Systems Manager now supports on-demand patching with just two clicks
You can now initiate on-demand scanning for patch compliance in accordance with your patch rules, remediate when patches are out of compliance within seconds using AWS Systems Managers Patch Manager, and track the progress in real time. You can patch your instances using pre-defined concurrency and error threshold configurations offered by Patch Manager. This new feature enables you to update your patch compliance on-demand without waiting for the next maintenance window by initiating patching with 2 clicks.
Source:: Amazon AWS