diff --git a/build_info.py b/build_info.py
index 7c1998f6e..06d613b0d 100755
--- a/build_info.py
+++ b/build_info.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 # Copyright (c) 2020 Google Inc.
 #
diff --git a/gen_extension_headers.py b/gen_extension_headers.py
old mode 100644
new mode 100755
index a787f9a9c..2838c9622
--- a/gen_extension_headers.py
+++ b/gen_extension_headers.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 # Copyright (c) 2020 Google Inc.
 #
@@ -95,4 +95,4 @@ def main():
     generate_main(glsl_files, output_file)
 
 if __name__ == '__main__':
-    main()
\ No newline at end of file
+    main()
diff --git a/update_glslang_sources.py b/update_glslang_sources.py
index 65be2f6a2..20f303ba3 100755
--- a/update_glslang_sources.py
+++ b/update_glslang_sources.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 # Copyright 2017 The Glslang Authors. All rights reserved.
 #