diff --git a/doc/changelog.rst b/doc/changelog.rst
index f0eb46e6..6456d4a7 100644
--- a/doc/changelog.rst
+++ b/doc/changelog.rst
@@ -3,6 +3,10 @@ Changelog
 
 .. currentmodule:: motor.motor_tornado
 
+Motor 3.5.2
+-----------
+- Update the PyMongo dependency requirement to >=4.5 and <4.9. Apps that require PyMongo >=4.9 must upgrade to Motor >=3.6.
+
 Motor 3.5.1
 -----------
 - Fix runtime behavior of Motor generic class typing, e.g. ``client: AsyncIOMotorClient[Dict[str, Any]]``.
diff --git a/requirements.txt b/requirements.txt
index 45c42ede..ff5779ae 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1 +1 @@
-pymongo>=4.5,<5
+pymongo>=4.5,<4.9
diff --git a/test/asyncio_tests/test_asyncio_collection.py b/test/asyncio_tests/test_asyncio_collection.py
index beaccebf..5d34766d 100644
--- a/test/asyncio_tests/test_asyncio_collection.py
+++ b/test/asyncio_tests/test_asyncio_collection.py
@@ -26,7 +26,6 @@
 from bson import CodecOptions
 from bson.binary import JAVA_LEGACY
 from pymongo import ReadPreference, WriteConcern
-from pymongo.encryption import Algorithm, QueryType
 from pymongo.errors import BulkWriteError, DuplicateKeyError, OperationFailure
 from pymongo.read_concern import ReadConcern
 from pymongo.read_preferences import Secondary
@@ -304,7 +303,7 @@ async def test_async_encrypt_expression(self):
                 insert_payload = await client_encryption.encrypt(
                     float(i),
                     key_id=data_key,
-                    algorithm=Algorithm.RANGEPREVIEW,
+                    algorithm="range",
                     contention_factor=0,
                     range_opts=range_opts,
                 )
@@ -323,8 +322,8 @@ async def test_async_encrypt_expression(self):
                     ]
                 },
                 key_id=data_key,
-                algorithm=Algorithm.RANGEPREVIEW,
-                query_type=QueryType.RANGEPREVIEW,
+                algorithm="range",
+                query_type="range",
                 contention_factor=0,
                 range_opts=range_opts,
             )
diff --git a/test/tornado_tests/test_motor_collection.py b/test/tornado_tests/test_motor_collection.py
index 7f183aba..48cd06b4 100644
--- a/test/tornado_tests/test_motor_collection.py
+++ b/test/tornado_tests/test_motor_collection.py
@@ -25,7 +25,6 @@
 from bson import CodecOptions
 from bson.binary import JAVA_LEGACY
 from pymongo import ReadPreference, WriteConcern
-from pymongo.encryption import Algorithm, QueryType
 from pymongo.errors import BulkWriteError, DuplicateKeyError, OperationFailure
 from pymongo.read_concern import ReadConcern
 from pymongo.read_preferences import Secondary
@@ -306,7 +305,7 @@ async def test_async_encrypt_expression(self):
                 insert_payload = await client_encryption.encrypt(
                     float(i),
                     key_id=data_key,
-                    algorithm=Algorithm.RANGEPREVIEW,
+                    algorithm="range",
                     contention_factor=0,
                     range_opts=range_opts,
                 )
@@ -325,8 +324,8 @@ async def test_async_encrypt_expression(self):
                     ]
                 },
                 key_id=data_key,
-                algorithm=Algorithm.RANGEPREVIEW,
-                query_type=QueryType.RANGEPREVIEW,
+                algorithm="range",
+                query_type="range",
                 contention_factor=0,
                 range_opts=range_opts,
             )