Microsoft have released a small update to Windows 11 for Windows Insiders on the dev and beta channels. Both channels are currently running build 22581 and the update (KB5013283) takes the build to 22581.100.
Microsoft say this is for testing the servicing pipeline and doesn’t contain anything new:
UPDATE 3/25: We are starting to roll out Cumulative Update Build 22581.100 (KB5013283). This update does not include anything new and is designed to test our servicing pipeline for builds in the Dev and Beta Channels.