diff --git a/tox.ini b/tox.ini
index a8c3710a7..daa2ff872 100644
--- a/tox.ini
+++ b/tox.ini
@@ -14,27 +14,23 @@ commands =
     pytest -vv
 
 [testenv:flake8]
-basepython = python3.8
 deps =
     flake8
 commands = flake8 {posargs}
 
 [testenv:docs]
-basepython = python3.8
 deps =
     -r{toxinidir}/docs/requirements_docs.txt
 commands =
     python setup.py build_sphinx -W
 
 [testenv:towncrier]
-basepython = python3.8
 deps =
     towncrier >= 18.5.0
 commands =
     towncrier {posargs}
 
 [testenv:package]
-basepython = python3.8
 deps =
     wheel
     twine
@@ -43,9 +39,11 @@ commands =
     python -m twine check dist/*
 
 [testenv:publish]
-basepython = python3.8
 deps =
     wheel
     twine
+passenv =
+    TWINE_USERNAME
+    TWINE_PASSWORD
 commands =
     python -m twine upload dist/*