diff --git a/Gemfile.lock b/Gemfile.lock
index 8dbb574..11baaee 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -10,7 +10,7 @@ GEM
     rouge (4.5.1)
     syntax_tree (6.2.0)
       prettier_print (>= 1.2.0)
-    test-unit (3.6.3)
+    test-unit (3.6.4)
       power_assert
 
 PLATFORMS