Last installation step (hass) on pi failed

Hello,
after running “hass” the first time there are some errors on raspberry pi. Please help!! Tank you

(homeassistant) homeassistant@max2play:/srv/homeassistant $ hass
Traceback (most recent call last):
File “/srv/homeassistant/bin/hass”, line 10, in
sys.exit(main())
File “/srv/homeassistant/lib/python3.7/site-packages/homeassistant/main.py”, line 278, in main
args = get_arguments()
File “/srv/homeassistant/lib/python3.7/site-packages/homeassistant/main.py”, line 60, in get_arguments
import homeassistant.config as config_util
File “/srv/homeassistant/lib/python3.7/site-packages/homeassistant/config.py”, line 52, in
import homeassistant.helpers.config_validation as cv
File “/srv/homeassistant/lib/python3.7/site-packages/homeassistant/helpers/config_validation.py”, line 85, in
from homeassistant.helpers import (
File “/srv/homeassistant/lib/python3.7/site-packages/homeassistant/helpers/script_variables.py”, line 6, in
from . import template
File “/srv/homeassistant/lib/python3.7/site-packages/homeassistant/helpers/template.py”, line 19, in
from jinja2 import contextfilter, contextfunction
ImportError: cannot import name ‘contextfilter’ from ‘jinja2’ (/srv/homeassistant/lib/python3.7/site-packages/jinja2/init.py)

From the docs
20220930_113913

Your Python version is too old.

Ok, thanks. How can I update the version now? Sorry, I am not firm with raspberry and linux …

Then the best way for you is to install the Home Assistant Operating System.