ModuleNotFoundError: No module named 'werkzeug.contrib' on session_redis install

[anamariakEP]

Hi. I tried to install the redis python package and only the session_redis(v14) module on odoo 14 enterprise version, but I get the following error:

File "/usr/lib/python3/dist-packages/odoo/modules/registry.py", line 89, in new
  odoo.modules.load_modules(registry._db, force_demo, status, update_module)
File "/usr/lib/python3/dist-packages/odoo/modules/loading.py", line 459, in load_modules
  processed_modules += load_marked_modules(cr, graph,
File "/usr/lib/python3/dist-packages/odoo/modules/loading.py", line 347, in load_marked_modules
  loaded, processed = load_module_graph(
File "/usr/lib/python3/dist-packages/odoo/modules/loading.py", line 179, in load_module_graph
  load_openerp_module(package.name)
File "/usr/lib/python3/dist-packages/odoo/modules/module.py", line 385, in load_openerp_module
  __import__('odoo.addons.' + module_name)
File "/mnt/extra-addons/external_addons/session_redis/__init__.py", line 2, in <module>
  from . import http
File "/mnt/extra-addons/external_addons/session_redis/http.py", line 13, in <module>
  from .session import RedisSessionStore
File "/mnt/extra-addons/external_addons/session_redis/session.py", line 7, in <module>
  from werkzeug.contrib.sessions import SessionStore

ModuleNotFoundError: No module named 'werkzeug.contrib'

I have Werkzeug==0.16.1 installed.
Do you have any suggestion why this might happen?
Thank you kindly in advance!