diff --git a/actionpack/actionpack.gemspec b/actionpack/actionpack.gemspec
index f83823dd75..d9b23ad4a9 100644
--- a/actionpack/actionpack.gemspec
+++ b/actionpack/actionpack.gemspec
@@ -21,7 +21,7 @@ Gem::Specification.new do |s|
 
   s.add_dependency 'activesupport', version
 
-  s.add_dependency 'rack',      '~> 1.6.0'
+  s.add_dependency 'rack',      '~> 1.6'
   s.add_dependency 'rack-test', '~> 0.6.2'
   s.add_dependency 'rails-html-sanitizer', '~> 1.0', '>= 1.0.1'
   s.add_dependency 'rails-dom-testing', '~> 1.0', '>= 1.0.5'