diff --git a/pyproject.toml b/pyproject.toml
index 794849a..7115194 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -10,7 +10,7 @@ dependencies = ["salt>=2017"]
 test = ["pylint==2.17.5", "pytest==7.4.0"]
 
 [tool.pdm.dev-dependencies]
-dev = ["black==23.7.0", "pylint==2.17.5", "pytest==7.4.0", "tox==4.8.0"]
+dev = ["black==23.7.0", "pylint==2.17.5", "pytest==7.4.0", "tox==4.9.0"]
 
 [tool.pylint.basic]
 good-names = "a,b,fd,k,v"