diff --git a/init-host.py b/init-host.py
index e3b30c24..24fb12b9 100755
--- a/init-host.py
+++ b/init-host.py
@@ -1,4 +1,4 @@
-#!/usr/bin/python
+#!/usr/bin/python3
 
 # import argparse
 import os
diff --git a/scripts/competition.py b/scripts/competition.py
index 7f5fa767..231736c9 100755
--- a/scripts/competition.py
+++ b/scripts/competition.py
@@ -1,4 +1,4 @@
-#!/usr/bin/python
+#!/usr/bin/python3
 
 import argparse
 import datetime
diff --git a/scripts/inject.py b/scripts/inject.py
index 911e23a7..6e31a156 100755
--- a/scripts/inject.py
+++ b/scripts/inject.py
@@ -1,4 +1,4 @@
-#!/usr/bin/python
+#!/usr/bin/python3
 
 import argparse
 import atexit
diff --git a/scripts/run-on-fuzzed-input.py b/scripts/run-on-fuzzed-input.py
index 76bc4213..f14805fd 100755
--- a/scripts/run-on-fuzzed-input.py
+++ b/scripts/run-on-fuzzed-input.py
@@ -1,4 +1,4 @@
-#!/usr/bin/python
+#!/usr/bin/python3
 
 import argparse
 import json
diff --git a/tools/btrace/sw-btrace-to-compiledb b/tools/btrace/sw-btrace-to-compiledb
index ff914320..1a55ee6c 100755
--- a/tools/btrace/sw-btrace-to-compiledb
+++ b/tools/btrace/sw-btrace-to-compiledb
@@ -1,5 +1,4 @@
-#!/usr/bin/env python
-# Python 2 or 3 -- works on 2.6 and up.
+#!/usr/bin/python3
 from __future__ import absolute_import, print_function, unicode_literals
 import json
 import os