diff --git a/oauth2.gemspec b/oauth2.gemspec
index 7f075a2b..6f447f2c 100644
--- a/oauth2.gemspec
+++ b/oauth2.gemspec
@@ -8,7 +8,7 @@ Gem::Specification.new do |spec|
   spec.add_dependency 'faraday', '~> 0.8'
   spec.add_dependency 'multi_json', '~> 1.0'
   spec.add_dependency 'multi_xml', '~> 0.5'
-  spec.add_dependency 'rack', '~> 1.2'
+  spec.add_dependency 'rack', '>= 0.1'
   spec.add_dependency 'jwt', '~> 0.1.4'
   spec.authors       = ["Michael Bleigh", "Erik Michaels-Ober"]
   spec.cert_chain    = %w(certs/sferik.pem)