diff --git a/util/cpt_upgrader.py b/util/cpt_upgrader.py
index 96dcaf6fd4..98875e33d9 100755
--- a/util/cpt_upgrader.py
+++ b/util/cpt_upgrader.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 # Copyright (c) 2012-2013,2015-2016, 2020 ARM Limited
 # All rights reserved