diff --git a/Gemfile.lock b/Gemfile.lock
index 884b30978..cc80e4d36 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -9,7 +9,7 @@ GEM
     docile (1.4.0)
     iniparse (1.5.0)
     json (2.7.1)
-    minitest (5.20.0)
+    minitest (5.21.1)
     overcommit (0.61.0)
       childprocess (>= 0.6.3, < 5)
       iniparse (~> 1.4)