diff --git a/Gemfile b/Gemfile
index 851fabc2..ac877cb6 100644
--- a/Gemfile
+++ b/Gemfile
@@ -1,2 +1,3 @@
 source 'https://rubygems.org'
 gemspec
+gem 'rugged', '0.21.1b0'
diff --git a/github-linguist.gemspec b/github-linguist.gemspec
index 936550f3..d4c2337a 100644
--- a/github-linguist.gemspec
+++ b/github-linguist.gemspec
@@ -17,7 +17,6 @@ Gem::Specification.new do |s|
   s.add_dependency 'escape_utils',    '~> 1.0.1'
   s.add_dependency 'mime-types',      '~> 1.19'
   s.add_dependency 'pygments.rb',     '~> 0.6.0'
-  s.add_dependency 'rugged',          '~> 0.21.0'
 
   s.add_development_dependency 'json'
   s.add_development_dependency 'mocha'