Question: I'm build Django app, and it's work fine on my machine, but when I run inside docker container it's rest framework keep crashing, but when I comment any connection with rest framework it's work fine.  My machine: Kali Linux 2021.3 docker machine: Raspberry Pi 4 4gb docker container image: python:rc-alpine3.14 python version on my machine: Python 3.9.7 python version on container: Python 3.10.0rc2  error output: Traceback (most recent call last): File "/app/manage.py", line 22, in <module> main() File "/app/manage.py", line 18, in main execute_from_command_line(sys.argv) File "/usr/local/lib/python3.10/site-packages/django/core/management/__init__.py", line 419, in execute_from_command_line utility.execute() File "/usr/local/lib/python3.10/site-packages/django/core/management/__init__.py", line 413, in execute self.fetch_command(subcommand).run_from_argv(self.argv) File "/usr/local/lib/python3.10/site-packages/django/core/management/commands/test.py", line 23, in run_from_argv super().run_from_argv(argv) File "/usr/local/lib/python3.10/site-packages/django/core/management/base.py", line 354, in run_from_argv self.execute(*args, **cmd_options) File "/usr/local/lib/python3.10/site-packages/django/core/management/base.py", line 398, in execute output = self.handle(*args, **options) File "/usr/local/lib/python3.10/site-packages/django/core/management/commands/test.py", line 55, in handle failures = test_runner.run_tests(test_labels) File "/usr/local/lib/python3.10/site-packages/django/test/runner.py", line 728, in run_tests self.run_checks(databases) File "/usr/local/lib/python3.10/site-packages/django/test/runner.py", line 665, in run_checks call_command('check', verbosity=self.verbosity, databases=databases) File "/usr/local/lib/python3.10/site-packages/django/core/management/__init__.py", line 181, in call_command return command.execute(*args, **defaults) File "/usr/local/lib/python3.10/site-packages/django/core/management/base.py", line 398, in execute output = self.handle(*args, **options) File "/usr/local/lib/python3.10/site-packages/django/core/management/commands/check.py", line 63, in handle self.check( File "/usr/local/lib/python3.10/site-packages/django/core/management/base.py", line 419, in check all_issues = checks.run_checks( File "/usr/local/lib/python3.10/site-packages/django/core/checks/registry.py", line 76, in run_checks new_errors = check(app_configs=app_configs, databases=databases) File "/usr/local/lib/python3.10/site-packages/django/core/checks/urls.py", line 13, in check_url_config return check_resolver(resolver) File "/usr/local/lib/python3.10/site-packages/django/core/checks/urls.py", line 23, in check_resolver return check_method() File "/usr/local/lib/python3.10/site-packages/django/urls/resolvers.py", line 412, in check for pattern in self.url_patterns: File "/usr/local/lib/python3.10/site-packages/django/utils/functional.py", line 48, in __get__ res = instance.__dict__[self.name] = self.func(instance) File "/usr/local/lib/python3.10/site-packages/django/urls/resolvers.py", line 598, in url_patterns patterns = getattr(self.urlconf_module, "urlpatterns", self.urlconf_module) File "/usr/local/lib/python3.10/site-packages/django/utils/functional.py", line 48, in __get__ res = instance.__dict__[self.name] = self.func(instance) File "/usr/local/lib/python3.10/site-packages/django/urls/resolvers.py", line 591, in urlconf_module return import_module(self.urlconf_name) File "/usr/local/lib/python3.10/importlib/__init__.py", line 126, in import_module return _bootstrap._gcd_import(name[level:], package, level) File "<frozen importlib._bootstrap>", line 1050, in _gcd_import File "<frozen importlib._bootstrap>", line 1027, in _find_and_load File "<frozen importlib._bootstrap>", line 1006, in _find_and_load_unlocked File "<frozen importlib._bootstrap>", line 688, in _load_unlocked File "<frozen importlib._bootstrap_external>", line 883, in exec_module File "<frozen importlib._bootstrap>", line 241, in _call_with_frames_removed File "/app/project/urls.py", line 24, in <module> path("", include("apps.urls", namespace="apps")), File "/usr/local/lib/python3.10/site-packages/django/urls/conf.py", line 34, in include urlconf_module = import_module(urlconf_module) File "/usr/local/lib/python3.10/importlib/__init__.py", line 126, in import_module return _bootstrap._gcd_import(name[level:], package, level) File "<frozen importlib._bootstrap>", line 1050, in _gcd_import File "<frozen importlib._bootstrap>", line 1027, in _find_and_load File "<frozen importlib._bootstrap>", line 1006, in _find_and_load_unlocked File "<frozen importlib._bootstrap>", line 688, in _load_unlocked File "<frozen importlib._bootstrap_external>", line 883, in exec_module File "<frozen importlib._bootstrap>", line 241, in _call_with_frames_removed File "/app/apps/urls.py", line 3, in <module> from . import api File "/app/apps/api.py", line 1, in <module> from .serializers import * File "/app/apps/serializers.py", line 1, in <module> from rest_framework import serializers File "/usr/local/lib/python3.10/site-packages/rest_framework/serializers.py", line 27, in <module> from rest_framework.compat import postgres_fields File "/usr/local/lib/python3.10/site-packages/rest_framework/compat.py", line 59, in <module> import requests File "/usr/local/lib/python3.10/site-packages/requests/__init__.py", line 63, in <module> from . import utils File "/usr/local/lib/python3.10/site-packages/requests/utils.py", line 27, in <module> from .cookies import RequestsCookieJar, cookiejar_from_dict File "/usr/local/lib/python3.10/site-packages/requests/cookies.py", line 172, in <module> class RequestsCookieJar(cookielib.CookieJar, collections.MutableMapping): AttributeError: module 'collections' has no attribute 'MutableMapping'  Dockerfile FROM python:rc-alpine3.14 COPY . /app WORKDIR /app ENV UWSGI_PROFILE=core ENV PYTHONUNBUFFERED=TRUE RUN apk add --update --no-cache g++ gcc libxslt-dev # add some nessery libs RUN apk add python3-dev build-base linux-headers pcre-dev RUN pip3 install -U pip # upgrade pip RUN apk update \ && apk add --virtual build-deps gcc python3-dev musl-dev \ && apk add jpeg-dev zlib-dev libjpeg \ && pip install Pillow \ && apk del build-deps RUN apk add --no-cache --virtual=build-dependencies wget ca-certificates && \ wget "https://bootstrap.pypa.io/get-pip.py" -O /dev/stdout | python RUN pip install uwsgi RUN pip3 install -r requirements.txt # install all requirements RUN python uploadstatics.py EXPOSE 80 CMD ["gunicorn","project.wsgi:application", "-b 0.0.0.0:8060"]  NOTES:  I use gunicorn to run the app (the error show even I run't from manage.py) 

Answer: You can downgrade your Python version. That should solve your problem; if not, use collections.abc.Mapping instead of the deprecated collections.Mapping. Refer here: Link