https://learn.microsoft.com/en-us/windows/release-health/windows-message-center
Reminder: Windows 11, version 21H2 end of servicing (Home & Pro)
On October 10, 2023, Home and Pro editions of Windows 11, version 21H2 will reach end of servicing. The upcoming October 2023 security update, to be released on October 10, 2023, will be the last update available for this version. After this date, devices running this version will no longer receive monthly security and preview updates containing protections from the latest security threats.To help keep you protected and productive, Windows Update will automatically initiate a feature update for Windows 11 consumer devices and non-managed business devices that are at, or within several months of reaching, end of servicing. This keeps your device supported and receiving monthly updates that are critical to security and ecosystem health. For these devices, you will be able to choose a convenient time for your device to restart and complete the update…
IMPORTANT The September 2023 non-security preview update will be the last optional release and the October 2023 security update will be the last security release for Windows 11, version 21H2. Windows 11, version 22H2 will continue to receive security and optional releases.