diff --git a/tools/build-docs.sh b/tools/build-docs.sh
index 5e6ac0c..bc7d4ed 100755
--- a/tools/build-docs.sh
+++ b/tools/build-docs.sh
@@ -56,7 +56,7 @@ EOF
         echo -n "| " >> $LANG_INDEX
         HAS_LANG=1
         get_lang_name_prog=$(dirname $0)/get-lang-display-name.py
-        name=`python $get_lang_name_prog $language`
+        name=`python3 $get_lang_name_prog $language`
         echo "\`$name <__BASE__/${language}/__INDEX__>\`__" >> $LANG_INDEX
     done
 
diff --git a/tools/check-zanata-users-list.sh b/tools/check-zanata-users-list.sh
index 3f9f0e8..434da3a 100755
--- a/tools/check-zanata-users-list.sh
+++ b/tools/check-zanata-users-list.sh
@@ -19,7 +19,7 @@ fi
 TMPFILE=`mktemp`
 trap "rm -f $TMPFILE" EXIT
 
-python tools/zanata/zanata_users.py --output-file $TMPFILE
+python3 tools/zanata/zanata_users.py --output-file $TMPFILE
 if ! diff -u $TEAM_LIST $TMPFILE; then
     set -x
     cat <<EOF
diff --git a/tools/zanata/zanata_stats.py b/tools/zanata/zanata_stats.py
index 0f0dcc0..41b6858 100755
--- a/tools/zanata/zanata_stats.py
+++ b/tools/zanata/zanata_stats.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
diff --git a/tools/zanata/zanata_userinfo.py b/tools/zanata/zanata_userinfo.py
index 4f06f86..cb94376 100755
--- a/tools/zanata/zanata_userinfo.py
+++ b/tools/zanata/zanata_userinfo.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
diff --git a/tools/zanata/zanata_users.py b/tools/zanata/zanata_users.py
index 4fc3c10..8cecc74 100755
--- a/tools/zanata/zanata_users.py
+++ b/tools/zanata/zanata_users.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
diff --git a/tox.ini b/tox.ini
index 66625a5..8748cbb 100644
--- a/tox.ini
+++ b/tox.ini
@@ -4,6 +4,7 @@ envlist = docs,pep8
 skipsdist = True
 
 [testenv]
+basepython=python3
 install_command = pip install -c{env:UPPER_CONSTRAINTS_FILE:https://git.openstack.org/cgit/openstack/requirements/plain/upper-constraints.txt} {opts} {packages}
 usedevelop = True
 setenv = VIRTUAL_ENV={envdir}
@@ -62,7 +63,6 @@ max-line-length = 80
 ignore = D000
 
 [testenv:lower-constraints]
-basepython = python3
 deps =
   -c{toxinidir}/lower-constraints.txt
   -r{toxinidir}/test-requirements.txt