diff --git a/http_router.gemspec b/http_router.gemspec
index 61be69f..0dc6d00 100644
--- a/http_router.gemspec
+++ b/http_router.gemspec
@@ -28,7 +28,7 @@ Gem::Specification.new do |s|
   s.add_development_dependency 'rbench'
   s.add_development_dependency 'json'
   s.add_development_dependency 'phocus'
-  s.add_development_dependency 'bundler',  '~> 1.0.0'
+  s.add_development_dependency 'bundler'
   s.add_development_dependency 'thin',  '= 1.2.8'
 
   if s.respond_to? :specification_version then