The June 2021 Windows 10 Security update (KB5003637), July 2021 Windows 10 Security update (KB5004237) and the July 2021 OOB update (KB5004945) include a pre-requisite for the Servicing Stack Update which is included in the May 2021 Windows 10 Security Update (KB5003173). If you use Microsoft Endpoint Configuration Manager with Windows Server Update Services (WSUS) to manage and deploy your monthly cumulative updates, you must install the May 11, 2021 update (KB5003173) before you can install the latest cumulative update.
Because the June 2021(KB5003637), July 2021(KB5004237) and July OOB(KB5004945) security updates supersede the May 2021 security update, it is possible that the May 2021 security update is no longer deployable in your Configuration Manager environment if you have changed the supersedence rule from the default. This could impact your ability to meet the pre-requisites for these updates.
The August 2021 servicing stack update (SSU) (KB5005260) will satisfy the June 2021, July 2021 and July 2021 OOB security updates pre-requisite for the May 2021 security update.
Note: The August 2021 SSU (KB5005260) is only applicable to devices that have not already installed the May, June, or July 2021 security updates.