diff --git a/Gemfile.lock b/Gemfile.lock
index 8c534eb4c16..f2ec0505d97 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -263,7 +263,7 @@ GEM
     multi_xml (0.7.1)
       bigdecimal (~> 3.1)
     mustache (1.1.1)
-    mutex_m (0.2.0)
+    mutex_m (0.3.0)
     net-http (0.5.0)
       uri
     net-imap (0.5.1)