diff --git a/Gemfile.lock b/Gemfile.lock
index 5cbe8ab8..b8a6432f 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -130,7 +130,7 @@ GEM
     mini_portile2 (2.4.0)
     minitest (5.11.3)
     minitest-stub-const (0.6)
-    mocha (1.8.0)
+    mocha (1.9.0)
       metaclass (~> 0.0.1)
     mysql2 (0.5.2)
     nio4r (2.3.1)