diff --git a/rack-attack.gemspec b/rack-attack.gemspec
index 1cd56a0..8c1f1f3 100644
--- a/rack-attack.gemspec
+++ b/rack-attack.gemspec
@@ -26,7 +26,7 @@ Gem::Specification.new do |s|
   s.add_development_dependency 'rack-test'
   s.add_development_dependency 'rake'
   s.add_development_dependency 'activesupport', '>= 3.0.0'
-  s.add_development_dependency 'debugger', '~> 1.1.3'
+  s.add_development_dependency 'debugger', '~> 1.5'
   s.add_development_dependency 'redis-activesupport'
   s.add_development_dependency 'dalli'
 end