diff --git a/HISTORY.rst b/HISTORY.rst
index 3d66511..9ee4ae6 100644
--- a/HISTORY.rst
+++ b/HISTORY.rst
@@ -2,6 +2,15 @@
 History
 =======
 
+3.2.0 (2024-04-30)
+------------------
+
+Features:
+
+* Add compatibility with `pymongo` 4.0.
+* Allow `motor` 4.0 dependency so that `pymongo` 4.x dependency can be used.
+
+
 3.1.0 (2021-12-23)
 ------------------
 
diff --git a/azure-pipelines.yml b/azure-pipelines.yml
index 223868e..725976c 100644
--- a/azure-pipelines.yml
+++ b/azure-pipelines.yml
@@ -25,7 +25,8 @@ stages:
         parameters:
           toxenvs:
             - py39-pymongo
-            - py39-motor
+            - py39-motor2
+            - py39-motor3
             - py39-txmongo
           coverage: true
           pre_test:
@@ -44,10 +45,12 @@ stages:
         parameters:
           toxenvs:
             - py37-pymongo
-            - py37-motor
+            - py37-motor2
+            - py37-motor3
             - py37-txmongo
             - py39-pymongo
-            - py39-motor
+            - py39-motor2
+            - py39-motor3
             - py39-txmongo
           coverage: true
           pre_test:
diff --git a/setup.py b/setup.py
index aa5b05c..1aab81c 100755
--- a/setup.py
+++ b/setup.py
@@ -32,7 +32,7 @@
     python_requires='>=3.7',
     install_requires=requirements,
     extras_require={
-        'motor': ['motor>=2.0,<3.0'],
+        'motor': ['motor>=2.0,<4.0'],
         'txmongo': ['txmongo>=19.2.0'],
         'mongomock': ['mongomock'],
     },
diff --git a/tests/common.py b/tests/common.py
index 047143b..7e598d1 100644
--- a/tests/common.py
+++ b/tests/common.py
@@ -71,13 +71,13 @@ def is_compatible_with(db):
 
 class BaseTest:
 
-    def setup(self):
+    def setup_method(self):
         self.instance = MockedInstance(MockedDB('my_moked_db'))
 
 
 class BaseDBTest:
 
-    def setup(self):
+    def setup_method(self):
         con.drop_database(TEST_DB)
 
 
diff --git a/tests/frameworks/test_txmongo.py b/tests/frameworks/test_txmongo.py
index 98c4b04..74eea77 100644
--- a/tests/frameworks/test_txmongo.py
+++ b/tests/frameworks/test_txmongo.py
@@ -289,9 +289,9 @@ def test_reference(self, classroom_model):
         assert teacher_fetched.name == 'Dr. Brown'
         teacher_fetched = yield course.teacher.fetch(force_reload=True)
         assert teacher_fetched.name == 'M. Strickland'
-        # Test fetch with projection
-        assert course.teacher.fetch(projection={'has_apple': 0},
-                                    force_reload=True).has_apple is None
+        # Test fetch with projection, without `yield`.
+        teacher_fetched = course.teacher.fetch(projection={'has_apple': 0}, force_reload=True)
+        assert isinstance(teacher_fetched, Deferred)
         # Test bad ref as well
         course.teacher = Reference(classroom_model.Teacher, ObjectId())
         with pytest.raises(ma.ValidationError) as exc:
diff --git a/tests/test_document.py b/tests/test_document.py
index fb268a9..c786c87 100644
--- a/tests/test_document.py
+++ b/tests/test_document.py
@@ -36,8 +36,8 @@ class Meta:
 
 class TestDocument(BaseTest):
 
-    def setup(self):
-        super().setup()
+    def setup_method(self):
+        super().setup_method()
         self.instance.register(BaseStudent)
         self.Student = self.instance.register(Student)
         self.EasyIdStudent = self.instance.register(EasyIdStudent)
diff --git a/tests/test_embedded_document.py b/tests/test_embedded_document.py
index 5323c0f..59edc37 100644
--- a/tests/test_embedded_document.py
+++ b/tests/test_embedded_document.py
@@ -60,7 +60,7 @@ class MyDoc(Document):
         d.from_mongo(data={'in_mongo_embedded': {'in_mongo_a': 1, 'b': 2}})
         assert d.dump() == {'embedded': {'a': 1, 'b': 2}}
         embedded = d.get('embedded')
-        assert type(embedded) == MyEmbeddedDocument
+        assert type(embedded) is MyEmbeddedDocument
         assert embedded.a == 1
         assert embedded.b == 2
         assert embedded.dump() == {'a': 1, 'b': 2}
diff --git a/tests/test_marshmallow.py b/tests/test_marshmallow.py
index c3748b6..4bf6730 100644
--- a/tests/test_marshmallow.py
+++ b/tests/test_marshmallow.py
@@ -21,8 +21,8 @@ def teardown_method(self, method):
         # Reset i18n config before each test
         set_gettext(None)
 
-    def setup(self):
-        super().setup()
+    def setup_method(self):
+        super().setup_method()
 
         class User(Document):
             name = fields.StrField()
diff --git a/tox.ini b/tox.ini
index 1e2248a..2f4f9cb 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,5 +1,5 @@
 [tox]
-envlist = lint,{py37,py38,py39}-{motor,pymongo,txmongo}
+envlist = lint,{py37,py38,py39}-{motor2,motor3,pymongo3,pymongo4,txmongo}
 
 [testenv]
 setenv =
@@ -7,8 +7,12 @@ setenv =
 deps =
     pytest>=4.0.0
     coverage>=5.3.0
-    motor: motor>=2.0,<3.0
-    pymongo: mongomock>=3.5.0
+    motor2: motor>=2.0,<3.0
+    motor3: motor>=3.0,<4.0
+    pymongo3: pymongo>3,<4
+    pymongo3: mongomock>=3.5.0
+    pymongo4: pymongo>4,<5
+    pymongo4: mongomock>=3.5.0
     txmongo: pymongo<3.11
     txmongo: txmongo>=19.2.0
     txmongo: pytest-twisted>=1.12