diff --git a/actionpack/actionpack.gemspec b/actionpack/actionpack.gemspec
index 20becc0bb1..f6bc5e0d37 100644
--- a/actionpack/actionpack.gemspec
+++ b/actionpack/actionpack.gemspec
@@ -25,7 +25,7 @@ Gem::Specification.new do |s|
   s.add_dependency('builder',          '~> 3.0.0')
   s.add_dependency('i18n',             '~> 0.5.0')
   s.add_dependency('rack',             '~> 1.2.1')
-  s.add_dependency('rack-test',        '~> 0.5.6')
+  s.add_dependency('rack-test',        '~> 0.5.7')
   s.add_dependency('rack-mount',       '~> 0.6.13')
   s.add_dependency('tzinfo',           '~> 0.3.23')
   s.add_dependency('erubis',           '~> 2.6.6')