockId = toLockId;
+  LfsLocksHandler(@Named(CACHE_NAME) LoadingCache<Project.NameKey, LfsProjectLocks> projectLocks) {
     this.projectLocks = projectLocks;
   }
 
@@ -99,10 +96,9 @@
     }
 
     LfsLock lock = hasLock.get();
-    if (lock.owner.name.equals(user.getUserName().get())) {
-      locks.deleteLock(lock);
-      return new LfsLockResponse(lock);
-    } else if (input.force) {
+    Optional<String> username = user.getUserName();
+    if ((username.isPresent() && lock.owner.name.equals(username.get()))
+        || Boolean.TRUE.equals(input.force)) {
       locks.deleteLock(lock);
       return new LfsLockResponse(lock);
     }
@@ -116,18 +112,13 @@
     LfsProjectLocks locks = projectLocks.getUnchecked(project);
     Map<Boolean, List<LfsLock>> groupByOurs =
         locks.getLocks().stream()
-            .collect(
-                Collectors.groupingBy(
-                    (in) -> {
-                      return in.owner.name.equals(user.getUserName().get());
-                    }));
+            .collect(groupingBy(in -> in.owner.name.equals(user.getUserName().get())));
     return new LfsVerifyLocksResponse(groupByOurs.get(true), groupByOurs.get(false), null);
   }
 
   LfsGetLocksResponse listLocksByPath(Project.NameKey project, String path) {
     log.atFine().log("Get lock for %s path in %s project", path, project);
-    String lockId = toLockId.apply(path);
-    return listLocksById(project, lockId);
+    return listLocksById(project, PathToLockId.CONVERTER.convert(path));
   }
 
   LfsGetLocksResponse listLocksById(Project.NameKey project, String id) {
diff --git a/src/main/java/com/googlesource/gerrit/plugins/lfs/locks/LfsProjectLocks.java b/src/main/java/com/googlesource/gerrit/plugins/lfs/locks/LfsProjectLocks.java
index 4526fa4..e8987f9 100644
--- a/src/main/java/com/googlesource/gerrit/plugins/lfs/locks/LfsProjectLocks.java
+++ b/src/main/java/com/googlesource/gerrit/plugins/lfs/locks/LfsProjectLocks.java
@@ -43,19 +43,13 @@
 
   private static final FluentLogger log = FluentLogger.forEnclosingClass();
   private final LfsGson gson;
-  private final PathToLockId toLockId;
   private final String project;
   private final Path locksPath;
   private final Cache<String, LfsLock> locks;
 
   @Inject
-  LfsProjectLocks(
-      LfsGson gson,
-      PathToLockId toLockId,
-      LfsLocksPathProvider locksPath,
-      @Assisted Project.NameKey project) {
+  LfsProjectLocks(LfsGson gson, LfsLocksPathProvider locksPath, @Assisted Project.NameKey project) {
     this.gson = gson;
-    this.toLockId = toLockId;
     this.project = project.get();
     this.locksPath = Paths.get(locksPath.get(), this.project);
     this.locks = CacheBuilder.newBuilder().build();
@@ -94,7 +88,7 @@
 
   LfsLock createLock(CurrentUser user, LfsCreateLockInput input) throws LfsException {
     log.atFine().log("Create lock for %s in project %s", input.path, project);
-    String lockId = toLockId.apply(input.path);
+    String lockId = PathToLockId.CONVERTER.convert(input.path);
     LfsLock lock = locks.getIfPresent(lockId);
     if (lock != null) {
       throw new LfsLockExistsException(lock);
diff --git a/src/main/java/com/googlesource/gerrit/plugins/lfs/locks/PathToLockId.java b/src/main/java/com/googlesource/gerrit/plugins/lfs/locks/PathToLockId.java
index d90ebb8..4449469 100644
--- a/src/main/java/com/googlesource/gerrit/plugins/lfs/locks/PathToLockId.java
+++ b/src/main/java/com/googlesource/gerrit/plugins/lfs/locks/PathToLockId.java
@@ -14,16 +14,22 @@
 
 package com.googlesource.gerrit.plugins.lfs.locks;
 
-import com.google.common.base.Function;
-import com.google.common.hash.HashCode;
+import static java.nio.charset.StandardCharsets.UTF_8;
+
 import com.google.common.hash.Hashing;
 import com.google.common.io.BaseEncoding;
-import java.nio.charset.StandardCharsets;
 
