diff --git a/Gemfile b/Gemfile
index 40728ccb..683f35c7 100644
--- a/Gemfile
+++ b/Gemfile
@@ -1,4 +1,4 @@
-source :rubygems
+source 'https://rubygems.org'
 
 gemspec
 
diff --git a/Gemfile.lock b/Gemfile.lock
index 9064c75e..0a758f94 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -33,7 +33,7 @@ PATH
       activemodel (>= 4.0.0.beta, < 4.1)
 
 GEM
-  remote: http://rubygems.org/
+  remote: https://rubygems.org/
   specs:
     atomic (1.0.1)
     builder (3.1.4)