diff --git a/Gemfile b/Gemfile
index b0810ca4..b9791555 100644
--- a/Gemfile
+++ b/Gemfile
@@ -1,6 +1,6 @@
 ruby '1.9.3' rescue nil
 
-source :rubygems
+source 'https://rubygems.org'
 gemspec
 
 gem 'travis-core',     github: 'travis-ci/travis-core'
diff --git a/Gemfile.lock b/Gemfile.lock
index d22ac457..416c2b1f 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -102,7 +102,7 @@ PATH
       travis-support
 
 GEM
-  remote: http://rubygems.org/
+  remote: https://rubygems.org/
   specs:
     actionmailer (3.2.12)
       actionpack (= 3.2.12)