diff --git a/appengine/flexible/ruby31-and-earlier/rails-cloudsql-postgres/Gemfile.lock b/appengine/flexible/ruby31-and-earlier/rails-cloudsql-postgres/Gemfile.lock
index c51ad93f4..20e94210c 100644
--- a/appengine/flexible/ruby31-and-earlier/rails-cloudsql-postgres/Gemfile.lock
+++ b/appengine/flexible/ruby31-and-earlier/rails-cloudsql-postgres/Gemfile.lock
@@ -186,7 +186,7 @@ GEM
     public_suffix (5.0.3)
     puma (3.12.6)
     racc (1.7.3)
-    rack (2.2.8)
+    rack (2.2.8.1)
     rack-test (2.1.0)
       rack (>= 1.3)
     rails (5.2.8.1)