-public class PathToLockId implements Function<String, String> {
-  @Override
-  public String apply(String path) {
-    HashCode hash = Hashing.sha256().hashString(path, StandardCharsets.UTF_8);
-    return BaseEncoding.base16().lowerCase().encode(hash.asBytes());
+public class PathToLockId {
+  private PathToLockId() {}
+
+  @FunctionalInterface
+  public interface PathToLockIdInterface {
+    String convert(String path);
   }
+
+  static final PathToLockIdInterface CONVERTER =
+      path ->
+          BaseEncoding.base16()
+              .lowerCase()
+              .encode(Hashing.sha256().hashString(path, UTF_8).asBytes());
 }
diff --git a/src/main/resources/static/gr-lfs.html b/src/main/resources/static/gr-lfs.html
index 8493051..1a82aa8 100644
--- a/src/main/resources/static/gr-lfs.html
+++ b/src/main/resources/static/gr-lfs.html
@@ -20,8 +20,6 @@
 <dom-module id="gr-lfs">
   <script>
     Gerrit.install(plugin => {
-      if (!window.Polymer) { return; }
-
       plugin.registerCustomComponent('repo-config', 'gr-lfs-project-info');
     });
   </script>
diff --git a/src/main/resources/static/lfs-project-info.js b/src/main/resources/static/lfs-project-info.js
deleted file mode 100644
index f81f975..0000000
--- a/src/main/resources/static/lfs-project-info.js
+++ /dev/null
@@ -1,74 +0,0 @@
-// Copyright (C) 2016 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.
-
-Gerrit.install(function(self) {
-
-  if (window.Polymer) { return; }
-
-  // The code below is only used by the GWT-UI
-
-  function toUpperCamel(str) {
-    var words = str.split('_');
-    for (i=0; i<words.length; i++) {
-      words[i] = words[i].charAt(0).toUpperCase() + words[i].slice(1);
-    }
-    return words.join(' ');
-  }
-
-  function createRow(doc, name, value) {
-    var tr = doc.createElement('tr');
-    var td = doc.createElement('td');
-    td.appendChild(doc.createTextNode(toUpperCamel(name) + ':'));
-    tr.appendChild(td);
-    td = doc.createElement('td');
-    td.appendChild(doc.createTextNode(value));
-    tr.appendChild(td);
-    return tr;
-  }
-
-  function onProjectInfo(panel) {
-    var url = 'projects/'
-      + encodeURI(panel.p.PROJECT_NAME).replace(/\//g, '%2F') //escape slashes
-      + '/' + this.pluginName + '~'
-      + 'lfs:config-project';
-
-    Gerrit.get(url, function(lfs) {
-      // Don't show LFS header if nothing is configured
-      if (Object.getOwnPropertyNames(lfs).length < 1) {
-        return;
-      }
-
-      var doc = document;
-      // create header
-      var td = doc.createElement('td');
-      td.appendChild(Gerrit.html(
-        '<div class=\"smallHeading\">LFS Options</div>'));
-      var tr = doc.createElement('tr');
-      tr.appendChild(td);
-      var table = doc.createElement('table');
-      table.appendChild(tr);
-
-      // add all properties
-      for (var name in lfs) {
-        table.appendChild(createRow(doc, name, lfs[name]));
-      }
-
-      var frg = doc.createDocumentFragment();
-      frg.appendChild(table);
-      panel.body.appendChild(frg);
-    });
-  }
-
-  self.panel('PROJECT_INFO_SCREEN_BOTTOM', onProjectInfo);
-  });
diff --git a/src/test/java/com/googlesource/gerrit/plugins/lfs/LfsDateTimeTest.java b/src/test/java/com/googlesource/gerrit/plugins/lfs/LfsDateTimeTest.java
deleted file mode 100644
index e2852c5..0000000
--- a/src/test/java/com/googlesource/gerrit/plugins/lfs/LfsDateTimeTest.java
+++ /dev/null
@@ -1,32 +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.lfs;
-
-import static com.google.common.truth.Truth.assertThat;
-
-import java.time.Instant;
-import org.joda.time.DateTime;
-import org.joda.time.format.ISODateTimeFormat;
-import org.junit.Test;
-
-public class LfsDateTimeTest {
-  @Test
-  public void format() throws Exception {
-    DateTime now = DateTime.now();
-    String jodaFormat = ISODateTimeFormat.dateTime().withZoneUTC().print(now);
-    String javaFormat = LfsDateTime.format(Instant.ofEpochMilli(now.getMillis()));
-    assertThat(javaFormat).isEqualTo(jodaFormat);
-  }
-}
diff --git a/src/test/java/com/googlesource/gerrit/plugins/lfs/auth/LfsAuthTokenTest.java b/src/test/java/com/googlesource/gerrit/plugins/lfs/auth/LfsAuthTokenTest.java
index bdf7c21..f527aab 100644
--- a/src/test/java/com/googlesource/gerrit/plugins/lfs/auth/LfsAuthTokenTest.java
+++ b/src/test/java/com/googlesource/gerrit/plugins/lfs/auth/LfsAuthTokenTest.java
@@ -15,6 +15,7 @@
 package com.googlesource.gerrit.plugins.lfs.auth;
 
