diff --git a/data/Witherspoon.py b/data/Witherspoon.py
index d5dab6a..e106eb9 100755
--- a/data/Witherspoon.py
+++ b/data/Witherspoon.py
@@ -1,4 +1,4 @@
-#! /usr/bin/python
+#!/usr/bin/env python3
 
 # System states
 # state can change to next state in 2 ways: