diff --git a/generate_api_doc.py b/generate_api_doc.py
index d4a006fe..23e47e6d 100644
--- a/generate_api_doc.py
+++ b/generate_api_doc.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 # -*- coding: utf-8 -*-
 
 """ License
diff --git a/generate_function_doc.py b/generate_function_doc.py
index 66b63d8c..d3c92f80 100644
--- a/generate_function_doc.py
+++ b/generate_function_doc.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 # -*- coding: utf-8 -*-
 
 """ License
diff --git a/setup.py b/setup.py
index d7ad31e5..f6ce8829 100755
--- a/setup.py
+++ b/setup.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 import os
 import sys