diff --git a/zero-rails_openapi.gemspec b/zero-rails_openapi.gemspec
index 67a1ca6..ace83b1 100644
--- a/zero-rails_openapi.gemspec
+++ b/zero-rails_openapi.gemspec
@@ -31,7 +31,7 @@ Gem::Specification.new do |spec|
 
   spec.add_dependency 'colorize'
   spec.add_dependency 'activesupport', '>= 4.1'
-  spec.add_dependency 'rails', '>= 4.1'
+  spec.add_dependency 'railties', '>= 4.1'
 
   # spec.post_install_message = ""
 end