# Jellyfin v12.0-rc5 — 12.0 RC5

- Product: Jellyfin (https://whatsnew.fyi/product/jellyfin)
- Vendor: Jellyfin
- Date: 2026-08-11
- Version: v12.0-rc5
- Original notes: https://github.com/jellyfin/jellyfin/releases/tag/v12.0-rc5
- Permalink: https://whatsnew.fyi/product/jellyfin/releases/v12.0-rc5
- 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'.

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- **changed** — Degrade ForceKeepAlive logs to debug level
- **changed** — Only treat series and seasons as resumable folders
- **changed** — Keep folder extras with the item that owns the folder
- **fixed** — Fix PCM audio transcoding to wav returning HTTP 500 and headerless output
- **changed** — Improve People deduplication, fix search and restrict ItemByName responses
- **added** — Parse ReplayGain album gain field
- **fixed** — Fix concurrent ffmpeg segment racing
- **changed** — Switch SQLite connection cache to Private
- **changed** — Speed up UpdateOrInsertItems for related information
- **fixed** — Fix captured and discarded Execute exceptions
- **fixed** — Fix disabled plugins being re-enabled on restart
- **changed** — Delete old related info in bulk as late as possible in UpdateOrInsertItems
- **fixed** — Clear metadata provider cache when provider parts are registered
- **fixed** — Fix by-name endpoints reporting TotalRecordCount=0 next to a populated Items array
- **fixed** — Disambiguate progress overlay cache keys
- **changed** — Batch people lookups when building item DTOs
- **fixed** — Stop image endpoints from upscaling beyond the source resolution
- **fixed** — Correct IsAiring negation to exclude airing items
- **fixed** — Bound remote provider pagination

#### :rocket: Jellyfin Server 12.0 RC5

We are pleased to announce the fifth 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-rc5).

**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-rc5` or `preview` tags.

##### What's Changed (since [`v12.0-rc4`](https://github.com/jellyfin/jellyfin/releases/tag/v12.0-rc4))
* Degrade ForceKeepAlive logs to debug by @Shadowghost in https://github.com/jellyfin/jellyfin/pull/17528
* Only treat series and seasons as resumable folders by @Shadowghost in https://github.com/jellyfin/jellyfin/pull/17523
* Update github/codeql-action action to v4.37.6 by @renovate[bot] in https://github.com/jellyfin/jellyfin/pull/17493
* Update dependency SharpCompress to 0.50.4 by @renovate[bot] in https://github.com/jellyfin/jellyfin/pull/17507
* Keep folder extras with the item that owns the folder by @Shadowghost in https://github.com/jellyfin/jellyfin/pull/17524
* Revert "Refresh Live TV channel icons on every guide update." by @theguymadmax in https://github.com/jellyfin/jellyfin/pull/17549
* Fix PCM audio transcoding to wav returning HTTP 500 and headerless output by @vdatanet in https://github.com/jellyfin/jellyfin/pull/17537
* Improve People deduplication, fix search and restrict ItemByName responses by @Shadowghost in https://github.com/jellyfin/jellyfin/pull/17466
* Parse ReplayGain album gain field by @Florin-Popescu in https://github.com/jellyfin/jell

_[Truncated at 4000 characters — full notes: https://github.com/jellyfin/jellyfin/releases/tag/v12.0-rc5]_