Chapter 3: Sitemap - Exception Value: 'set' object has no attribute 'values'

[KwilliamAB]

Hi, has anyone experienced this issue and found a fix? "Exception Value: 'set' object has no attribute 'values'".
Any help would be great. Thanks in advance

Error
Request Method: GET
Request URL: http://127.0.0.1:8000/sitemap.xml

Django Version: 4.1.2
Python Version: 3.11.1
Installed Applications:
['django.contrib.admin',
'django.contrib.auth',
'django.contrib.contenttypes',
'django.contrib.sessions',
'django.contrib.messages',
'django.contrib.staticfiles',
'blog.apps.BlogConfig',
'taggit',
'django.contrib.sites',
'django.contrib.sitemaps']

Traceback (most recent call last):
File "C:\Python\venvs\311_all\Lib\site-packages\django\core\handlers\exception.py", line 55, in inner
response = get_response(request)
File "C:\Python\venvs\311_all\Lib\site-packages\django\core\handlers\base.py", line 197, in _get_response
response = wrapped_callback(request, *callback_args, **callback_kwargs)
File "C:\Python\venvs\311_all\Lib\site-packages\django\contrib\sitemaps\views.py", line 34, in inner
response = func(request, *args, **kwargs)
File "C:\Python\venvs\311_all\Lib\site-packages\django\contrib\sitemaps\views.py", line 120, in sitemap
maps = sitemaps.values()

Exception Type: AttributeError at /sitemap.xml
Exception Value: 'set' object has no attribute 'values'

sitemaps.py:
from django.contrib.sitemaps import Sitemap
from .models import Post

class PostSitemap(Sitemap):
changefreq = 'weekly'
priority = 0.9

def items(self):
    return Post.published.all()

def lastmod(self, obj):
    return obj.updated_at

urls.py (main):
from django.contrib import admin
from django.urls import path, include
from django.contrib.sitemaps.views import sitemap
from blog.sitemaps import PostSitemap

sitemaps = {
'posts', PostSitemap,
}

urlpatterns = [
path('admin/', admin.site.urls),
path('blog/', include('blog.urls', namespace='blog')),
path('sitemap.xml', sitemap, {'sitemaps': sitemaps},
name='django.contrib.sitemaps.views.sitemap')
]