To keep up with the latest releases you can use the standard bench update method. Make sure to take a backup of all your sites, databases and files before running the bench update command as it is known to break things.
For SSL configuration, you can run the following commands;
Before you begin, add an A record on your domain DNS and point it to the ERPN server IP address.
cd /home/[frappe-user]/frappe-bench/
bench config dns_multitenant on
bench setup add-domain [subdomain.yourdomain.com] --site [site-name]
bench setup nginx
sudo service nginx reload
sudo snap install core
sudo snap refresh core
sudo snap install --classic certbot
sudo ln -s /snap/bin/certbot /usr/bin/certbot
sudo certbot --nginx
On console prompt, select correct site number and trying access your site on https:// from the custom domain you just added.
Thanks,
Shashank