A new 4.11-11 release of Proton has arrived from Valve. These are the changes:

• Fix stuttering mouse cursor issue during longer play sessions.
• Update DXVK to v1.5, which now includes D9VK.
• GTA5's latest update is now playable.
• Restore support for mapped mouse cursor buttons.

And, since we forgot to announce the previous 4.11-10 release a week ago, here are the changes from that one:

• Halo: The Master Chief Collection is now playable! Users on older distributions (with gnutls earlier than 3.5.4) will require the Steam Beta client for now. Some game modes are disabled due to missing EasyAntiCheat support.
• Major improvements to mouse handling. In our testing, this improved Fallout 4, Furi, and Metal Gear Solid V mouse behavior.
• Added new integer scaling mode, to give sharp pixels when upscaling. This can be enabled with this environment variable: WINE_FULLSCREEN_INTEGER_SCALING=1.
• Fix a couple of controller mapping issues. This is known to improve Telltale games with Xbox controllers and Cuphead and ICEY when using PlayStation 4 controllers over Bluetooth.
• Improve gamepad force feedback handling, especially for steering wheel controllers.
• Fix Metal Gear Solid V hang on launch.
• Fix Xbox controller performance regression.
• Trine 4 framerate should no longer be locked to 30 FPS.
• Fix frequent crash in IL-2 Sturmovik.
• D9VK updated to 0.40-rc-p
• FAudio updated to 19.12.
• Miscellaneous DXVK bugfixes.

Full Proton Changelog