diff --git a/tox.ini b/tox.ini
index fb6f611f..7f08913b 100644
--- a/tox.ini
+++ b/tox.ini
@@ -35,7 +35,7 @@ commands =
     pylint --rcfile=pylintrc --extension-pkg-whitelist=numpy --ignore=tests neurom
 
 [testenv:docs]
-basepython=python3.8
+basepython=python3.9
 changedir = doc
 extras = docs
 commands =