diff --git a/tox.ini b/tox.ini
index 45e17be..cf89710 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,9 +1,11 @@
 [tox]
-envlist = py27,py35,pep8
-minversion = 0.1
+envlist = py37,pep8
+minversion = 3.1.1
 skipsdist = True
+ignore_basepython_conflict = True
 
 [testenv]
+basepython = python3
 userdevelop = True
 setenv = VIRTUAL_ENV={envdir}
 deps = -r{toxinidir}/requirements.txt
@@ -12,7 +14,6 @@
            testr run {posargs}
 
 [testenv:pep8]
-basepython = python3
 setenv =
     PYTHONPATH = .
 commands =
@@ -26,7 +27,6 @@
     check-uuid --fix --package heat_tempest_plugin
 
 [testenv:venv]
-basepython = python3
 commands = {posargs}
 
 [flake8]