diff --git a/actionpack/actionpack.gemspec b/actionpack/actionpack.gemspec
index 44967631ffee7b816d4907f94817958dec7420a7..b7d1d8c2afd0d3786c03bc01cdc484580c70b2ca 100644
--- a/actionpack/actionpack.gemspec
+++ b/actionpack/actionpack.gemspec
@@ -23,7 +23,7 @@
   s.add_dependency('activemodel',      version)
   s.add_dependency('rack-cache',       '~> 0.5.3')
   s.add_dependency('builder',          '~> 3.0.0')
-  s.add_dependency('i18n',             '~> 0.4.2')
+  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-mount',       '~> 0.6.13')
diff --git a/activemodel/activemodel.gemspec b/activemodel/activemodel.gemspec
index 318d71a610ec982328f5c3b7a64b524bfb0b18d4..1f38e70c36dbf9082dd6d628d1c51eacf416b50e 100644
--- a/activemodel/activemodel.gemspec
+++ b/activemodel/activemodel.gemspec
@@ -21,5 +21,5 @@
 
   s.add_dependency('activesupport', version)
   s.add_dependency('builder',       '~> 3.0.0')
-  s.add_dependency('i18n',          '~> 0.4.2')
+  s.add_dependency('i18n',          '~> 0.5.0')
 end