diff --git a/github-markup.gemspec b/github-markup.gemspec
index 69e10b45..93b00b1c 100644
--- a/github-markup.gemspec
+++ b/github-markup.gemspec
@@ -16,7 +16,6 @@ Gem::Specification.new do |s|
   s.test_files    = s.files.grep(%r{^(test|spec|features)/})
   s.require_paths = %w[lib]
 
-  s.add_dependency "rinku"
   s.add_development_dependency 'rake', '~> 12'
   s.add_development_dependency 'activesupport', '~> 4.0'
   s.add_development_dependency 'minitest', '~> 5.4', '>= 5.4.3'