diff --git a/backend/metagenedb/apps/catalog/serializers/bulk_list.py b/backend/metagenedb/apps/catalog/serializers/bulk_list.py
index 6bd4f26807e9ee1bd626320b0c084c88efa8500d..4643630a465257be6f9e43e12fc5805fa147d5a7 100644
--- a/backend/metagenedb/apps/catalog/serializers/bulk_list.py
+++ b/backend/metagenedb/apps/catalog/serializers/bulk_list.py
@@ -25,4 +25,4 @@ class BulkListSerializer(serializers.ListSerializer):
         return instances
 
     class Meta:
-        model = NotImplemented
\ No newline at end of file
+        model = NotImplemented
diff --git a/backend/metagenedb/apps/catalog/serializers/test_bulk_list.py b/backend/metagenedb/apps/catalog/serializers/test_bulk_list.py
index e1d396865e3f168775ba5b98624906a0ee76a61a..9c39a1ac8b1ca19fea683fe9796b5449e2317fbf 100644
--- a/backend/metagenedb/apps/catalog/serializers/test_bulk_list.py
+++ b/backend/metagenedb/apps/catalog/serializers/test_bulk_list.py
@@ -1,7 +1,6 @@
 from copy import deepcopy
 from unittest import TestCase
 from unittest.mock import Mock
-from rest_framework import serializers
 
 from metagenedb.apps.catalog.serializers.bulk_list import BulkListSerializer
 
@@ -24,7 +23,6 @@ class TestExtractManyToMany(TestCase):
         ]
         self.bulk_list_serializer = BulkListSerializerTestExtractManyToMany()
         self.info = Mock()
-        
 
     def test_extract_many_to_many(self):
         self.info.relations = {