diff --git a/Gemfile.lock b/Gemfile.lock
index 97e0c0891..37a755710 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -177,7 +177,7 @@ GEM
       libv8-node (~> 21.7.2.0)
     minitest (5.25.1)
     minitest-stub-const (0.6)
-    mocha (2.6.1)
+    mocha (2.7.1)
       ruby2_keywords (>= 0.0.5)
     mysql2 (0.5.6)
     net-imap (0.4.17)