diff --git a/backend-project/small_eod/cases/serializers.py b/backend-project/small_eod/cases/serializers.py
index 3344f7083..5a8b31bcd 100644
--- a/backend-project/small_eod/cases/serializers.py
+++ b/backend-project/small_eod/cases/serializers.py
@@ -66,7 +66,6 @@ def create(self, validated_data):
         return case
 
     def update(self, instance, validated_data):
-
         tags = (
             [
                 Tag.objects.get_or_create(name=tag)[0]
diff --git a/backend-project/small_eod/channels/factories.py b/backend-project/small_eod/channels/factories.py
index 67b6b625b..ca04180f8 100644
--- a/backend-project/small_eod/channels/factories.py
+++ b/backend-project/small_eod/channels/factories.py
@@ -6,7 +6,6 @@
 
 
 class ChannelFactory(AbstractTimestampUserFactory, DjangoModelFactory):
-
     name = factory.Sequence(lambda n: "channel-%04d" % n)
     city = FuzzyTrueOrFalse()
     voivodeship = FuzzyTrueOrFalse()
diff --git a/backend-project/small_eod/collections/tests/test_views.py b/backend-project/small_eod/collections/tests/test_views.py
index 24c29511d..cb4d4f2a1 100644
--- a/backend-project/small_eod/collections/tests/test_views.py
+++ b/backend-project/small_eod/collections/tests/test_views.py
@@ -47,7 +47,6 @@ def test_authorize_with_token(self):
 class CollectionViewSetTestCase(
     TokenAuthorizationTestCaseMixin, GenericViewSetMixin, OrderingViewSetMixin, TestCase
 ):
-
     basename = "collection"
     serializer_class = CollectionSerializer
     factory_class = CollectionFactory
@@ -111,7 +110,6 @@ def increase_list(self):
 class CaseCollectionViewSetTestCase(
     TokenAuthorizationTestCaseMixin, ReadOnlyViewSetMixin, TestCase
 ):
-
     basename = "collection-case"
     factory_class = CaseFactory
     queries_less_than_limit = 11
diff --git a/backend-project/small_eod/events/factories.py b/backend-project/small_eod/events/factories.py
index 3a7728293..6e3b9219f 100644
--- a/backend-project/small_eod/events/factories.py
+++ b/backend-project/small_eod/events/factories.py
@@ -7,7 +7,6 @@
 
 
 class EventFactory(AbstractTimestampUserFactory, DjangoModelFactory):
-
     case = factory.SubFactory(CaseFactory)
     date = FuzzyDateTimeFromNow(max_days=10)
     name = factory.Sequence(lambda n: "event-%04d" % n)
diff --git a/backend-project/small_eod/generic/models.py b/backend-project/small_eod/generic/models.py
index 838caafff..180a546f5 100644
--- a/backend-project/small_eod/generic/models.py
+++ b/backend-project/small_eod/generic/models.py
@@ -5,7 +5,6 @@
 
 
 class TimestampUserLogModel(models.Model):
-
     modified_on = models.DateTimeField(
         auto_now=True, verbose_name=_("Date of the modification")
     )
diff --git a/backend-project/small_eod/generic/tests/test_management.py b/backend-project/small_eod/generic/tests/test_management.py
index 0802dcc79..76b1820f6 100644
--- a/backend-project/small_eod/generic/tests/test_management.py
+++ b/backend-project/small_eod/generic/tests/test_management.py
@@ -21,7 +21,6 @@ def test_success_two_run(self):
         )
 
     def test_create_letter(self):
-
         stdout = StringIO()
 
         call_command(
diff --git a/backend-project/small_eod/letters/factories.py b/backend-project/small_eod/letters/factories.py
index a821cde4e..d0b1b4171 100644
--- a/backend-project/small_eod/letters/factories.py
+++ b/backend-project/small_eod/letters/factories.py
@@ -27,7 +27,6 @@ class Meta:
 
 
 class LetterFactory(AbstractTimestampUserFactory, DjangoModelFactory):
-
     final = FuzzyTrueOrFalse()
     date = FuzzyDateTimeFromNow(max_days=10)
     direction = factory.fuzzy.FuzzyChoice(("IN", "OUT"))
diff --git a/backend-project/small_eod/notes/factories.py b/backend-project/small_eod/notes/factories.py
index d98167e60..decaa50c8 100644
--- a/backend-project/small_eod/notes/factories.py
+++ b/backend-project/small_eod/notes/factories.py
@@ -7,7 +7,6 @@
 
 
 class NoteFactory(AbstractTimestampUserFactory, DjangoModelFactory):
-
     case = factory.SubFactory(CaseFactory)
     comment = factory.Sequence(lambda n: "comment-%04d" % n)
 
diff --git a/backend-project/small_eod/tags/factories.py b/backend-project/small_eod/tags/factories.py
index 572d65aaf..5acccb425 100644
--- a/backend-project/small_eod/tags/factories.py
+++ b/backend-project/small_eod/tags/factories.py
@@ -14,7 +14,6 @@ class Meta:
 
 
 class TagNamespaceFactory(AbstractTimestampUserFactory, DjangoModelFactory):
-
     color = RGBColorFuzzyAttribute()
     prefix = factory.Sequence(lambda n: "tag-%04d" % n)
     description = factory.Sequence(lambda n: "desc-%04d" % n)
diff --git a/backend-project/small_eod/users/factories.py b/backend-project/small_eod/users/factories.py
index 1b1c9493c..40f2f7b1d 100644
--- a/backend-project/small_eod/users/factories.py
+++ b/backend-project/small_eod/users/factories.py
@@ -4,7 +4,6 @@
 
 
 class UserFactory(factory.django.DjangoModelFactory):
-
     email = factory.Faker("email", locale="PL")
     username = factory.Sequence("user-{}".format)
     password = factory.PostGenerationMethodCall("set_password", "pass")