diff --git a/integration_test/simple_app/Gemfile.lock b/integration_test/simple_app/Gemfile.lock
index bda2b77..5a13ec3 100644
--- a/integration_test/simple_app/Gemfile.lock
+++ b/integration_test/simple_app/Gemfile.lock
@@ -81,7 +81,7 @@ GEM
       ruby2_keywords (~> 0.0.1)
     os (1.1.0)
     public_suffix (4.0.5)
-    rack (2.2.2)
+    rack (2.2.8.1)
     rack-protection (2.0.8.1)
       rack
     rly (0.2.3)