diff --git a/tox.ini b/tox.ini
index 4864e30..b25ea47 100644
--- a/tox.ini
+++ b/tox.ini
@@ -17,6 +17,7 @@ whitelist_externals = bash
 passenv = *_proxy *_PROXY
 
 [testenv:debug]
+basepython = python3
 commands = oslo_debug_helper {posargs}
 
 [testenv:debug-py27]
@@ -28,12 +29,14 @@ basepython = python3.5
 commands = oslo_debug_helper {posargs}
 
 [testenv:pep8]
+basepython = python3
 commands =
   flake8 {posargs}
   # Run security linter
   bandit -c bandit.yaml -r glare -n5
 
 [testenv:cover]
+basepython = python3
 setenv =
     {[testenv]setenv}
     PYTHON=coverage run --source glare --parallel-mode  --omit="*/test*"
@@ -44,23 +47,27 @@ commands =
     coverage xml -o cover/coverage.xml
 
 [testenv:venv]
+basepython = python3
 commands = {posargs}
 
 [testenv:genconfig]
+basepython = python3
 commands =
   oslo-config-generator --config-file etc/oslo-config-generator/glare.conf
 
 [testenv:genpolicy]
+basepython = python3
 sitepackages = False
 envdir = {toxworkdir}/venv
 commands =
   oslopolicy-sample-generator --namespace=glare --output-file=etc/policy.yaml.sample
 
 [testenv:docs]
-basepython = python2.7
+basepython = python3
 commands = python setup.py build_sphinx
 
 [testenv:bandit]
+basepython = python3
 usedevelop = False
 commands = bandit -c bandit.yaml -r glare -n5 {posargs}