diff --git a/Gemfile.lock b/Gemfile.lock
index b7985637c..195462a4b 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -262,7 +262,7 @@ GEM
     mini_magick (4.11.0)
     mini_mime (1.1.5)
     mini_portile2 (2.8.5)
-    minitest (5.20.0)
+    minitest (5.21.1)
     money (6.16.0)
       i18n (>= 0.6.4, <= 2)
     msgpack (1.7.2)