diff --git a/nicohack202002/uncloud/uncloud_api/serializers.py b/nicohack202002/uncloud/uncloud_api/serializers.py
index f5a5a92..57532f2 100644
--- a/nicohack202002/uncloud/uncloud_api/serializers.py
+++ b/nicohack202002/uncloud/uncloud_api/serializers.py
@@ -1,10 +1,12 @@
-from django.contrib.auth.models import User, Group
+from django.contrib.auth.models import Group
+from django.contrib.auth import get_user_model
+
 from rest_framework import serializers
 
 
 class UserSerializer(serializers.HyperlinkedModelSerializer):
     class Meta:
-        model = User
+        model = get_user_model()
         fields = ['url', 'username', 'email', 'groups']
 
 
diff --git a/nicohack202002/uncloud/uncloud_auth/apps.py b/nicohack202002/uncloud/uncloud_auth/apps.py
new file mode 100644
index 0000000..c16bd7a
--- /dev/null
+++ b/nicohack202002/uncloud/uncloud_auth/apps.py
@@ -0,0 +1,4 @@
+from django.apps import AppConfig
+
+class AuthConfig(AppConfig):
+    name = 'uncloud_auth'