diff --git a/appengine/flexible/websockets/Gemfile.lock b/appengine/flexible/websockets/Gemfile.lock
index 9c7b56154..d10c04f23 100644
--- a/appengine/flexible/websockets/Gemfile.lock
+++ b/appengine/flexible/websockets/Gemfile.lock
@@ -37,7 +37,7 @@ GEM
       racc (~> 1.4)
     public_suffix (5.0.3)
     racc (1.7.3)
-    rack (2.2.8)
+    rack (2.2.8.1)
     rack-protection (3.1.0)
       rack (~> 2.2, >= 2.2.4)
     rack-test (2.1.0)