diff --git a/examples/google_app_engine/flask/app.yaml b/examples/google_app_engine/flask/app.yaml
index dfe7de530..ecc2ab272 100644
--- a/examples/google_app_engine/flask/app.yaml
+++ b/examples/google_app_engine/flask/app.yaml
@@ -1,4 +1,4 @@
-runtime: python38
+runtime: python311
 
 inbound_services:
   - warmup