diff --git a/tox.ini b/tox.ini
index 694ecce506..d11a1d69e0 100644
--- a/tox.ini
+++ b/tox.ini
@@ -7,7 +7,7 @@ envlist = py38,functional,pep8
 ignore_basepython_conflict = True
 
 [testenv]
-basepython = python3.8
+basepython = python3
 usedevelop = True
 allowlist_externals =
   bash
@@ -342,7 +342,6 @@ commands =
   bindep test
 
 [testenv:lower-constraints]
-basepython = python3.6
 usedevelop = False
 deps =
   -c{toxinidir}/lower-constraints.txt