Security News > 2021 > December > Windows 11 KB5008215 update released with application, VPN fixes
Microsoft has released the Windows 11 KB5008215 cumulative update to fix security vulnerabilities and bugs introduced in previous versions.
KB5008215 is a mandatory cumulative update containing security updates, performance improvements, and bug fixes for Windows 11 21H2. You can install this update by going to Start > Settings > Windows Update and clicking on 'Check for Updates.
Windows 11 users can also manually download and install the KB5008215 update from the Microsoft Update Catalog.
After installing the KB5008215 update, Windows 11 will change its build number to 22000.
Strangely, Microsoft is very quiet regarding what is fixed in the Windows 11 KB5008215 update.
The preview update released last month included the following fixes, which are likely in this update.