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diff --git a/docs/cookbook/container/default.sha256.do b/docs/cookbook/container/default.sha256.do
index d3007e9..b414d02 100644
--- a/docs/cookbook/container/default.sha256.do
+++ b/docs/cookbook/container/default.sha256.do
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
"""Calculate the sha256 digest of a given file."""
import hashlib, os, subprocess, sys
diff --git a/docs/cookbook/container/dockjson.py b/docs/cookbook/container/dockjson.py
index 11a4bec..133a55f 100755
--- a/docs/cookbook/container/dockjson.py
+++ b/docs/cookbook/container/dockjson.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
"""Generate a docker 1.0-style manifest for a docker image."""
import json, os, sys, time
diff --git a/docs/cookbook/container/fileids.py b/docs/cookbook/container/fileids.py
index 68d9982..667c54c 100755
--- a/docs/cookbook/container/fileids.py
+++ b/docs/cookbook/container/fileids.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
import hashlib, os, stat, sys
for name in sys.stdin:
diff --git a/docs/cookbook/container/memcalc.py b/docs/cookbook/container/memcalc.py
index 2301874..7c43e11 100755
--- a/docs/cookbook/container/memcalc.py
+++ b/docs/cookbook/container/memcalc.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
import os, sys
st = os.stat(sys.argv[1])
megabytes = st.st_size // 1024 // 1024
diff --git a/docs/cookbook/defaults/test.py b/docs/cookbook/defaults/test.py
index fa679d2..868cae5 100644
--- a/docs/cookbook/defaults/test.py
+++ b/docs/cookbook/defaults/test.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
"""Test program for auto-generated version.py"""
import version
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