diff --git a/appengine/flexible/hello_world/Gemfile.lock b/appengine/flexible/hello_world/Gemfile.lock
index 590c1aba8..7884e53f8 100644
--- a/appengine/flexible/hello_world/Gemfile.lock
+++ b/appengine/flexible/hello_world/Gemfile.lock
@@ -9,7 +9,7 @@ GEM
     nio4r (2.7.4)
     puma (6.6.0)
       nio4r (~> 2.0)
-    rack (3.1.16)
+    rack (3.1.20)
     rack-protection (4.1.1)
       base64 (>= 0.1.0)
       logger (>= 1.6.0)