3 files changed, 3 insertions, 3 deletions
diff --git a/Examples/Tests/collision/analysis_collision_2d.py b/Examples/Tests/collision/analysis_collision_2d.py
index 6c21c362b..ee115722e 100755
--- a/Examples/Tests/collision/analysis_collision_2d.py
+++ b/Examples/Tests/collision/analysis_collision_2d.py
@@ -1,4 +1,4 @@
-#! /usr/bin/env python
+#!/usr/bin/env python3
 
 # Copyright 2019-2020 Yinjian Zhao
 #
diff --git a/Examples/Tests/collision/analysis_collision_3d.py b/Examples/Tests/collision/analysis_collision_3d.py
index 17923c887..0b469f584 100755
--- a/Examples/Tests/collision/analysis_collision_3d.py
+++ b/Examples/Tests/collision/analysis_collision_3d.py
@@ -1,4 +1,4 @@
-#! /usr/bin/env python
+#!/usr/bin/env python3
 
 # Copyright 2019-2020 Yinjian Zhao
 #
diff --git a/Examples/Tests/collision/analysis_collision_rz.py b/Examples/Tests/collision/analysis_collision_rz.py
index 82b2e6da7..72f57eb09 100755
--- a/Examples/Tests/collision/analysis_collision_rz.py
+++ b/Examples/Tests/collision/analysis_collision_rz.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 # Copyright 2019-2021 Yinjian Zhao
 #