diff --git a/pyproject.toml b/pyproject.toml
index 1fa90be..15ad2d7 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -20,7 +20,7 @@ typing-extensions = ">=4.13.2"
 [tool.poetry.dev-dependencies]
 pytest = ">=8.3.5"
 pytest-cov = ">=5.0.0"
-tox = ">= 3.9.0"
+tox = ">=4.25.0"
 flake8 = ">=5.0.4"
 types-python-dateutil = ">= 2.8.19.14"
 mypy = ">=1.14.1"