diff --git a/tox.ini b/tox.ini
index 3ac1671..a6347fc 100644
--- a/tox.ini
+++ b/tox.ini
@@ -44,6 +44,7 @@ commands =
 setenv = OS_FAIL_ON_MISSING_DEPS=1
 
 [testenv:venv]
+basepython = python3
 commands = {posargs}
 
 [testenv:cover]
@@ -74,6 +75,7 @@ deps =
 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}
 
 [flake8]
@@ -86,6 +88,7 @@ exclude=.venv,.git,.tox,dist,doc,*lib/python*,*egg,build,.ropeproject
 import-order-style = pep8
 
 [testenv:bandit]
+basepython = python3
 # B108 hardcoded_tmp_directory - remove when fixed
 # B602 subprocess_popen_with_shell_equals_true - removed when fixed
 # B605 start_process_with_a_shell - remove when fixed