diff --git a/actionmailer/actionmailer.gemspec b/actionmailer/actionmailer.gemspec
index 8d6475cea9..410df0e106 100644
--- a/actionmailer/actionmailer.gemspec
+++ b/actionmailer/actionmailer.gemspec
@@ -20,6 +20,6 @@
   s.has_rdoc = true
 
   s.add_dependency('actionpack',  version)
-  s.add_dependency('mail',        '~> 2.1.5.2')
+  s.add_dependency('mail',        '~> 2.1.5.3')
   s.add_dependency('text-format', '~> 1.0.0')
 end