diff --git a/backend/time_tracking/serializers.py b/backend/time_tracking/serializers.py
index 7550a50..0394b67 100644
--- a/backend/time_tracking/serializers.py
+++ b/backend/time_tracking/serializers.py
@@ -1,12 +1,15 @@
 from rest_framework import serializers
-from django.conf import settings
+from django.contrib.auth import get_user_model
 
 from .models import TimeEntry
 
 
+User = get_user_model()
+
+
 class UserSerializer(serializers.ModelSerializer):
     class Meta:
-        model = settings.AUTH_USER_MODEL
+        model = User
         fields = ['id', 'username', 'first_name', 'last_name']
 
 
@@ -47,7 +50,7 @@ class TimeEntrySerializer(serializers.ModelSerializer):
 class TimeEntryCreateSerializer(serializers.ModelSerializer):
     user_id = serializers.PrimaryKeyRelatedField(
         source='user',
-        queryset=settings.AUTH_USER_MODEL.objects.all(),
+        queryset=User.objects.all(),
         write_only=True,
         required=False,
     )