diff --git a/Gemfile b/Gemfile
index 16470f69..8e2d51ee 100644
--- a/Gemfile
+++ b/Gemfile
@@ -3,8 +3,8 @@ gemspec :name => "jekyll"
 
 gem "rake", "~> 10.1"
 group :development do
-  gem "rubocop"
   gem "launchy", "~> 2.3"
+  gem "rubocop", :branch => :master, :github => "bbatsov/rubocop"
   gem "pry"
 end