Microsoft released cumulative update KB5089556 (Build 28020.2149) for Windows 11, version 26H1 for insiders on the Canary channel. This update includes a number of improvements and changes aimed at increasing system stability, storage usability, and font rendering quality.
- Improvement of explorer.exe reliability. Improved reliability of explorer.exe when closing the input switcher and when switching between multiple virtual desktops.
- Specify Dev Drive size and volumes in gigabytes. When creating a Dev Drive in the dialog box, you can now specify the size in gigabytes, not just in megabytes. The same applies to resizing volumes in Settings > System > Storage.
- Improvements to Times New Roman font rendering. Improvements have been made to the Times New Roman font family for rendering combined diacritical marks in Greek and Cyrillic alphabets. Issues with character positioning have been fixed – text is rendered more accurately and uniformly, improving readability, eliminating rendering inconsistencies, and enhancing support for users working with Greek and Cyrillic text.
Known issues: PC reset. The PC reset process using the Reset this PC feature may freeze. To complete the reset, select Cloud download (Cloud PBR) instead of local reinstallation. This issue has been fixed.
Installation via Windows Update. Go to Settings > Windows Update and click Check for updates. A computer restart is required to complete the installation.
| Feature / Change | Performance Increase | Performance Decrease | Optimization | PC Speed | Gaming Optimization |
|---|---|---|---|---|---|
| Improvement of explorer.exe reliability | ⚪ None | ⚪ None | 🟢 Medium — fewer crashes when closing input switcher or switching virtual desktops | 🟢 Low — more responsive desktop switching | ⚪ No impact |
| Specify Dev Drive size and volumes in gigabytes | ⚪ None | ⚪ None | 🟡 Low — faster and more precise dev drive creation workflow | ⚪ No impact | ⚪ No impact |
| Improvements to Times New Roman font rendering | ⚪ None | ⚪ None | 🟡 Low — more accurate rendering of Greek and Cyrillic diacritics, reducing visual inconsistencies | ⚪ No impact | ⚪ No impact |
Find and Change Settings
| Setting | Where to find | How to change |
|---|---|---|
| Dev Drive size in gigabytes | Create Dev Drive dialog Settings > System > Storage > Disks & volumes |
When creating a new Dev Drive, type the desired size directly in gigabytes in the size field. To resize an existing volume, navigate to Settings > System > Storage > Disks & volumes, select the volume, click Properties, and enter the new size in gigabytes. |
| Times New Roman font rendering improvements | Automatically applied system-wide | No manual change is required. The updated font rendering for combined diacritical marks in Greek and Cyrillic is applied automatically. To verify, open any application using Times New Roman, such as WordPad or Microsoft Word, and type Greek or Cyrillic text with diacritics. |
Official announcement on the Microsoft website.
The last 10 Windows updates:
| Update | Build | Version | Windows | Channel | Date |
|---|---|---|---|---|---|
| KB5124006 | 28000.3079 | 26H1 | Windows 11 | Preview | 2026-09-11 |
| KB5124115 | 26220.9472 | 25H2 | Windows 11 | Beta | 2026-09-11 |
| KB5124111 | 28020.2991 | 26H1 | Windows 11 | Beta | 2026-09-11 |
| KB5124112 | 28120.3002 | 26H1 | Windows 11 | Experimental | 2026-09-11 |
| KB5124114 | 26340.9482 | 26H2 | Windows 11 | Experimental | 2026-09-11 |
| KB5124010 | 26300.9539 | 26H2 | Windows 11 | Preview | 2026-09-10 |
| KB5125726 | 28120.2912 | 26H1 | Windows 11 | Experimental | 2026-09-08 |
| KB5124058 | 26340.9354 | 26H2 | Windows 11 | Experimental | 2026-09-08 |
| KB5124061 | 26220.9343 | 25H2 | Windows 11 | Beta | 2026-09-08 |
| KB5124059 | 28020.2904 | 26H1 | Windows 11 | Beta | 2026-09-08 |