diff --git a/tox.ini b/tox.ini
index 88bc570..603fb35 100644
--- a/tox.ini
+++ b/tox.ini
@@ -3,6 +3,7 @@ basepython = python3.12
 envlist =
     check
     # mypy
+    py313  # EOL 2029-10
     py312  # EOL 2028-10-31
     lxml
     py311  # EOL 2027-10-24
@@ -70,7 +71,7 @@ setenv =
 commands =
     coverage erase
     coverage combine
-    # ENCODING ERRORS ON Windonws: See 
+    # ENCODING ERRORS ON Windonws: See
     # https://github.com/pytest-dev/pytest-html/issues/336#issuecomment-1546864331
     coverage html --directory=build --ignore-errors
     ; coverage xml
@@ -91,7 +92,7 @@ deps =
     ruff
 commands =
     ruff -V
-    ruff check wsgidav tests setup.py 
+    ruff check wsgidav tests setup.py
 
 [testenv:check]
 description = Check Black formatting compliance and add flake8-bugbear checks
@@ -113,8 +114,8 @@ deps =
     {[testenv:check]deps}
 changedir = {toxinidir}
 commands =
-    ruff check --fix wsgidav tests setup.py 
-    ; ruff format wsgidav tests setup.py 
+    ruff check --fix wsgidav tests setup.py
+    ; ruff format wsgidav tests setup.py
     isort --profile black wsgidav tests setup.py {posargs}
     black wsgidav tests setup.py
     {[testenv:lint]commands}