diff --git a/serverless-dual-backend/appengine/requirements.txt b/serverless-dual-backend/appengine/requirements.txt
index 31fb29d..664a4ba 100644
--- a/serverless-dual-backend/appengine/requirements.txt
+++ b/serverless-dual-backend/appengine/requirements.txt
@@ -1,2 +1,2 @@
-Flask==1.0.2
+Flask==3.1.3
 google-cloud-datastore==1.7.3