diff --git a/.github/workflows/github-actions.yml b/.github/workflows/github-actions.yml
index 2d8823c0d..df8d6b25b 100644
--- a/.github/workflows/github-actions.yml
+++ b/.github/workflows/github-actions.yml
@@ -29,6 +29,7 @@ env:
   PYMONGO_4_6: 4.6.2
   PYMONGO_4_7: 4.7.3
   PYMONGO_4_8: 4.8.0
+  PYMONGO_4_9: 4.9
 
   MAIN_PYTHON_VERSION: 3.9
 
@@ -83,6 +84,9 @@ jobs:
           - python-version: "3.11"
             MONGODB: $MONGODB_7_0
             PYMONGO: $PYMONGO_4_8
+          - python-version: "3.11"
+            MONGODB: $MONGODB_7_0
+            PYMONGO: $PYMONGO_4_9
     steps:
     - uses: actions/checkout@v4
     - name: Set up Python ${{ matrix.python-version }}
diff --git a/mongoengine/connection.py b/mongoengine/connection.py
index f64422d28..6a2e754b9 100644
--- a/mongoengine/connection.py
+++ b/mongoengine/connection.py
@@ -4,7 +4,11 @@
 
 from pymongo import MongoClient, ReadPreference, uri_parser
 from pymongo.common import _UUID_REPRESENTATIONS
-from pymongo.database import _check_name
+
+try:
+    from pymongo.database_shared import _check_name
+except ImportError:
+    from pymongo.database import _check_name
 
 # DriverInfo was added in PyMongo 3.7.
 try:
diff --git a/tests/fields/test_datetime_field.py b/tests/fields/test_datetime_field.py
index ced10b1bc..d04f39b04 100644
--- a/tests/fields/test_datetime_field.py
+++ b/tests/fields/test_datetime_field.py
@@ -2,15 +2,15 @@
 
 import pytest
 
+from mongoengine import *
+from mongoengine import connection
+from tests.utils import MongoDBTestCase, get_as_pymongo
+
 try:
     import dateutil
 except ImportError:
     dateutil = None
 
-from mongoengine import *
-from mongoengine import connection
-from tests.utils import MongoDBTestCase, get_as_pymongo
-
 
 class TestDateTimeField(MongoDBTestCase):
     def test_datetime_from_empty_string(self):
diff --git a/tests/queryset/test_queryset_aggregation.py b/tests/queryset/test_queryset_aggregation.py
index f1d504c0b..ecfa0b6f3 100644
--- a/tests/queryset/test_queryset_aggregation.py
+++ b/tests/queryset/test_queryset_aggregation.py
@@ -19,10 +19,11 @@ class Bar(Document):
         bars = Bar.objects.read_preference(
             ReadPreference.SECONDARY_PREFERRED
         ).aggregate(pipeline)
-        assert (
-            bars._CommandCursor__collection.read_preference
-            == ReadPreference.SECONDARY_PREFERRED
-        )
+        if hasattr(bars, "_CommandCursor__collection"):
+            read_pref = bars._CommandCursor__collection.read_preference
+        else:  # pymongo >= 4.9
+            read_pref = bars._collection.read_preference
+        assert read_pref == ReadPreference.SECONDARY_PREFERRED
 
     def test_queryset_aggregation_framework(self):
         class Person(Document):
diff --git a/tests/test_connection.py b/tests/test_connection.py
index 34ecb331b..87af2b517 100644
--- a/tests/test_connection.py
+++ b/tests/test_connection.py
@@ -3,6 +3,8 @@
 import uuid
 
 import pymongo
+import pymongo.database
+import pymongo.mongo_client
 import pytest
 from bson.tz_util import utc
 from pymongo import MongoClient, ReadPreference
@@ -608,7 +610,10 @@ def test_connect_with_replicaset_via_kwargs(self):
         connection kwargs
         """
         c = connect(replicaset="local-rs")
-        assert c._MongoClient__options.replica_set_name == "local-rs"
+        if hasattr(c, "_MongoClient__options"):
+            assert c._MongoClient__options.replica_set_name == "local-rs"
+        else:  # pymongo >= 4.9
+            assert c._options.replica_set_name == "local-rs"
         db = get_db()
         assert isinstance(db, pymongo.database.Database)
         assert db.name == "test"
diff --git a/tox.ini b/tox.ini
index d29267124..0db203642 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,5 +1,5 @@
 [tox]
-envlist = pypy3-{mg34,mg36,mg39,mg311,mg312,mg4,mg432,mg441,mg462,mg473,mg480}
+envlist = pypy3-{mg34,mg36,mg39,mg311,mg312,mg4,mg432,mg441,mg462,mg473,mg480,mg49}
 skipsdist = True
 
 [testenv]
@@ -16,5 +16,6 @@ deps =
     mg462: pymongo>=4.6,<4.7
     mg473: pymongo>=4.7,<4.8
     mg480: pymongo>=4.8,<4.9
+    mg49: pymongo>=4.9,<5.0
 setenv =
     PYTHON_EGG_CACHE = {envdir}/python-eggs