diff --git a/Gemfile.lock b/Gemfile.lock
index 1b8c5f6..97a4484 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -48,7 +48,7 @@ GEM
     hike (1.2.3)
     i18n (0.6.11)
     json (1.8.1)
-    mail (2.5.4)
+    mail (2.5.5)
       mime-types (~> 1.16)
       treetop (~> 1.4.8)
     mime-types (1.25.1)