diff --git a/CHANGELOG.md b/CHANGELOG.md
index fa79029..b4c8d3f 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -3,6 +3,12 @@ All notable changes in pdfminer.six will be documented in this file.
 
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
 
+## Unreleased
+
+### Added
+
+- Python3 shebang line to script in tools ([408](https://github.com/pdfminer/pdfminer.six/pull/408)
+
 ## [20200402]
 
 ### Added
diff --git a/pdfminer/psparser.py b/pdfminer/psparser.py
index 055a3c9..8c13ec4 100644
--- a/pdfminer/psparser.py
+++ b/pdfminer/psparser.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 # -*- coding: utf-8 -*-
 
diff --git a/tests/test_pdfencoding.py b/tests/test_pdfencoding.py
index e03f0ed..62b5790 100644
--- a/tests/test_pdfencoding.py
+++ b/tests/test_pdfencoding.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 # -*- coding: utf-8 -*-
 
diff --git a/tools/conv_afm.py b/tools/conv_afm.py
index 9b6af71..32cea90 100755
--- a/tools/conv_afm.py
+++ b/tools/conv_afm.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 import sys
 import fileinput
diff --git a/tools/conv_cmap.py b/tools/conv_cmap.py
index dbc553e..3f782c8 100755
--- a/tools/conv_cmap.py
+++ b/tools/conv_cmap.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 import sys
 import pickle as pickle
diff --git a/tools/conv_glyphlist.py b/tools/conv_glyphlist.py
index 9423713..f94dcc8 100755
--- a/tools/conv_glyphlist.py
+++ b/tools/conv_glyphlist.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 import sys
 import fileinput
diff --git a/tools/dumppdf.py b/tools/dumppdf.py
index 377e9b4..3136c70 100755
--- a/tools/dumppdf.py
+++ b/tools/dumppdf.py
@@ -1,3 +1,4 @@
+#!/usr/bin/env python3
 """Extract pdf structure in XML format"""
 import logging
 import os.path
diff --git a/tools/pdf2txt.py b/tools/pdf2txt.py
index 7e6f9d7..0637ec4 100755
--- a/tools/pdf2txt.py
+++ b/tools/pdf2txt.py
@@ -1,3 +1,4 @@
+#!/usr/bin/env python3
 """A command line tool for extracting text and images from PDF and
 output it to plain text, html, xml or tags."""
 import argparse
diff --git a/tools/pdfdiff.py b/tools/pdfdiff.py
index c4d578b..8723027 100644
--- a/tools/pdfdiff.py
+++ b/tools/pdfdiff.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 """
 compares rwo pdf files.
diff --git a/tools/prof.py b/tools/prof.py
index 9231872..1654a98 100644
--- a/tools/prof.py
+++ b/tools/prof.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 import sys