diff --git a/tox.ini b/tox.ini
index 2ac52c2..5094429 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,13 +1,14 @@
 # For more information about tox, see https://tox.readthedocs.io/en/latest/
 [tox]
 isolated_build = true
-envlist = py{310,311,312,313,314,314t}-pytest{7,8},pypy3,check,format
+envlist = py{310,311,312,313,314,314t}-pytest{7,8,9},pypy3,check,format
 
 [testenv]
 commands = pytest {posargs:tests}
 deps =
     pytest7: pytest>=7.0.0,<8.0.0
     pytest8: pytest>=8.0.0,<9.0.0
+    pytest9: pytest>=9.0.0,<10.0.0
     pytest-cov
 
 [testenv:check]