diff --git a/tools/deploy b/tools/deploy
index 1ad14fb..36625fc 100755
--- a/tools/deploy
+++ b/tools/deploy
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 from typing import Any, List, Dict, Callable
 
diff --git a/tools/lint b/tools/lint
index 0d69fa3..913c841 100755
--- a/tools/lint
+++ b/tools/lint
@@ -1,4 +1,4 @@
-#! /usr/bin/env python
+#! /usr/bin/env python3
 
 from __future__ import print_function
 from __future__ import absolute_import
diff --git a/tools/review b/tools/review
index 43a95ec..d90ef3f 100755
--- a/tools/review
+++ b/tools/review
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 from __future__ import print_function
 import subprocess
diff --git a/tools/run-mypy b/tools/run-mypy
index 09fce87..268c35f 100755
--- a/tools/run-mypy
+++ b/tools/run-mypy
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 from __future__ import absolute_import
 from __future__ import print_function
diff --git a/tools/test-botserver b/tools/test-botserver
index 15bb61f..ee9025b 100755
--- a/tools/test-botserver
+++ b/tools/test-botserver
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 from server_lib.test_handler import handle_input_and_run_tests_for_package
 
diff --git a/tools/test-lib b/tools/test-lib
index 3a124ee..4ee0e88 100755
--- a/tools/test-lib
+++ b/tools/test-lib
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 from server_lib.test_handler import handle_input_and_run_tests_for_package
 
diff --git a/tools/test-zulip b/tools/test-zulip
index 838d4da..4d22d74 100755
--- a/tools/test-zulip
+++ b/tools/test-zulip
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 from server_lib.test_handler import handle_input_and_run_tests_for_package
 
diff --git a/zulip/setup.py b/zulip/setup.py
index f2436f5..35e5233 100755
--- a/zulip/setup.py
+++ b/zulip/setup.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 # -*- coding: utf-8 -*-
 
 from __future__ import print_function
diff --git a/zulip/zulip/api_examples.py b/zulip/zulip/api_examples.py
index d5c9d1a..4b4665b 100644
--- a/zulip/zulip/api_examples.py
+++ b/zulip/zulip/api_examples.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 import os
 import zulip
 
diff --git a/zulip/zulip/send.py b/zulip/zulip/send.py
index 9e3c2fe..5e9262c 100755
--- a/zulip/zulip/send.py
+++ b/zulip/zulip/send.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 # -*- coding: utf-8 -*-
 # zulip-send -- Sends a message to the specified recipients.
 
diff --git a/zulip_botserver/setup.py b/zulip_botserver/setup.py
index 4591346..f530329 100644
--- a/zulip_botserver/setup.py
+++ b/zulip_botserver/setup.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 # -*- coding: utf-8 -*-
 
 from __future__ import print_function