Valve released Proton 11.0-1b and 10.0-4b on July 28 to ensure compatibility with the new Steamworks SDK 1.65. These updates address a significant networking issue related to data alignment between 32-bit and 64-bit environments and include optimizations for faster Steamworks initialization. The updates are automatically available for users running either the stable 11.x or the older 10.x branches through Steam's compatibility settings. The community has shown a preference for the 11.0-1b release, reflecting the increasing adoption of the newer version among players

Valve Drops Proton 11.0-1b and 10.0-4b with Steamworks SDK 1.65

Valve published Proton 11.0-1b and 10.0-4b on July 28 to add official compatibility for the newly released Steamworks SDK 1.65. Both builds include a networking patch that resolves a persistent 32-bit to 64-bit data alignment issue under WoW64 prefixes. The 10.0-4b drop also folds in a background optimization that trims unnecessary environment variable calls during Steamworks initialization. Linux gamers running either the stable 11.x stack or the older 10.x branch can grab the updates automatically through Steam's compatibility settings.

Valve Drops Proton 11.0-1b and 10.0-4b with Steamworks SDK 1.65 @ Linux Compatible