diff --git a/tox.ini b/tox.ini
index 4ba34bb1..61b2f592 100644
--- a/tox.ini
+++ b/tox.ini
@@ -30,6 +30,7 @@ setenv =
 
 
 [testenv:docs]
+basepython = python3
 deps = -r{toxinidir}/doc/requirements.txt
 commands=
     bash -c "rm -rf doc/build"
@@ -43,6 +44,7 @@ extensions = .rst
 
 
 [testenv:releasenotes]
+basepython = python3
 deps = -r{toxinidir}/doc/requirements.txt
 commands =
     sphinx-build -a -E -W -d releasenotes/build/doctrees -b html releasenotes/source releasenotes/build/html
@@ -50,11 +52,13 @@ commands =
 
 # environment used by the -infra templated docs job
 [testenv:venv]
+basepython = python3
 commands =
     {posargs}
 
 
 [testenv:pep8]
+basepython = python3
 commands =
     bash -c "{toxinidir}/tests/common/test-pep8.sh"
 
@@ -67,6 +71,7 @@ ignore=F403
 
 
 [testenv:bashate]
+basepython = python3
 commands =
     bash -c "{toxinidir}/tests/common/test-bashate.sh"
 
@@ -93,6 +98,7 @@ commands =
     bash -c "{toxinidir}/tests/common/test-ansible-functional.sh"
 
 [testenv:upgrade]
+basepython = python3
 setenv =
     {[testenv]setenv}
     TEST_PLAYBOOK={toxinidir}/tests/test-upgrade.yml
@@ -102,6 +108,7 @@ commands =
 
 
 [testenv:func_lxd]
+basepython = python3
 setenv =
     {[testenv]setenv}
     ANSIBLE_OVERRIDES={toxinidir}/tests/os_nova-overrides-lxd.yml
@@ -110,6 +117,7 @@ commands =
 
 
 [testenv:ssl]
+basepython = python3
 setenv =
     {[testenv]setenv}
     ANSIBLE_PARAMETERS=-vvv -e galera_use_ssl=True
@@ -118,6 +126,7 @@ commands =
 
 
 [testenv:linters]
+basepython = python3
 commands =
     bash -c "{toxinidir}/tests/common/test-ansible-env-prep.sh"
     {[testenv:pep8]commands}