diff --git a/Gemfile.lock b/Gemfile.lock
index ef55a4d..dc117d7 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -69,7 +69,7 @@ GEM
     json (1.8.1)
     libwebsocket (0.1.5)
       addressable
-    mail (2.5.4)
+    mail (2.5.5)
       mime-types (~> 1.16)
       treetop (~> 1.4.8)
     mime-types (1.25.1)