Windows 11 Insider Beta Preview Build 26220.9587

Release date: 2 October 2026

Changes and improvements

We've updated Windows text shaping support for Unicode 17.0, helping Windows correctly display and shape newly encoded characters and scripts. Unicode 17.0 added 4,803 characters, including support for four newly encoded scripts: Beria Erfe, Sidetic, Tai Yo, and Tolong Siki.
These updates help keep Windows text support current as the Unicode Standard evolves and improve support for languages and writing systems used by people around the world.

We're making performance improvements to the Settings home page, which should result in reduced loading times in certain scenarios.

We're adding a new entry point for Cloud Rebuild under Settings > System > Recovery, making it easier to access the feature from Settings.

Updates are based on Windows 11, version 25H2 via an enablement package (Build 26220.9587).
The desktop watermark shown at the lower right corner of the desktop is normal for Windows Insider pre-release builds.
Features and experiences included in these builds might never get released as we try out different concepts and get feedback. Features might change over time, be removed, or replaced and never get released beyond Windows Insiders. Some of these features and experiences could show up in future Windows releases when they're ready.
Some features in active development we preview with Windows Insiders might not be fully localized, and localization will happen over time as features are finalized. As you see issues with localization in your language, report those issues to us via Feedback Hub.
Check out Flight Hub for a complete look at what build is in which Insider channel.