Error deploying django/python app to Heroku - 'Error with requirements to build wheel'

I am trying to deploy my Django app to Heroku. I get the following error output:

Installing build dependencies: started
         Installing build dependencies: finished with status 'done'
         Getting requirements to build wheel: started
         Getting requirements to build wheel: finished with status 'error'
         error: subprocess-exited-with-error
         
         × Getting requirements to build wheel did not run successfully.
         │ exit code: 1
         ╰─> [24 lines of output]
             Traceback (most recent call last):
               File "/app/.heroku/python/lib/python3.13/site-packages/pip/_vendor/pyproject_hooks/_in_process/_in_process.py", line 353, in <module>
                 main()
                 ~~~~^^
               File "/app/.heroku/python/lib/python3.13/site-packages/pip/_vendor/pyproject_hooks/_in_process/_in_process.py", line 335, in main
                 json_out['return_val'] = hook(**hook_input['kwargs'])
                                          ~~~~^^^^^^^^^^^^^^^^^^^^^^^^
               File "/app/.heroku/python/lib/python3.13/site-packages/pip/_vendor/pyproject_hooks/_in_process/_in_process.py", line 118, in get_requires_for_build_wheel
                 return hook(config_settings)
               File "/tmp/pip-build-env-zgoqdfmt/overlay/lib/python3.13/site-packages/setuptools/build_meta.py", line 334, in get_requires_for_build_wheel
                 return self._get_build_requires(config_settings, requirements=[])
                        ~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
               File "/tmp/pip-build-env-zgoqdfmt/overlay/lib/python3.13/site-packages/setuptools/build_meta.py", line 304, in _get_build_requires
                 self.run_setup()
                 ~~~~~~~~~~~~~~^^
               File "/tmp/pip-build-env-zgoqdfmt/overlay/lib/python3.13/site-packages/setuptools/build_meta.py", line 522, in run_setup
                 super().run_setup(setup_script=setup_script)
                 ~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^
               File "/tmp/pip-build-env-zgoqdfmt/overlay/lib/python3.13/site-packages/setuptools/build_meta.py", line 320, in run_setup
                 exec(code, locals())
                 ~~~~^^^^^^^^^^^^^^^^
               File "<string>", line 29, in <module>
               File "<string>", line 26, in get_version
             KeyError: '__version__'
             [end of output]
         
         note: This error originates from a subprocess, and is likely not a problem with pip.
       error: subprocess-exited-with-error
       
       × Getting requirements to build wheel did not run successfully.
       │ exit code: 1
       ╰─> See above for output.
       
       note: This error originates from a subprocess, and is likely not a problem with pip.
 !     Error: Unable to install dependencies using pip.
 !     
 !     See the log output above for more information.
 !     Push rejected, failed to compile Python app.
 !     Push failed

I have tried upgrading Wheel and Setup Tools from a similar Stack Overflow thread but it does not fix the problem. Any ideas what the problem could be?

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