diff --git a/binder/views.py b/binder/views.py
index b8166326..332b4829 100644
--- a/binder/views.py
+++ b/binder/views.py
@@ -2325,8 +2325,17 @@ def _multi_put_override_superclass(self, objects):
 		# Collect overrides
 		for (cls, mid), data in objects.items():
 			for subcls in getsubclasses(cls):
+				# Get remote field of the subclass
+				remote_field = subcls._meta.pk.remote_field
+
+				# In some scenarios with proxy models
+				# The remote field may not exist
+				# Because proxy models are just pure python wrappers(without its own db table) for other models
+				if remote_field is None:
+					continue
+
 				# Get key of field pointing to subclass
-				subkey = subcls._meta.pk.remote_field.name
+				subkey = remote_field.name
 				# Get id of subclass
 				subid = data.pop(subkey, None)
 				if subid is None:
diff --git a/docker-compose.yml b/docker-compose.yml
index 5e890a8a..b0aeb0c7 100644
--- a/docker-compose.yml
+++ b/docker-compose.yml
@@ -1,5 +1,3 @@
-version: '3'
-
 services:
   db:
     image: postgres:11.5
diff --git a/setup.py b/setup.py
index b2174ccc..a7f8936b 100755
--- a/setup.py
+++ b/setup.py
@@ -36,7 +36,7 @@
 		'Topic :: Internet :: WWW/HTTP :: Dynamic Content',
 	],
 	install_requires=[
-		'Django >= 3.0, < 5.0',
+		'Django >= 3.0, < 4.0',
 		'Pillow >= 3.2.0',
 		'django-request-id >= 1.0.0',
 		'requests >= 2.13.0',
diff --git a/tests/test_inheritance.py b/tests/test_inheritance.py
index 6cc8cf15..7deb1cd2 100644
--- a/tests/test_inheritance.py
+++ b/tests/test_inheritance.py
@@ -122,3 +122,24 @@ def test_create_lion_with_animal_and_zoo(self):
 		zoo = Zoo.objects.get(pk=zoo_id)
 		zoo_animal_ids = [animal.id for animal in zoo.animals.all()]
 		self.assertEqual(zoo_animal_ids, [animal_id])
+
+	def test_multiput_class_that_has_proxy_subclass(self):
+		response = self.client.put(
+			'/animal/',
+			content_type='application/json',
+			data=json.dumps({
+				'data': [{
+					'id': -1,
+					'name': 'Kowalsky',
+				}],
+				'with': {
+					'zoo': [{
+						'id': -3,
+						'name': 'Artis',
+						'animals': [-1],
+					}],
+				},
+			}),
+		)
+
+		self.assertEqual(response.status_code, 200)
diff --git a/tests/testapp/models/__init__.py b/tests/testapp/models/__init__.py
index 93af8bc6..f03ff3bb 100644
--- a/tests/testapp/models/__init__.py
+++ b/tests/testapp/models/__init__.py
@@ -16,6 +16,7 @@
 from .city import City, CityState, PermanentCity
 from .country import Country
 from .web_page import WebPage
+from .pet import Pet
 
 # This is Postgres-specific
 if os.environ.get('BINDER_TEST_MYSQL', '0') != '1':
diff --git a/tests/testapp/models/pet.py b/tests/testapp/models/pet.py
new file mode 100644
index 00000000..48b3b0bf
--- /dev/null
+++ b/tests/testapp/models/pet.py
@@ -0,0 +1,7 @@
+from binder.models import BinderModel
+
+from .animal import Animal
+
+class Pet(Animal):
+    class Meta(BinderModel.Meta):
+        proxy = True
diff --git a/tests/testapp/views/__init__.py b/tests/testapp/views/__init__.py
index 000623a2..31fb1049 100644
--- a/tests/testapp/views/__init__.py
+++ b/tests/testapp/views/__init__.py
@@ -21,3 +21,4 @@
 from .zoo_employee import ZooEmployeeView
 from .web_page import WebPageView
 from .donor import DonorView
+from .pet import PetView
diff --git a/tests/testapp/views/pet.py b/tests/testapp/views/pet.py
new file mode 100644
index 00000000..d55ac301
--- /dev/null
+++ b/tests/testapp/views/pet.py
@@ -0,0 +1,6 @@
+from binder.views import ModelView
+
+from ..models import Pet
+
+class PetView(ModelView):
+	model = Pet