diff --git a/Gemfile b/Gemfile
index a1b93f3..fa75df1 100644
--- a/Gemfile
+++ b/Gemfile
@@ -1,3 +1,3 @@
-source :rubygems
+source 'https://rubygems.org'
 
 gemspec
diff --git a/Gemfile.lock b/Gemfile.lock
index 5561f0a..ed23bc5 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -4,7 +4,7 @@ PATH
     signature (0.1.6)
 
 GEM
-  remote: http://rubygems.org/
+  remote: https://rubygems.org/
   specs:
     bacon (1.1.0)
     diff-lcs (1.1.3)