diff --git a/Gemfile b/Gemfile
index 3ac3ffa4..fa75df15 100644
--- a/Gemfile
+++ b/Gemfile
@@ -1,4 +1,3 @@
 source 'https://rubygems.org'
 
 gemspec
-gem 'rugged', :git => 'https://github.com/libgit2/rugged.git', branch: 'development', submodules: true
diff --git a/github-linguist.gemspec b/github-linguist.gemspec
index d4c2337a..936550f3 100644
--- a/github-linguist.gemspec
+++ b/github-linguist.gemspec
@@ -17,6 +17,7 @@ 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'