diff --git a/Gemfile.lock b/Gemfile.lock
index b17c2350..310e3f71 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -39,7 +39,7 @@ GEM
     multi_test (0.1.2)
     os (1.0.0)
     power_assert (1.1.3)
-    rack (2.0.6)
+    rack (2.0.9.3)
     rake (12.3.1)
     test-unit (3.2.8)
       power_assert