diff --git a/app.yaml b/app.yaml
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+# Use PHP 7.3 by replacing "php72" below with "php73"
+runtime: php73
+
+# 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
+# run a long-running PHP script as a worker process (e.g. "php worker.php").
+#
+# entrypoint: serve index.php