diff --git a/example/tests/integration/test_model_resource_name.py b/example/tests/integration/test_model_resource_name.py
index b2fda333..7f52c5cd 100644
--- a/example/tests/integration/test_model_resource_name.py
+++ b/example/tests/integration/test_model_resource_name.py
@@ -222,6 +222,6 @@ def test_resource_and_relationship_type_match_with_serializer_resource_name_and_
     def teardown_method(self, method):
         models.Comment.__bases__ = (models.Comment.__bases__[0],)
         try:
-            delattr(serializers.CommentSerializer.Meta, "resource_name")
+            del serializers.CommentSerializer.Meta.resource_name
         except AttributeError:
             pass
diff --git a/example/tests/test_views.py b/example/tests/test_views.py
index 47d4adb1..fc9436e1 100644
--- a/example/tests/test_views.py
+++ b/example/tests/test_views.py
@@ -436,7 +436,7 @@ def test_get_serializer_comes_from_included_serializers(self):
         kwargs = {"pk": self.author.id, "related_field": "author_type"}
         view = self._get_view(kwargs)
         related_serializers = view.get_serializer_class().related_serializers
-        delattr(view.get_serializer_class(), "related_serializers")
+        del view.get_serializer_class().related_serializers
         got = view.get_related_serializer_class()
         self.assertEqual(got, AuthorTypeSerializer)
         view.get_serializer_class().related_serializers = related_serializers
diff --git a/requirements/requirements-codestyle.txt b/requirements/requirements-codestyle.txt
index 9f9c37a7..7cf70ce2 100644
--- a/requirements/requirements-codestyle.txt
+++ b/requirements/requirements-codestyle.txt
@@ -1,5 +1,5 @@
-black==25.9.0
+black==26.1.0
 flake8==7.3.0
-flake8-bugbear==24.12.12
-flake8-isort==6.1.2
-isort==6.1.0
+flake8-bugbear==25.11.29
+flake8-isort==7.0.0
+isort==7.0.0
diff --git a/requirements/requirements-optionals.txt b/requirements/requirements-optionals.txt
index 4eb517ff..772cceda 100644
--- a/requirements/requirements-optionals.txt
+++ b/requirements/requirements-optionals.txt
@@ -1,2 +1,2 @@
 django-filter==25.1
-django-polymorphic==4.1.0
+django-polymorphic==4.10.5
diff --git a/requirements/requirements-testing.txt b/requirements/requirements-testing.txt
index 908111fd..d5ad8d44 100644
--- a/requirements/requirements-testing.txt
+++ b/requirements/requirements-testing.txt
@@ -1,7 +1,7 @@
 factory-boy==3.3.3
-Faker==37.8.0
-pytest==8.4.2
+Faker==40.1.2
+pytest==9.0.2
 pytest-cov==7.0.0
 pytest-django==4.11.1
 pytest-factoryboy==2.8.1
-syrupy==4.9.1
+syrupy==5.1.0