diff --git a/demos/userns-block-fd.py b/demos/userns-block-fd.py
index 4c68242..2ef2fd6 100755
--- a/demos/userns-block-fd.py
+++ b/demos/userns-block-fd.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 import os, select, subprocess, sys, json
 
diff --git a/tests/test-run.sh b/tests/test-run.sh
index a01f41c..535e9b6 100755
--- a/tests/test-run.sh
+++ b/tests/test-run.sh
@@ -226,7 +226,7 @@ fi
 # Test --die-with-parent
 
 cat >lockf-n.py <<EOF
-#!/usr/bin/env python
+#!/usr/bin/env python3
 import struct,fcntl,sys
 path = sys.argv[1]
 if sys.argv[2] == 'wait':