diff --git a/tox.ini b/tox.ini
index 8854cc67b5..f9336938bb 100644
--- a/tox.ini
+++ b/tox.ini
@@ -23,6 +23,7 @@ commands =
 commands = oslo_debug_helper -t kolla/tests {posargs}
 
 [testenv:cover]
+basepython = python3
 setenv = VIRTUAL_ENV={envdir}
          NOSE_WITH_COVERAGE=1
          NOSE_COVER_BRANCHES=1
@@ -32,6 +33,7 @@ commands = python setup.py testr --coverage --testr-args='{posargs}'
            coverage report --show-missing
 
 [testenv:pep8]
+basepython = python3
 deps =
     {[testenv]deps}
     yamllint
@@ -48,9 +50,11 @@ commands =
 commands = bandit --skip B303 -r docker kolla tests tools
 
 [testenv:venv]
+basepython = python3
 commands = {posargs}
 
 [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
@@ -243,12 +247,14 @@ commands=
   oslo-config-generator --config-file etc/oslo-config-generator/kolla-build.conf
 
 [testenv:releasenotes]
+basepython = python3
 deps = -r{toxinidir}/doc/requirements.txt
 commands =
   rm -rf releasenotes/build
   sphinx-build -a -E -W -d releasenotes/build/doctrees -b html releasenotes/source releasenotes/build/html
 
 [testenv:bindep]
+basepython = python3
 # Do not install any requirements. We want this to be fast and work even if
 # system dependencies are missing, since it's used to tell you what system
 # dependencies are missing! This also means that bindep must be installed