 import static com.google.common.truth.Truth.assertThat;
+import static com.google.common.truth.Truth8.assertThat;
 
 import com.googlesource.gerrit.plugins.lfs.LfsDateTime;
 import java.time.Instant;
@@ -33,7 +34,7 @@
     String serialized = processor.serialize(token);
     assertThat(serialized).isNotEmpty();
     Optional<TestToken> deserialized = processor.deserialize(serialized);
-    assertThat(deserialized.isPresent()).isTrue();
+    assertThat(deserialized).isPresent();
     assertThat(token.issued).isEqualTo(deserialized.get().issued);
   }
 
diff --git a/src/test/java/com/googlesource/gerrit/plugins/lfs/auth/LfsCipherTest.java b/src/test/java/com/googlesource/gerrit/plugins/lfs/auth/LfsCipherTest.java
index 08d8dc8..3072767 100644
--- a/src/test/java/com/googlesource/gerrit/plugins/lfs/auth/LfsCipherTest.java
+++ b/src/test/java/com/googlesource/gerrit/plugins/lfs/auth/LfsCipherTest.java
@@ -15,44 +15,44 @@
 package com.googlesource.gerrit.plugins.lfs.auth;
 
 import static com.google.common.truth.Truth.assertThat;
+import static com.google.common.truth.Truth8.assertThat;
 
 import java.util.Optional;
 import org.junit.Test;
 
 public class LfsCipherTest {
+  private static final String PLAIN_TEXT = "plain text";
+
   private final LfsCipher cipher = new LfsCipher();
 
   @Test
   public void testCipherTextIsDifferentThanInput() throws Exception {
-    String plain = "plain text";
-    String encrypted = cipher.encrypt(plain);
+    String encrypted = cipher.encrypt(PLAIN_TEXT);
     assertThat(encrypted).isNotEmpty();
-    assertThat(encrypted).isNotEqualTo(plain);
+    assertThat(encrypted).isNotEqualTo(PLAIN_TEXT);
   }
 
   @Test
   public void testVerifyDecodeAgainstEncodedInput() throws Exception {
-    String plain = "plain text";
-    String encrypted = cipher.encrypt(plain);
+    String encrypted = cipher.encrypt(PLAIN_TEXT);
     Optional<String> decrypted = cipher.decrypt(encrypted);
-    assertThat(decrypted.isPresent()).isTrue();
-    assertThat(decrypted.get()).isEqualTo(plain);
+    assertThat(decrypted).isPresent();
+    assertThat(decrypted.get()).isEqualTo(PLAIN_TEXT);
   }
 
   @Test
   public void testVerifyDecodeAgainstInvalidInput() throws Exception {
-    String plain = "plain text";
-    String encrypted = cipher.encrypt(plain);
+    String encrypted = cipher.encrypt(PLAIN_TEXT);
     // there is a chance that two first chars in token are the same
     // in such case re-generate the token
     while (encrypted.charAt(0) == encrypted.charAt(1)) {
-      encrypted = cipher.encrypt(plain);
+      encrypted = cipher.encrypt(PLAIN_TEXT);
     }
 
     Optional<String> decrypted =
         cipher.decrypt(
             encrypted.substring(1, 2) + encrypted.substring(0, 1) + encrypted.substring(2));
-    assertThat(decrypted.isPresent()).isTrue();
-    assertThat(decrypted.get()).isNotEqualTo(plain);
+    assertThat(decrypted).isPresent();
+    assertThat(decrypted.get()).isNotEqualTo(PLAIN_TEXT);
   }
 }