diff --git a/setup.py b/setup.py
index 350a5a0f..05e0b7d3 100644
--- a/setup.py
+++ b/setup.py
@@ -24,6 +24,7 @@
     python_requires=">=3.6",
     install_requires=[
         "python-dateutil>=2.7.0",
+        "types-python-dateutil>=2.8.10",
         "typing_extensions; python_version<'3.8'",
     ],
     classifiers=[