diff --git a/pyproject.toml b/pyproject.toml
index c29b27a..ebeaa5c 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -44,7 +44,7 @@ dev = [
     "pyright>=1.1.356",
     "pytest==8.3.3",
     "ruff==0.6.7",
-    "tox==4.18.1",
+    "tox==4.20.0",
 ]
 
 [tool.pdm.resolution.overrides]