diff --git a/pyproject.toml b/pyproject.toml
index 45102b4b..b8d1799b 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -21,7 +21,7 @@ typing-extensions = ">=4.7.1"
 pytest = ">=9.0.3"
 tox = ">=4.30.3"
 flake8 = ">=7.3.0"
-types-python-dateutil = ">=2.8.19"
+types-python-dateutil = ">=2.9.0.20260807"
 mypy = "1.4.1"