diff --git a/setup.py b/setup.py
index 1b0762bb..bddc76b3 100644
--- a/setup.py
+++ b/setup.py
@@ -51,6 +51,7 @@ tests_require = [
     "pytest-mock>=3,<4",
     "pytest-asyncio>=0.16,<2",
     "coveralls>=3.3,<5",
+    "types-python-dateutil>=2.8.1,<3",
 ]
 
 dev_requires = ["ruff==0.5.0"] + tests_require