SOLVED: Problem updating Jellyfin container on QNAP

[TheDreadPirate]

The official jellyfin/jellyfin image and the linuxserver/jellyfin image are not interchangeable.

Having said that, linuxserver does have a 10.9.6 image so they aren't running behind. What is probably happening is that docker is being "sticky" and isn't actually checking if you are on the latest linux server image.

Do the following.

Stop your jellyfin container.
Run "sudo docker image prune -a". This will remove the jellyfin image docker is currently using.
Start your jellyfin container. Since we removed the existing image this will force docker to actually check and retrieve the latest jellyfin image.