diff --git a/Gemfile.lock b/Gemfile.lock
index 98af170..64133d0 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -54,7 +54,7 @@ GEM
       thor (>= 0.14, < 2.0)
     json (1.8.6)
     libv8 (3.16.14.19)
-    mail (2.5.4)
+    mail (2.5.5)
       mime-types (~> 1.16)
       treetop (~> 1.4.8)
     mime-types (1.25.1)