From Announcing Windows 11 Insider Preview Build 26100 (Canary and Dev Channels):
UPDATE 4/26: We are starting to roll out Cumulative Update Build 26100.268 (KB5036908) to Windows Insiders in the Dev Channel. This update is designed to test our servicing pipeline and is the same as the April 2024 security update released earlier this month for Windows 11, version 23H2.
