diff --git a/tox.ini b/tox.ini
index 051669003..f69209d38 100644
--- a/tox.ini
+++ b/tox.ini
@@ -20,23 +20,29 @@ commands =
 passenv = http_proxy HTTP_PROXY https_proxy HTTPS_PROXY no_proxy NO_PROXY
 
 [testenv:pep8]
+basepython = python3
 commands = flake8
 
 [testenv:genconfig]
+basepython = python3
 commands = oslo-config-generator --config-file=etc/vitrage/vitrage-config-generator.conf
 
 [testenv:genpolicy]
+basepython = python3
 commands = oslopolicy-sample-generator --config-file=etc/vitrage/vitrage-policy-generator.conf
 
 [testenv:venv]
+basepython = python3
 commands = {posargs}
 
 [testenv:cover]
+basepython = python3
 commands =
     python setup.py testr --coverage --testr-args='{posargs}'
     coverage report
 
 [testenv:docs]
+basepython = python3
 deps =
     -c{env:UPPER_CONSTRAINTS_FILE:https://git.openstack.org/cgit/openstack/requirements/plain/upper-constraints.txt}
         -r{toxinidir}/requirements.txt
@@ -44,6 +50,7 @@ deps =
 commands = sphinx-build -W -b html doc/source doc/build/html
 
 [testenv:debug]
+basepython = python3
 commands = oslo_debug_helper {posargs}
 
 [flake8]
@@ -63,6 +70,7 @@ local-check-factory = vitrage.hacking.checks.factory
 import_exceptions = vitrage.i18n
 
 [testenv:releasenotes]
+basepython = python3
 deps =
   -c{env:UPPER_CONSTRAINTS_FILE:https://git.openstack.org/cgit/openstack/requirements/plain/upper-constraints.txt}
   -r{toxinidir}/requirements.txt