diff --git a/Gemfile b/Gemfile
index 510f81d..0f933a9 100644
--- a/Gemfile
+++ b/Gemfile
@@ -19,5 +19,5 @@ gem 'hiera-puppet-helper',
   :git => 'https://github.com/bobtfish/hiera-puppet-helper.git',
   :ref => '5ed989a130bc62cc6bdb923596586284f0bd73df'
 
-gem 'mail', '~> 2.5.4'
+gem 'mail', '~> 2.5.5'
 
diff --git a/Gemfile.lock b/Gemfile.lock
index a2c18cc..c2044cd 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -22,7 +22,7 @@ GEM
       json_pure
     json (1.8.1)
     json_pure (1.8.1)
-    mail (2.5.4)
+    mail (2.5.5)
       mime-types (~> 1.16)
       treetop (~> 1.4.8)
     metaclass (0.0.4)
@@ -64,7 +64,7 @@ PLATFORMS
 DEPENDENCIES
   facter (= 1.7.5)
   hiera-puppet-helper!
-  mail (~> 2.5.4)
+  mail (~> 2.5.5)
   puppet (~> 3.6.2)
   puppetlabs_spec_helper (= 0.4.1)
   rake (= 10.1.0)