diff --git a/api/funkwhale_api/common/serializers.py b/api/funkwhale_api/common/serializers.py
index b3e2d3101..b995afcaa 100644
--- a/api/funkwhale_api/common/serializers.py
+++ b/api/funkwhale_api/common/serializers.py
@@ -1,4 +1,3 @@
-import collections
 from rest_framework import serializers
 
 
diff --git a/api/funkwhale_api/federation/serializers.py b/api/funkwhale_api/federation/serializers.py
index 451c199ce..44de5d312 100644
--- a/api/funkwhale_api/federation/serializers.py
+++ b/api/funkwhale_api/federation/serializers.py
@@ -769,7 +769,7 @@ class CollectionSerializer(serializers.Serializer):
 
 
 class LibraryTrackActionSerializer(common_serializers.ActionSerializer):
-    actions = [common_serializers.Action('import', allow_all=True)]
+    actions = [common_serializers.Action("import", allow_all=True)]
     filterset_class = filters.LibraryTrackFilter
 
     @transaction.atomic
diff --git a/api/tests/users/test_views.py b/api/tests/users/test_views.py
index 723360193..fca66d302 100644
--- a/api/tests/users/test_views.py
+++ b/api/tests/users/test_views.py
@@ -70,7 +70,7 @@ def test_can_signup_with_invitation(preferences, factories, api_client):
 
 def test_can_signup_with_invitation_invalid(preferences, factories, api_client):
     url = reverse("rest_register")
-    invitation = factories["users.Invitation"](code="hello")
+    factories["users.Invitation"](code="hello")
     data = {
         "username": "test1",
         "email": "test1@test.com",