diff --git a/Gemfile_rails4.lock b/Gemfile_rails4.lock
index 032e1e4ba7b..d60e9eb3033 100644
--- a/Gemfile_rails4.lock
+++ b/Gemfile_rails4.lock
@@ -246,7 +246,7 @@ GEM
     mocha (0.14.0)
       metaclass (~> 0.0.1)
     mock_redis (0.9.0)
-    msgpack (0.5.6)
+    msgpack (0.5.7)
     multi_json (1.8.2)
     multipart-post (1.2.0)
     mustache (0.99.4)