diff --git a/templates/script/restart-db-cluster.erb b/templates/script/restart-db-cluster.erb
index 2631a2f..61d2f2f 100755
--- a/templates/script/restart-db-cluster.erb
+++ b/templates/script/restart-db-cluster.erb
@@ -1,4 +1,4 @@
-#!/usr/bin/env python3
+#!/usr/bin/env python3.9
 # vim: set filetype=python:
 
 import sys