diff --git a/tox.ini b/tox.ini
index 4a268ce..3d6c740 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,10 +1,8 @@
 [tox]
-minversion = 3.1.1
+minversion = 3.18.0
 envlist = pep8,py3
-ignore_basepython_conflict = True
 
 [testenv]
-basepython = python3
 usedevelop = True
 setenv = VIRTUAL_ENV={envdir}
          LANGUAGE=en_US