I will confess that my knowledge of how this is done is quite lacking. I relied on Softaculous (supplied by my web host via CPanel to install my TT-RSS. I noticed that I am behind a version or two and just am not quite sure how I go about updating it. Can anyone help me with this? Please and thank you in advance!
You may want to ask the provider of your installation, Softaculous, as this discourse is just about tt-rss.
Start reading the wiki https://git.tt-rss.org/git/tt-rss/wiki and if the wiki seems to spare some needed information, please ask again.
TBH, I’d export your opml, nuke the current install, create a new DB, clone from git, then import opml.