On top of landing AMD FSR 4 support, an update was pushed out after for Proton Experimental to fix up a fix other issues running games on Linux / SteamOS.
As a quick reminder on what it is – Proton Experimental is like their testing ground for future stable numbered version Proton updates (like the upcoming Proton 11 that’s still in Beta).
You can install any version of Proton by just searching for “Proton” in your Steam Library.
If you already have them installed, they will just show up as updates in your Steam Downloads.
Check out the GamingOnLinux Guide to all the different Proton versions.
Here’s the changes for the June 24th update:
Pictured – ARC Raiders on Fedora KDE 44
Great to see even more fixes coming in just before the Steam Machine release.
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**📚 Original Source:**
[Proton Experimental updated for ARC Raiders, DIRT 5, Kingdom Come: Deliverance II](https://www.gamingonlinux.com/2026/06/proton-experimental-updated-for-arc-raiders-dirt-5-kingdom-come-deliverance-ii/)
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