diff --git a/acts_as_tokenizable.gemspec b/acts_as_tokenizable.gemspec
index f6c46d9..6d7e34d 100644
--- a/acts_as_tokenizable.gemspec
+++ b/acts_as_tokenizable.gemspec
@@ -19,7 +19,7 @@ Gem::Specification.new do |gem|
   gem.require_paths = ['lib']
   gem.version = ActsAsTokenizable::VERSION
 
-  gem.add_runtime_dependency 'activerecord', '4.0.0'
+  gem.add_runtime_dependency 'activerecord'
   gem.add_runtime_dependency 'babosa'
 
   gem.add_development_dependency 'rake'