diff --git a/tox.ini b/tox.ini
index a82368f..1bb3360 100644
--- a/tox.ini
+++ b/tox.ini
@@ -34,12 +34,15 @@ basepython = python2.7
 commands = python manage.py test heat_dashboard.test.integration --settings=heat_dashboard.test.settings --tag integration
 
 [testenv:pep8]
+basepython = python3
 commands = flake8 {posargs}
 
 [testenv:venv]
+basepython = python3
 commands = {posargs}
 
 [testenv:cover]
+basepython = python3
 commands =
   coverage erase
   coverage run --source=heat_dashboard {toxinidir}/manage.py test heat_dashboard.test.tests --settings=heat_dashboard.test.settings {posargs}
@@ -53,11 +56,13 @@ commands =
   {[unit_tests]commands}
 
 [testenv:docs]
+basepython = python3
 deps = -c{env:UPPER_CONSTRAINTS_FILE:https://git.openstack.org/cgit/openstack/requirements/plain/upper-constraints.txt}
        -r{toxinidir}/doc/requirements.txt
 commands = python setup.py build_sphinx
 
 [testenv:releasenotes]
+basepython = python3
 deps = -c{env:UPPER_CONSTRAINTS_FILE:https://git.openstack.org/cgit/openstack/requirements/plain/upper-constraints.txt}
        -r{toxinidir}/doc/requirements.txt
 commands = sphinx-build -a -E -W -d releasenotes/build/doctrees -b html releasenotes/source releasenotes/build/html
@@ -77,6 +82,7 @@ max-complexity = 20
 import-order-style = pep8
 
 [testenv:npm]
+basepython = python3
 passenv =
   HOME
   DISPLAY