diff --git a/tests/Gemfile.lock b/tests/Gemfile.lock
index 9655e4a..28f7427 100644
--- a/tests/Gemfile.lock
+++ b/tests/Gemfile.lock
@@ -28,7 +28,7 @@ GEM
       racc (~> 1.4)
     public_suffix (5.0.4)
     racc (1.8.1)
-    rack (3.0.16)
+    rack (3.1.18)
     rack-test (2.1.0)
       rack (>= 1.3)
     rake (13.0.6)