Jellyfin 12.0 Ships on .NET 10, Drops the Legacy Emby API Endpoints and Bundles ListenBrainz Recommendations
Jellyfin tagged v12.0 on 2026-09-08 (GitHub published_at 01:38 UTC), the first major release since 10.x. Playlists and collections now store one row per item so large collections no longer load whole structures, episodes gained movie-style alternate versions with independent resume tracking, and books/comics support reads OPF, ComicInfo and ComicBookInfo metadata with generated posters and page counts. Recommendation sources are now pluggable rather than fixed, with ListenBrainz shipping in-server for music. The breaking list is long: legacy `/emby/` and `/mediabrowser/` endpoints removed, database schema changes requiring a full backup, plugins built for 10.11 must be rebuilt for .NET 10, subtitle settings move to per-library, usernames must be case-unique, and you must be on 10.10.7 or 10.11.x before upgrading.
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