diff --git a/actionmailer/actionmailer.gemspec b/actionmailer/actionmailer.gemspec
index 67ec0d109702dfbcf066a88b2c8b4832f9636552..c56b6979efffee0c598f0bb952d4b571dc27fd88 100644
--- a/actionmailer/actionmailer.gemspec
+++ b/actionmailer/actionmailer.gemspec
@@ -21,5 +21,5 @@
 
   s.add_dependency 'actionpack', version
 
-  s.add_dependency 'mail', '~> 2.5.3'
+  s.add_dependency 'mail', '~> 2.5.4'
 end