diff --git a/Gemfile.lock b/Gemfile.lock
index ead28d6..1faed41 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -42,13 +42,12 @@ GEM
       rdoc
     journey (1.0.4)
     json (1.7.7)
-    mail (2.5.3)
-      i18n (>= 0.4.0)
+    mail (2.5.5)
       mime-types (~> 1.16)
       treetop (~> 1.4.8)
-    mime-types (1.21)
+    mime-types (1.25.1)
     multi_json (1.7.1)
-    polyglot (0.3.3)
+    polyglot (0.3.5)
     rack (1.4.5)
     rack-cache (1.2)
       rack (>= 0.4)
@@ -93,7 +92,7 @@ GEM
       tilt (~> 1.1, != 1.3.0)
     thor (0.17.0)
     tilt (1.3.6)
-    treetop (1.4.12)
+    treetop (1.4.15)
       polyglot
       polyglot (>= 0.3.1)
     tzinfo (0.3.37)