diff --git a/Gemfile_rails4.lock b/Gemfile_rails4.lock
index 4fb81a0684..a549209519 100644
--- a/Gemfile_rails4.lock
+++ b/Gemfile_rails4.lock
@@ -153,7 +153,7 @@ GEM
     mail (2.5.4)
       mime-types (~> 1.16)
       treetop (~> 1.4.8)
-    message_bus (0.9.3.2)
+    message_bus (0.9.4)
       eventmachine
       rack (>= 1.1.3)
       redis