diff --git a/Gemfile b/Gemfile
index a7d712a..177c20b 100644
--- a/Gemfile
+++ b/Gemfile
@@ -1,4 +1,4 @@
-source :rubygems
+source 'https://rubygems.org'
 
 # Specify your gem's dependencies in middleman-deploy.gemspec
 gemspec