Microsoft yet again released a new Windows Cumulative test update to Windows 10 Insiders in the Dev Channel.
Microsoft announced: This update does not include anything new and is designed to test our servicing pipeline. This DOES NOT include any fixes.
So do not expect any changes from installing this update. The only thing changed installing this update is the build number. This will become 21364.1000. If you like to install this update anyway, you can download it directly down below.