Microsoft will rotate Windows Update certificates in 2027, with current certificates expiring on May 17, 2027, and June 19, 2027. Devices not updated with replacement certificates will lose access to Windows updates. All actively supported versions of Windows 11 will receive the new certificates, with versions 26H2 and 25H2 already covered by updates released in July 2026. Users of Windows 11 version 24H2 have one week left to upgrade to maintain access to updates.