In 2018, AWS announced a broad migration of AWS services’ SSL/TLS certificates to our own Certificate Authority, Amazon Trust Services. Consistent with this change, and beginning March 2021, Amazon S3 and Amazon CloudFront will begin migrating the Certificate Authority for each services’ default certificate. Using our own Certificate Authority, AWS services can better manage the security practices used to handle our default certificates.
Your action may be required to ensure your applications continue normal operation after this change. If you already use other AWS services, your application most likely already trusts Amazon Trust Services as many AWS services have already migrated. Visit https://www.amazontrust.com/repository/ for more information about Amazon Trust Services.