diff --git a/3.3/test/rack-test-app/Gemfile.lock b/3.3/test/rack-test-app/Gemfile.lock
index 883bfb2b..e207196b 100644
--- a/3.3/test/rack-test-app/Gemfile.lock
+++ b/3.3/test/rack-test-app/Gemfile.lock
@@ -3,7 +3,7 @@ GEM
   specs:
     mustermann (1.1.1)
       ruby2_keywords (~> 0.0.1)
-    rack (2.2.3)
+    rack (2.2.20)
     rack-protection (2.1.0)
       rack
     ruby2_keywords (0.0.4)