diff --git a/tox.ini b/tox.ini
index 487a6717..996b1143 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,9 +1,10 @@
 [tox]
 minversion = 3.18.0
-envlist = docs,py38
+envlist = docs,py3
+ignore_basepython_conflict = True
 
 [testenv]
-basepython = python3
+basepython = {env:TOX_PYTHON:python3}
 usedevelop = True
 setenv =
   VIRTUAL_ENV={envdir}