diff --git a/Gemfile b/Gemfile
index 25de561c6..e527ba535 100644
--- a/Gemfile
+++ b/Gemfile
@@ -1,4 +1,4 @@
-source :rubygems
+source 'https://rubygems.org'
 
 group :test do
   gem 'rake'
diff --git a/Gemfile.lock b/Gemfile.lock
index fb1a25d37..339e41dc8 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -1,5 +1,5 @@
 GEM
-  remote: http://rubygems.org/
+  remote: https://rubygems.org/
   specs:
     minitest (2.12.1)
     purdytest (1.0.0)