diff --git a/tox.ini b/tox.ini
index 8cb36cb1..60142534 100644
--- a/tox.ini
+++ b/tox.ini
@@ -26,7 +26,7 @@ commands =
     pytest -s --cov --cov-report=term-missing --cov-report=html -vv {posargs:}
 
 [testenv:update-readme]
-basepython = {env:TOXPYTHON:python3.10}
+basepython = {env:TOXPYTHON:python3.13}
 setenv =
     {[testenv]setenv}
     BUILD_README=true