diff --git a/Gemfile.lock b/Gemfile.lock
index 6e4671968..9ad091be7 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -237,7 +237,7 @@ GEM
       builder
       minitest (>= 5.0)
       ruby-progressbar
-    mocha (2.4.5)
+    mocha (2.5.0)
       ruby2_keywords (>= 0.0.5)
     msgpack (1.7.2)
     net-imap (0.5.0)