# Steam SteamOS 3.8.15

- Product: Steam (https://whatsnew.fyi/product/steam)
- Vendor: Valve
- Date: 2026-07-15
- Original notes: https://store.steampowered.com/news/app/1675200/view/698770449667981483
- Permalink: https://whatsnew.fyi/product/steam/releases/2026-07-15-steamos-3.8.15
- Labels: Platforms: Desktop

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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- **fixed** — Fixed an issue preventing enabling HDR in Assassin's Creed Black Flag Resynced
- **fixed** — Fixed an issue that would result in degraded performance in some cases when composition was required such as when having FSR enabled
- **security** — Security and stability improvements

SteamOS 3.8.15 has just been released for all users with the following changes:

**General**

- Fixed an issue preventing enabling HDR in Assassin's Creed Black Flag Resynced

- Fixed an issue that would result in degraded performance in some cases when composition was required (such as when having FSR enabled)

- Security and stability improvements