diff --git a/appengine/flexible/ruby31-and-earlier/static_files/sinatra/Gemfile.lock b/appengine/flexible/ruby31-and-earlier/static_files/sinatra/Gemfile.lock
index f4ae5a8e0..f60f8276b 100644
--- a/appengine/flexible/ruby31-and-earlier/static_files/sinatra/Gemfile.lock
+++ b/appengine/flexible/ruby31-and-earlier/static_files/sinatra/Gemfile.lock
@@ -34,7 +34,7 @@ GEM
     puma (5.6.8)
       nio4r (~> 2.0)
     racc (1.7.3)
-    rack (3.2.3)
+    rack (3.2.5)
     rack-protection (4.2.0)
       base64 (>= 0.1.0)
       logger (>= 1.6.0)