diff --git a/setup.py b/setup.py
index 5557929..04bb11e 100644
--- a/setup.py
+++ b/setup.py
@@ -94,7 +94,7 @@ def get_version(version_file):
         # Version 4.9 introduces the pymongo.synchronous and
         # pymongo.asynchronous namespaces, which are incompatible with this
         # code.  Furthermore, version 4.11 drops support for MongoDB 3.6.
-        "pymongo>=3.7.2,<4.9",
+        "pymongo>=3.7.2,<4.12",
         "PyYAML>=5.1",
         "setuptools",
     ],