diff --git a/bin/tests/convert-trs-to-junit.py b/bin/tests/convert-trs-to-junit.py
index 85b37dd629..6d7b4aaa1b 100755
--- a/bin/tests/convert-trs-to-junit.py
+++ b/bin/tests/convert-trs-to-junit.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 #
 # Copyright (C) Internet Systems Consortium, Inc. ("ISC")
 #
diff --git a/bin/tests/system/doth/get_openssl_version.py b/bin/tests/system/doth/get_openssl_version.py
index f1d6f4bf00..94cbf5a6bc 100755
--- a/bin/tests/system/doth/get_openssl_version.py
+++ b/bin/tests/system/doth/get_openssl_version.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 # Copyright (C) Internet Systems Consortium, Inc. ("ISC")
 #
diff --git a/bin/tests/system/doth/stress_http_quota.py b/bin/tests/system/doth/stress_http_quota.py
index 05ad043571..ca1fddbcc6 100755
--- a/bin/tests/system/doth/stress_http_quota.py
+++ b/bin/tests/system/doth/stress_http_quota.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 # Copyright (C) Internet Systems Consortium, Inc. ("ISC")
 #
diff --git a/contrib/gitchangelog/gitchangelog.py b/contrib/gitchangelog/gitchangelog.py
index 7193dddc3d..c0d444baf1 100755
--- a/contrib/gitchangelog/gitchangelog.py
+++ b/contrib/gitchangelog/gitchangelog.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 ############################################################################
 # Copyright (c) 2018, Valentin Lab
 # All rights reserved.