diff --git a/Gemfile.lock b/Gemfile.lock
index e48fff7..f98212d 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -33,7 +33,7 @@ GEM
     erubis (2.7.0)
     i18n (0.7.0)
     json (1.8.3)
-    mail (2.5.4)
+    mail (2.5.5)
       mime-types (~> 1.16)
       treetop (~> 1.4.8)
     mime-types (1.25.1)