diff --git a/tools/configure.py b/tools/configure.py
old mode 100644
new mode 100755
index f3c34311..45d9824a
--- a/tools/configure.py
+++ b/tools/configure.py
@@ -1,4 +1,4 @@
-#!/usr/bin/python3
+#!/usr/bin/env python3
 
 import os
 from pathlib import Path
diff --git a/tools/m2ctx.py b/tools/m2ctx.py
index f2275e33..7c20c34a 100755
--- a/tools/m2ctx.py
+++ b/tools/m2ctx.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 import sys
 import pyperclip
diff --git a/tools/ninja_syntax.py b/tools/ninja_syntax.py
index 2aa8456e..e0716e8a 100644
--- a/tools/ninja_syntax.py
+++ b/tools/ninja_syntax.py
@@ -1,5 +1,3 @@
-#!/usr/bin/python
-
 # Copyright 2011 Google Inc. All Rights Reserved.
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
diff --git a/tools/setup.py b/tools/setup.py
old mode 100644
new mode 100755
index f81ca25d..6e83c64a
--- a/tools/setup.py
+++ b/tools/setup.py
@@ -1,3 +1,5 @@
+#!/usr/bin/env python3
+
 import requests
 import zipfile
 import io
diff --git a/tools/sha1.py b/tools/sha1.py
old mode 100644
new mode 100755
index 8cd6edd8..fd1cbda8
--- a/tools/sha1.py
+++ b/tools/sha1.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 from pathlib import Path
 import argparse