diff --git a/stripe_event.gemspec b/stripe_event.gemspec
index bc538ac..f801728 100644
--- a/stripe_event.gemspec
+++ b/stripe_event.gemspec
@@ -24,5 +24,5 @@ Gem::Specification.new do |s|
   s.add_development_dependency "rails", [">= 3.1"]
   s.add_development_dependency "rake"
   s.add_development_dependency "rspec-rails"
-  s.add_development_dependency "webmock", "~> 1.9"
+  s.add_development_dependency "webmock"
 end