diff --git a/setup.py b/setup.py
index dbe798f..b853077 100644
--- a/setup.py
+++ b/setup.py
@@ -33,7 +33,7 @@
       include_package_data=True,
       zip_safe=True,
       install_requires=[
-        "pymongo",
+        "pymongo<4.9",
         "pytz",
       ],
       tests_require=[