AWS Managed Services (AMS) now supports AWS CloudFormation Stack Update
AWS Managed Services (AMS) launched support for AWS CloudFormation (CFN) Stack Update. You can now make changes to your stack’s configurations or change it’s resources, such as new input parameter values or updated template, through the AMS request for change (RFC) process. Changes submitted are validated for safety and only nondestructive changes are automatically executed. For destructive changes, a change set is provided to you for approval before automated execution.
Source:: Amazon AWS