diff --git a/actionmailer/actionmailer.gemspec b/actionmailer/actionmailer.gemspec
index 0177a13e5003daf07181e714c1898a661cf11492..c3cffc830c3c70d6df1c75b85da968de85c80d94 100644
--- a/actionmailer/actionmailer.gemspec
+++ b/actionmailer/actionmailer.gemspec
@@ -21,5 +21,5 @@
 
   s.add_dependency 'actionpack', version
 
-  s.add_dependency 'mail', '~> 2.4.4'
+  s.add_dependency 'mail', '~> 2.5.0'
 end