diff --git a/guard-jasmine.gemspec b/guard-jasmine.gemspec
index 166d5ea..4b88097 100644
--- a/guard-jasmine.gemspec
+++ b/guard-jasmine.gemspec
@@ -19,7 +19,7 @@ Gem::Specification.new do |s|
   s.add_dependency 'multi_json', '~> 1.0.3'
   s.add_dependency 'version',    '~> 1.0.0'
   s.add_dependency 'thor',       '~> 0.14.6'
-  s.add_dependency 'rack',       '~> 1.3.5'
+  s.add_dependency 'rack',       '~> 1.4.0'
 
   s.add_development_dependency 'bundler',     '~> 1.0'
   s.add_development_dependency 'guard-rspec', '~> 0.5'