This tracker lists the latest Windows 11 updates with their KB numbers, build numbers and release dates. Entries are checked against Microsoft’s official Windows 11 update history, and the page is updated when Microsoft releases a new update.
TL;DR: The latest Windows 11 update is a preview release, KB5127936, from October 28, 2026 (builds 26300.9818 and 26200.9818). The latest regular security update is KB5127648 from October 13, 2026. Microsoft also shipped an out-of-band update, KB5134133, on October 26.
Last updated: November 1, 2026.
How Windows update types work
A security update arrives on Patch Tuesday, the second Tuesday of the month, and installs automatically. A preview update comes near the end of the month and is optional. An out-of-band update is an extra release that Microsoft sends outside the normal schedule, usually to fix a specific problem.
Windows 11 versions 24H2, 25H2 and 26H2 share one update, which is why each KB below lists more than one build number.
KB5127936 preview update (October 28, 2026)
- Update type: optional preview.
- Builds: 26300.9818 and 26200.9818.
- What changed: Microsoft’s update history page lists the update but shows no contents in the version we could read. We will add the change list after checking the support article.
- What it means for you: preview updates are optional, and the same changes usually reach everyone in the next Patch Tuesday update.
Source: Windows 11 update history.
KB5134133 out-of-band update (October 26, 2026)
- Update type: out-of-band.
- Builds: 26300.9725, 26200.9725 and 26100.9725.
- What changed: Microsoft’s update history page lists no details for this update in the version we could read.
- What it means for you: this build number sits just above the October 13 update, which suggests it builds on that release.
Source: Windows 11 update history.
KB5127648 October 2026 security update (October 13, 2026)
- Update type: regular Patch Tuesday security update.
- Builds: 26300.9711, 26200.9711 and 26100.9711.
- Reported fixes: IT-Connect reports fixes for a black screen bug on Azure Virtual Desktop and an Always On VPN problem.
- Scale of the patch: IT-Connect reports that Microsoft’s October Patch Tuesday fixes more than 1,400 vulnerabilities, which it calls a record. We have only one outlet for this figure, so treat it as unconfirmed.
- End of updates: the same outlet quotes Microsoft’s notes that Windows 11 version 24H2 Home and Pro has reached end of updates. Enterprise and Education stay supported until October 12, 2027.
- What it means for you: if you run 24H2 Home or Pro, move to a newer version to keep getting updates.
Source: Windows 11 update history.
KB5124010 preview update (September 22, 2026)
- Update type: optional preview.
- Builds: 26300.9550, 26200.9550 and 26100.9550.
- What changed: no details are listed on the history page version we could read.
Source: Windows 11 update history.
KB5129195 out-of-band update (September 14, 2026)
- Update type: out-of-band.
- Builds: 26200.9457 and 26100.9457.
- What changed: no details are listed on the history page version we could read.
Source: Windows 11 update history.
KB5124008 September 2026 security update (September 8, 2026)
- Update type: regular Patch Tuesday security update.
- Builds: 26200.9445 and 26100.9445.
Source: Windows 11 update history.
How to check your Windows version
Press the Windows key plus R, type winver and press Enter. The window shows your version and OS build number, which you can compare with the list above.
For recent Windows feature coverage, see our reports on Windows Search previews and filters and the Windows 11 taskbar drag decision.
Frequently Asked Questions
What is the latest Windows 11 update?
The latest on Microsoft’s update history page is KB5127936, an optional preview update from October 28, 2026.
What is the latest Windows 11 security update?
The latest regular security update is KB5127648, released on October 13, 2026.
Do I have to install preview updates?
No. Preview updates are optional, and their changes normally arrive in the next Patch Tuesday update.
