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Public story · 2026-09-08 · high
The .NET 10 release rebuilds how playlists load and requires plugins built for 10.11 to be rebuilt from scratch.
Why now: Jellyfin published the 12.0 release notes on September 8, 2026.
Jellyfin released version 12.0 on .NET 10, the first major version bump since the 10.x line. It removes the /emby/ and /mediabrowser/ API endpoints that let Jellyfin masquerade as Emby-compatible clients. Anything still pointed at those paths breaks on upgrade.
The practical risk sits with anyone running plugins or self-hosted clients. Plugins built for 10.11 need a rebuild against .NET 10 before they'll load again. The release notes also list a full backup as a requirement, not a suggestion, because of schema changes. Usernames have to be case-unique now too.
The new features target large libraries. Playlists and collections now store one row per item instead of loading the whole structure at once. That should stop big playlists from stalling on open. Episodes gained movie-style alternate versions with independent resume tracking. Books and comics gained metadata support for OPF, ComicInfo, and ComicBookInfo. Recommendations move to a pluggable system, with ListenBrainz built in for music.
The upgrade path is narrow. Jellyfin requires servers to be on 10.10.7 or somewhere in the 10.11.x line before jumping to 12.0. Anyone further behind has to step up first. Subtitle settings also move to per-library configuration, changing where those preferences live even for people who don't touch anything else.
The release notes don't say how long the old Emby-compatible endpoints stay documented anywhere. Third-party clients built against them are on their own to find a migration path.
Each link below shares sources, entities, or timing with this story.
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