diff --git a/tox.ini b/tox.ini
index a7835efcc..652c9f719 100644
--- a/tox.ini
+++ b/tox.ini
@@ -16,12 +16,15 @@ setenv =
 passenv = http_proxy HTTP_PROXY https_proxy HTTPS_PROXY no_proxy NO_PROXY
 
 [testenv:venv]
+basepython = python3
 commands = {posargs}
 
 [testenv:releasenotes]
+basepython = python3
 commands = sphinx-build -a -E -W -d releasenotes/build/doctrees -b html releasenotes/source releasenotes/build/html
 
 [testenv:cover]
+basepython = python3
 setenv =
     {[testenv]setenv}
     PYTHON=coverage run --branch --omit='*test*' --source ironic_inspector --parallel-mode
@@ -33,7 +36,7 @@ commands =
     coverage html -d ./cover --omit='*test*'
 
 [testenv:pep8]
-basepython = python2.7
+basepython = python3
 commands =
     flake8 ironic_inspector
     doc8 README.rst CONTRIBUTING.rst doc/source
@@ -49,15 +52,18 @@ commands =
     python3 -m ironic_inspector.test.functional
 
 [testenv:genconfig]
+basepython = python3
 envdir = {toxworkdir}/venv
 commands = oslo-config-generator --config-file config-generator.conf
 
 [testenv:genpolicy]
+basepython = python3
 sitepackages = False
 envdir = {toxworkdir}/venv
 commands = oslopolicy-sample-generator --config-file {toxinidir}/policy-generator.conf
 
 [testenv:genstates]
+basepython = python3
 deps = {[testenv]deps}
 commands = {toxinidir}/tools/states_to_dot.py -f {toxinidir}/doc/source/images/states.svg --format svg
 
@@ -78,6 +84,7 @@ application-import-names = ironic_inspector
 import_exceptions = ironicclient.exceptions,ironic_inspector.common.i18n
 
 [testenv:docs]
+basepython = python3
 setenv = PYTHONHASHSEED=0
 sitepackages = False
 deps = -r{toxinidir}/test-requirements.txt