diff --git a/setup.py b/setup.py
index 9b3d6de..b5f1efb 100644
--- a/setup.py
+++ b/setup.py
@@ -31,7 +31,7 @@
     install_requires=[
         "dogpile.cache<1.6",
         "importlib-metadata; python_version<'3.8'",
-        "python-dateutil<3.1",
+        "python-dateutil<4.1",
         "requests>=2.27,<3",
         "six<2",
     ],