diff --git a/tox.ini b/tox.ini
index 399e8c90..cd4ccdd1 100644
--- a/tox.ini
+++ b/tox.ini
@@ -23,15 +23,19 @@ whitelist_externals = npm
 commands = python manage.py test octavia_dashboard --settings=octavia_dashboard.tests.settings
 
 [testenv:pep8]
+basepython = python3
 commands = flake8
 
 [testenv:venv]
+basepython = python3
 commands = {posargs}
 
 [testenv:cover]
+basepython = python3
 commands = python setup.py test --coverage --testr-args='{posargs}'
 
 [testenv:docs]
+basepython = python3
 whitelist_externals = rm
 deps =
     -c{env:UPPER_CONSTRAINTS_FILE:https://git.openstack.org/cgit/openstack/requirements/plain/upper-constraints.txt}
@@ -43,6 +47,7 @@ commands =
 
 
 [testenv:releasenotes]
+basepython = python3
 whitelist_externals = rm
 deps =
     -c{env:UPPER_CONSTRAINTS_FILE:https://git.openstack.org/cgit/openstack/requirements/plain/upper-constraints.txt}
@@ -53,15 +58,18 @@ commands =
     sphinx-build -a -E -W -d releasenotes/build/doctrees -b html releasenotes/source releasenotes/build/html
 
 [testenv:debug]
+basepython = python3
 commands = oslo_debug_helper {posargs}
 
 [testenv:eslint]
+basepython = python3
 # npm must be installed on the system, for example
 # sudo apt-get install npm
 commands = npm install
            npm run lint
 
 [testenv:karma]
+basepython = python3
 # npm must be installed on the system, for example
 # sudo apt-get install npm
 commands = npm install