diff --git a/app/career/views/weekly_business.py b/app/career/views/weekly_business.py
index 657c3af0..80baeffc 100644
--- a/app/career/views/weekly_business.py
+++ b/app/career/views/weekly_business.py
@@ -59,7 +59,7 @@ def create(self, request, *args, **kwargs):
         except ValueError:
             return Response(
                 {"detail": "En feil oppstod under behandlingen av forespørselen."},
-                status=status.HTTP_400_BAD_REQUEST
+                status=status.HTTP_400_BAD_REQUEST,
             )
 
     def update(self, request, pk):
@@ -81,7 +81,7 @@ def update(self, request, pk):
         except ValueError:
             return Response(
                 {"detail": "En feil oppstod under behandlingen av forespørselen."},
-                status=status.HTTP_400_BAD_REQUEST
+                status=status.HTTP_400_BAD_REQUEST,
             )
 
     def destroy(self, request, *args, **kwargs):
diff --git a/app/content/serializers/event.py b/app/content/serializers/event.py
index c97704df..66182916 100644
--- a/app/content/serializers/event.py
+++ b/app/content/serializers/event.py
@@ -1,4 +1,3 @@
-from django.db.models import Q
 from rest_framework import serializers
 
 from dry_rest_permissions.generics import DRYPermissionsField
@@ -326,6 +325,7 @@ def get_allow_photo_count(self, obj, *args, **kwargs):
 
     def get_has_not_paid_count(self, obj, *args, **kwargs):
         if obj.is_paid_event:
-            orders = obj.orders.filter(~Q(status=OrderStatus.SALE), event=obj).count()
-            return orders
+            registrations = obj.registrations.filter(is_on_wait=False).count()
+            orders = obj.orders.filter(status=OrderStatus.SALE, event=obj).count()
+            return registrations - orders
         return 0
diff --git a/app/content/views/upload.py b/app/content/views/upload.py
index b9816e43..d5c9d8b2 100644
--- a/app/content/views/upload.py
+++ b/app/content/views/upload.py
@@ -35,7 +35,7 @@ def upload(request):
     except ValueError:
         return Response(
             {"detail": "En feil oppstod under behandlingen av forespørselen."},
-            status=status.HTTP_400_BAD_REQUEST
+            status=status.HTTP_400_BAD_REQUEST,
         )
 
 
@@ -56,5 +56,5 @@ def delete(_request, container_name, blob_name):
     except ValueError:
         return Response(
             {"detail": "En feil oppstod under behandlingen av forespørselen."},
-            status=status.HTTP_400_BAD_REQUEST
+            status=status.HTTP_400_BAD_REQUEST,
         )
diff --git a/requirements.txt b/requirements.txt
index 20aa30f0..7f1d547f 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -44,7 +44,7 @@ isort
 flake8
 flake8-django
 flake8-black
-pre-commit == 3.8.0
+pre-commit == 4.0.1
 
 # Testing
 # ------------------------------------------------------------------------------