Ошибка "ModuleNotFoundError: Нет модуля с именем 'psycopg2'" при развертывании приложения Django на Google App Engine

Я работаю над приложением Django и использую Fabric для развертывания.
Когда я развернул приложения на staging в Google App Engine, используя fab testing, я получил эту ошибку:

Updating service [staging] (this may take several minutes)...failed.                                
ERROR: (gcloud.app.deploy) Error Response: [9] An internal error occurred while processing task /app-engine-flex/flex_await_healthy/flex_await_healthy>2022-01-01T09:48:30.226Z15496.fj.0: Traceback (most recent call last):
  File "manage.py", line 10, in <module>
    execute_from_command_line(sys.argv)
  File "/env/lib/python3.6/site-packages/django/core/management/__init__.py", line 371, in execute_from_command_line
    utility.execute()
  File "/env/lib/python3.6/site-packages/django/core/management/__init__.py", line 347, in execute
    django.setup()
  File "/env/lib/python3.6/site-packages/django/__init__.py", line 24, in setup
    apps.populate(settings.INSTALLED_APPS)
  File "/env/lib/python3.6/site-packages/django/apps/registry.py", line 89, in populate
    app_config = AppConfig.create(entry)
  File "/env/lib/python3.6/site-packages/django/apps/config.py", line 116, in create
    mod = import_module(mod_path)
  File "/opt/python3.6/lib/python3.6/importlib/__init__.py", line 126, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
  File "<frozen importlib._bootstrap>", line 994, in _gcd_import
  File "<frozen importlib._bootstrap>", line 971, in _find_and_load
  File "<frozen importlib._bootstrap>", line 955, in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 665, in _load_unlocked
  File "<frozen importlib._bootstrap_external>", line 678, in exec_module
  File "<frozen importlib._bootstrap>", line 219, in _call_with_frames_removed
  File "/env/lib/python3.6/site-packages/django/contrib/postgres/apps.py", line 8, in <module>
    from .signals import register_type_handlers
  File "/env/lib/python3.6/site-packages/django/contrib/postgres/signals.py", line 3, in <module>
    import psycopg2
ModuleNotFoundError: No module named 'psycopg2'

Я уверен, что psycopg2 был успешно установлен ранее. Вот список установленных зависимостей после проверки pip list:

...
platformdirs                      2.4.0
prompt-toolkit                    3.0.24
protobuf                          3.19.1
psutil                            5.5.1
psycopg2                          2.8.6
pyasn1                            0.4.8
pyasn1-modules                    0.2.8
pycairo                           1.16.2
...

Кто-нибудь может помочь? Спасибо!

sudo apt-get install build-dep python-psycopg2

 pip install psycopg2-binary