diff --git a/Gemfile.lock b/Gemfile.lock
index 735a5025..f14f4912 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -10,7 +10,7 @@ GEM
     ast (2.4.2)
     docile (1.4.0)
     json (2.6.3)
-    minitest (5.17.0)
+    minitest (5.18.0)
     parallel (1.22.1)
     parser (3.2.1.0)
       ast (~> 2.4.1)