diff --git a/tox.ini b/tox.ini
index 6c2ab50..1bbccd4 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,13 +1,9 @@
 [tox]
-minversion = 3.18.0
+minversion = 4.4
 envlist = pep8,py3
-ignore_basepython_conflict = true
 
 [testenv]
-basepython = python3
 usedevelop = True
-setenv =
-   VIRTUAL_ENV={envdir}
 deps = -c{env:TOX_CONSTRAINTS_FILE:https://releases.openstack.org/constraints/upper/master}
        -r{toxinidir}/requirements.txt
        -r{toxinidir}/test-requirements.txt