diff --git a/appengine/flexible_python37_and_earlier/multiple_services/gateway-service/requirements.txt b/appengine/flexible_python37_and_earlier/multiple_services/gateway-service/requirements.txt
index 052021ed812..5cd7a303c00 100644
--- a/appengine/flexible_python37_and_earlier/multiple_services/gateway-service/requirements.txt
+++ b/appengine/flexible_python37_and_earlier/multiple_services/gateway-service/requirements.txt
@@ -2,4 +2,4 @@ Flask==3.0.3; python_version > '3.6'
 Flask==2.3.3; python_version < '3.7'
 gunicorn==23.0.0
 requests==2.31.0
-Werkzeug==3.0.3
+Werkzeug==3.1.5