diff --git a/Gemfile.lock b/Gemfile.lock
index 6a6c9af..ba7b796 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -171,7 +171,7 @@ GEM
     matrix (0.4.2)
     method_source (1.0.0)
     mini_mime (1.1.5)
-    minitest (5.20.0)
+    minitest (5.21.1)
     minitest-rails (6.1.1)
       minitest (~> 5.10)
       railties (~> 6.1.0)