The Update BureauKB5101681: Cumulative update for Windows 11, version 26H1, July 2026. Preview moves version 26H1 to build 28000.2608
In short
Advances version 26H1 to OS build 28000.2608. Windows may request a restart.
Does it affect you? Applies to: Devices running Windows 11, version 26H1, on x64 or Arm64.
In detail
- Other The preview advances version 26H1 to OS build 28000.2608.
Technical details
Data sheet · Security · Downloads · Components Click to collapse or expand
Data sheet
- Released
- 2026-07-28
- Classification
- Updates
- Type
- Cumulative update
- Restart
- Required
- Replaces
- KB5101649, KB5095091, KB5095051, KB5089570
- Replaced by
- KB5121000
| Version | Build | Channel |
|---|---|---|
| 26H1 | 28000.2608 | General availability |
| 26H1 | 28000.2608 | Release Preview Channel |
Security
No vulnerabilities are listed for this update.
Downloads (Microsoft Update Catalog)
x64
26H1
3.9 GB
Arm64
26H1
3.2 GB
Updated components
12,461 files changed since the previous update for the same versions.
| Top changed components | Files |
|---|---|
| Settings | 158 |
| Graphics and display | 64 |
| Bluetooth | 63 |
| Printing | 59 |
| Networking | 55 |
| Security and sign-in | 45 |
| Audio | 44 |
| Remote Desktop | 44 |
| .NET networking | 40 |
| Hyper-V and virtualization | 36 |
| File Explorer and shell | 35 |
| Windows Update | 30 |
Sources
Updated
Checked automatically: 8 of 8 checks passed · compared with Microsoft's page on Nov 8, 2026
- Quotes found in the official pages: passed
- Numbers found in the sources: passed
- Vulnerabilities from the dossier only: passed
- Links to allowed domains only: passed
- Every official change covered: passed
- Readable plain text: passed
- Changes confirmed by the file list: passed
- Sources agree: passed
A second AI read the text against the sources: correctness 5/5, clarity 5/5, completeness 5/5. How we work
Published by The Update Bureau. Written with AI from Microsoft's own documents, checked by rules and a second AI. How we work · Report a mistake