Security News > 2022 > January > Windows 11 KB5009566 update released with security fixes
Microsoft has released the Windows 11 KB5009566 cumulative update with security updates, performance improvements, and fixes for known bugs.
KB5009566 is a mandatory cumulative update as it contains the January 2022 Patch Tuesday security updates for vulnerabilities discovered in previous months.
Windows 11 users can install today's cumulative update by going to Start > Settings > Windows Update and clicking on 'Check for Updates.
Windows 11 users can also manually download and install the KB5009566 update from the Microsoft Update Catalog.
After installing the KB5009566 update, Windows 11 will change its build number to 22000.
Finally, Microsoft updated the servicing stack to resolve bugs or issues preventing Windows Updates from properly installing future updates.
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