diff --git a/aviator.gemspec b/aviator.gemspec
index 8df2ec2..7926940 100644
--- a/aviator.gemspec
+++ b/aviator.gemspec
@@ -19,7 +19,7 @@ Gem::Specification.new do |spec|
   spec.require_paths = ["lib"]
 
   spec.add_dependency 'faraday', '~> 0.8.0'
-  spec.add_dependency 'activesupport', '~> 4.0.0'
+  spec.add_dependency 'activesupport', '>= 3.2.8', '<= 4.0.0'
   spec.add_dependency 'thor', '~> 0.18.1'
   
   spec.add_development_dependency "bundler", "~> 1.3"