diff --git a/Gemfile.lock b/Gemfile.lock
index 8f08bc2..0080223 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -11,7 +11,7 @@ GEM
       bundler (>= 1.2.0, < 3)
       thor (~> 1.0)
     docile (1.3.4)
-    minitest (5.15.0)
+    minitest (5.18.0)
     parallel (1.19.2)
     parser (2.7.2.0)
       ast (~> 2.4.1)