diff --git a/tools/util.py b/tools/util.py
index e8182ed..1d92528 100644
--- a/tools/util.py
+++ b/tools/util.py
@@ -15,9 +15,9 @@
 from os import path
 
 REPO_ROOTS = {
-  'GERRIT': 'http://gerrit-maven.storage.googleapis.com',
+  'GERRIT': 'https://gerrit-maven.storage.googleapis.com',
   'GERRIT_API': 'https://gerrit-api.commondatastorage.googleapis.com/release',
-  'MAVEN_CENTRAL': 'http://repo1.maven.org/maven2',
+  'MAVEN_CENTRAL': 'https://repo1.maven.org/maven2',
   'MAVEN_LOCAL': 'file://' + path.expanduser('~/.m2/repository'),
   'MAVEN_SNAPSHOT': 'https://oss.sonatype.org/content/repositories/snapshots',
 }