diff --git a/resque-scheduler.gemspec b/resque-scheduler.gemspec
index e160d6e1..de96c546 100644
--- a/resque-scheduler.gemspec
+++ b/resque-scheduler.gemspec
@@ -22,11 +22,11 @@ Gem::Specification.new do |spec|
 
   spec.add_development_dependency 'bundler', '~> 1.5'
   spec.add_development_dependency 'json'
+  spec.add_development_dependency 'kramdown'
   spec.add_development_dependency 'mocha'
   spec.add_development_dependency 'pry'
   spec.add_development_dependency 'rack-test'
   spec.add_development_dependency 'rake'
-  spec.add_development_dependency 'redcarpet'
   spec.add_development_dependency 'rubocop'
   spec.add_development_dependency 'simplecov'
   spec.add_development_dependency 'yard'