Upgrade HASS RPAIO

sudo su -s /bin/bash hass (sudo)
source /srv/hass/hass_venv/bin/activate   (virtual enviroment)
pip3 install --upgrade homeassistant    (update)
exit ( return to user mode)
sudo systemctl restart home-assistant.service (restart HASS)

press ctrl + f5 to hard refresh your front end

ref: https://home-assistant.io/getting-started/installation-raspberry-pi-all-in-one/

sudo su -s /bin/bash homeassistant
source /srv/homeassistant/bin/activate
pip3 install --upgrade homeassistant
exit
sudo systemctl restart home-assistant@homeassistant