django_lostplaces/lostplaces/__init__.py

@@ -5,7 +5,7 @@ from django.conf import settings
 
 settings.THUMBNAIL_ALIASES = {
     '': {
-        'thumbnail': {'size': (300, 200), 'sharpen': True, 'crop': True, 'upscale': True},
+        'thumbnail': {'size': (300, 200), 'sharpen': True, 'crop': True},
         'hero': {'size': (700, 466), 'sharpen': True, 'crop': True},
         'large': {'size': (1920, 1920), 'sharpen': True, 'crop': False},
     },

django_lostplaces/lostplaces/apps.py

@@ -4,5 +4,4 @@
 from django.apps import AppConfig
 
 class LostplacesAppConfig(AppConfig):
-    default_auto_field = 'django.db.models.AutoField'
     name = 'lostplaces'