diff --git a/Gemfile.lock b/Gemfile.lock
index a78394b..b8223b6 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -8,7 +8,7 @@ GEM
   specs:
     power_assert (2.0.1)
     rake (13.0.6)
-    test-unit (3.5.3)
+    test-unit (3.5.5)
       power_assert
 
 PLATFORMS