Jellyfin ships 12.0, a major release that drops the ‘10’ prefix and rewrites playlist and collection storage to speed up large libraries. Back up first, then upgrade from 10.11.x and run a full library scan.

On September 8, Jellyfin released version 12.0, which drops the “10.” prefix and concentrates most of its work on the performance inherited from the 10.11 rewrite. The migration changes the database with no way back: backup, plugin removal, and a full library scan are mandatory before you reap the gains.

On August 13, 2026, the PostgreSQL project released 18.6, 17.11, 16.15, 15.19, 14.24 and 19 Beta 3, fixing 28 security vulnerabilities — a record — including a dozen memory bugs exploitable for code execution. Apply the minor release now, and if you are still on version 14, plan the major upgrade before November 12, 2026.