diff --git a/appengine/standard/helloworld/app.yaml b/appengine/standard/helloworld/app.yaml
index a267f0ca5a..4b1db8f14a 100644
--- a/appengine/standard/helloworld/app.yaml
+++ b/appengine/standard/helloworld/app.yaml
@@ -1,4 +1,4 @@
-runtime: php81
+runtime: php84
 
 # Defaults to "serve index.php" and "serve public/index.php". Can be used to
 # serve a custom PHP front controller (e.g. "serve backend/index.php") or to