diff --git a/Gemfile.lock b/Gemfile.lock
index 4ba1109..4438736 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -17,7 +17,7 @@ GEM
     simplecov_json_formatter (0.1.4)
     syntax_tree (6.2.0)
       prettier_print (>= 1.2.0)
-    test-unit (3.6.3)
+    test-unit (3.6.4)
       power_assert
 
 PLATFORMS