# Jellyfin v12.0-rc7 — 12.0 RC7 - Product: Jellyfin (https://whatsnew.fyi/product/jellyfin) - Vendor: Jellyfin - Date: 2026-08-31 - Version: v12.0-rc7 - Original notes: https://github.com/jellyfin/jellyfin/releases/tag/v12.0-rc7 - Permalink: https://whatsnew.fyi/product/jellyfin/releases/v12.0-rc7 - Labels: Pre-release What's New is an index, not a publisher: every entry below links to the vendor's own release notes, which are the authoritative source. Entries are labelled where they are hand-curated sample data, pre-releases, or drawn from a secondary source such as a developer blog. Reuse: the summaries, labels and curation here are © What's New. Quote freely with attribution and a link back; wholesale republication of the corpus is not permitted — terms: https://whatsnew.fyi/terms. The vendors' own release notes remain their publishers'. --- - **fixed** — Fix children count on virtual items - **fixed** — Fix ParentId for episodes in virtual seasons - **added** — Support anime provider ids on season folders - **changed** — Count a season's episodes by the season they belong to - **changed** — Filter search candidates by user access in a single query - **fixed** — Fix formatting and test - **fixed** — Enforce permissions on similar items - **fixed** — Fix item counts on the by-name endpoints - **fixed** — Fix ListenBrainz settings and similar item defaults - **fixed** — Fix recursive handling for LinkedChildren - **changed** — Enforce reliable processing order in PeopleValidationTask - **added** — Add progress logging to data migrations #### :rocket: Jellyfin Server 12.0 RC7 We are pleased to announce the seventh release candidate preview release of Jellyfin 12.0! This is a **preview** release, intended for those interested in testing 12.0 before its final public release. We welcome testers to help find as many bugs as we can before the final release. As always, please ensure you stop your Jellyfin server and take a full backup before upgrading! ##### A note about versioning Starting with this release, we are **dropping the preceding `10.` from our versioning**. Thus, `10.11.x` -> `[10.]12.x` = `12.x`. The reason is simple: at this point in the project, we don't envision a hard break in the API like we planned way back in the early days, and this version scheme was causing a lot of confusion amongst users about what a "major" release was. For more information, please see [the RC1 release notes](https://github.com/jellyfin/jellyfin/releases/tag/v12.0-rc1). ##### What's new? The main goal of this release has been performance. `10.11.0` dropped a **major** backend rewrite, and while it was broadly functional, it had a lot of rough edges. This release seeks to polish out most of those rough edges and bring better performance to all users. There are many other small fixes, improvements, changes, and translations. [See our draft release notes here](https://notes.jellyfin.org/v12.0_release_notes) or below for the full list of pull requests. You can also [view the Web side changelog here](https://github.com/jellyfin/jellyfin-web/releases/tag/v12.0-rc7). **Note:** You **must** be on Jellyfin 10.10.7+ or 10.11.x (ideally, 10.11.11) before upgrading! If you are not, the upgrade will fail. Ensure you upgrade to one of these versions **first**! **Note:** The initial load of Jellyfin 12.x will run a few migrations and will take several minutes. Please be patient and do not interrupt the process. You can leverage the (newly improved!) startup UI on your local network to see specific progress, or off-network to see general progress, by visiting the server URL in your web browser during startup. **Note:** If you install the RC, you should **disable all external plugins** and reinstall using [the unstable plugin repository](https://jellyfin.org/docs/general/server/plugins/#official-jellyfin-plugin-repositories), or plugins may fail to load and cause unintended side effects. ##### Installing This preview release is distributed in all our traditional forms, though not automatically via our Apt repository or `latest` tag. * For all non-Docker environments, you can find the files for manual download in [our repository](https://repo.jellyfin.org/?path=/server) by selecting "Stable Preview" for your OS. * For Docker, you can pull the `12.0-rc7` or `preview` tags. ##### What's Changed (since [`v12.0-rc6`](https://github.com/jellyfin/jellyfin/releases/tag/v12.0-rc6)) * Fix children count on virtual items by @Shadowghost in https://github.com/jellyfin/jellyfin/pull/17718 * Fix ParentId for episodes in virtual seasons by @theguymadmax in https://github.com/jellyfin/jellyfin/pull/17719 * Support anime provider ids on season folders by @Shadowghost in https://github.com/jellyfin/jellyfin/pull/17731 * Count a season's episodes by the season they belong to by @Shadowghost in https://github.com/jellyfin/jellyfin/pull/17735 * Filter search candidates by user access in a single query by @Shadowghost in https://github.com/jellyfin/jellyfin/pull/17739 * Fix formatting and test by @Shadowghost in https://github.com/jellyfin/jellyfin/pull/17744 * Enforce permissions on similar items by @Shadowghost in https://github.com/jellyfin/jellyfin/pull/17729 * Fix item counts on the by-name endpoints by @Shadowghost in https://github.com/jellyfin/jellyfin/pull/17724 * Fix ListenBrainz settings and similar item defaults by @Shadowghost in https://github.com/jellyfin/jellyfin/pull/17748 * Fix recursive handling for LinkedChildren by @Shadowghost in http _[Truncated at 4000 characters — full notes: https://github.com/jellyfin/jellyfin/releases/tag/v12.0-rc7]_