diff --git a/4.0/test/rack-test-app/Gemfile.lock b/4.0/test/rack-test-app/Gemfile.lock
index 47d6d53e..a7bcb8fa 100644
--- a/4.0/test/rack-test-app/Gemfile.lock
+++ b/4.0/test/rack-test-app/Gemfile.lock
@@ -16,7 +16,7 @@ GEM
       rack-protection (= 2.1.0)
       tilt (~> 2.0)
     tilt (2.0.10)
-    webrick (1.7.0)
+    webrick (1.8.2)
 
 PLATFORMS
   ruby