diff --git a/tools/add-projects-to-main.py b/tools/add-projects-to-main.py
index f661ea9b69..585e189124 100644
--- a/tools/add-projects-to-main.py
+++ b/tools/add-projects-to-main.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 # Copyright 2017 Red Hat, Inc.
 #
diff --git a/tools/batch_update_projects.py b/tools/batch_update_projects.py
index c6e4680407..b623f699c3 100644
--- a/tools/batch_update_projects.py
+++ b/tools/batch_update_projects.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 # Licensed under the Apache License, Version 2.0 (the "License"); you may
 # not use this file except in compliance with the License. You may obtain
diff --git a/tools/check_gerrit_projects_changed.py b/tools/check_gerrit_projects_changed.py
index 16be494fe1..b751829ae3 100644
--- a/tools/check_gerrit_projects_changed.py
+++ b/tools/check_gerrit_projects_changed.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 #
 # Check that gerrit/projects.yaml changes are valid.
 #
diff --git a/tools/check_gerrit_projects_changed.sh b/tools/check_gerrit_projects_changed.sh
index 55bd5610e8..a65c05f1bd 100755
--- a/tools/check_gerrit_projects_changed.sh
+++ b/tools/check_gerrit_projects_changed.sh
@@ -13,7 +13,7 @@ cp gerrit/projects.yaml gerrit/projects-old.yaml
 # check_gerrit_projects_changed.py invocation might be an old version.
 git checkout $GITHEAD
 
-python tools/check_gerrit_projects_changed.py gerrit/projects-old.yaml \
+python3 tools/check_gerrit_projects_changed.py gerrit/projects-old.yaml \
     gerrit/projects.yaml
 
 rm gerrit/projects-old.yaml
diff --git a/tools/check_irc_access.py b/tools/check_irc_access.py
index 8de0e6eee3..a538d967e3 100755
--- a/tools/check_irc_access.py
+++ b/tools/check_irc_access.py
@@ -1,4 +1,4 @@
-#! /usr/bin/env python
+#! /usr/bin/env python3
 
 # Copyright 2011, 2013-2014 OpenStack Foundation
 # Copyright 2012 Hewlett-Packard Development Company, L.P.
diff --git a/tools/check_valid_gerrit_projects.py b/tools/check_valid_gerrit_projects.py
index 88ef793e51..8bebffb0f2 100755
--- a/tools/check_valid_gerrit_projects.py
+++ b/tools/check_valid_gerrit_projects.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 #
 # Check that gerrit/projects.yaml contains valid entries.
 #
diff --git a/tools/ci2project.py b/tools/ci2project.py
index 371b0b2381..fb8b2fe981 100644
--- a/tools/ci2project.py
+++ b/tools/ci2project.py
@@ -1,4 +1,4 @@
-#! /usr/bin/env python
+#! /usr/bin/env python3
 
 # Copyright 2014 OpenStack Foundation
 #
diff --git a/tools/fix-neutron-stadium.py b/tools/fix-neutron-stadium.py
index 17a8bbb783..bd63797279 100644
--- a/tools/fix-neutron-stadium.py
+++ b/tools/fix-neutron-stadium.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 # Copyright 2017 Red Hat, Inc.
 #
diff --git a/tools/irc_tests.py b/tools/irc_tests.py
index 0d4a3f1a19..b1e34a4c81 100755
--- a/tools/irc_tests.py
+++ b/tools/irc_tests.py
@@ -1,4 +1,4 @@
-#! /usr/bin/env python
+#! /usr/bin/env python3
 
 # Copyright 2015 SUSE Linux GmbH
 #
diff --git a/tools/normalize_acl.py b/tools/normalize_acl.py
index fcfbcfab03..cd71d31fb3 100755
--- a/tools/normalize_acl.py
+++ b/tools/normalize_acl.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 #  Licensed under the Apache License, Version 2.0 (the "License"); you may
 #  not use this file except in compliance with the License. You may obtain
 #  a copy of the License at
diff --git a/tools/normalize_channels_yaml.py b/tools/normalize_channels_yaml.py
index e11b11cedb..ff2c645810 100755
--- a/tools/normalize_channels_yaml.py
+++ b/tools/normalize_channels_yaml.py
@@ -1,4 +1,4 @@
-#! /usr/bin/env python
+#! /usr/bin/env python3
 #
 # Copyright (c) 2015 Hewlett-Packard Development Company, L.P.
 #
diff --git a/tools/normalize_projects_yaml.py b/tools/normalize_projects_yaml.py
index 26e42732b1..951363aa8f 100755
--- a/tools/normalize_projects_yaml.py
+++ b/tools/normalize_projects_yaml.py
@@ -1,4 +1,4 @@
-#! /usr/bin/env python
+#! /usr/bin/env python3
 #
 # Copyright (c) 2015 Hewlett-Packard Development Company, L.P.
 #
diff --git a/tools/zuul-projects-checks.py b/tools/zuul-projects-checks.py
index c65a55cd18..5f3482b4c7 100755
--- a/tools/zuul-projects-checks.py
+++ b/tools/zuul-projects-checks.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 # Copyright 2017 SUSE Linux GmbH
 #