diff --git a/api_taster.gemspec b/api_taster.gemspec
index 6f5666b..77e543e 100644
--- a/api_taster.gemspec
+++ b/api_taster.gemspec
@@ -14,7 +14,7 @@ Gem::Specification.new do |s|
   s.files      = `git ls-files`.split($\)
   s.test_files = Dir["spec/**/*"]
 
-  s.add_dependency 'rails', '~> 4.0.0'
+  s.add_dependency 'rails', '>= 4.0'
   s.add_dependency 'jquery-rails'
   s.add_dependency 'sass-rails'
   s.add_dependency 'bootstrap-sass', '~> 2.1'