diff --git a/stripe.gemspec b/stripe.gemspec
index 6b1296bf..5c8ebe3b 100644
--- a/stripe.gemspec
+++ b/stripe.gemspec
@@ -13,7 +13,7 @@ spec = Gem::Specification.new do |s|
   s.license = 'MIT'
 
   s.add_dependency('rest-client', '~> 1.4')
-  s.add_dependency('mime-types', '~> 1.25')
+  s.add_dependency('mime-types', '>= 1.25', '< 3.0')
   s.add_dependency('json', '~> 1.8.1')
 
   s.add_development_dependency('mocha', '~> 0.13.2')