diff --git a/Gemfile.lock b/Gemfile.lock
index d5a78f1116..842d25dd1b 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -411,7 +411,7 @@ GEM
     minitest (5.25.1)
     msgpack (1.7.5)
     multi_json (1.15.0)
-    mutex_m (0.2.0)
+    mutex_m (0.3.0)
     net-http (0.5.0)
       uri
     net-imap (0.5.1)