Amazon RDS Blue/Green Deployments now supports Aurora and RDS PostgreSQL

Amazon Relational Database Service (Amazon RDS) Blue/Green Deployments now supports safer, simpler, and faster updates to your Amazon Aurora PostgreSQL-Compatible Edition and Amazon RDS for PostgreSQL databases. Blue/Green Deployments create a fully managed staging environment using PostgreSQL community logical replication, that allows you to deploy and test production changes, keeping your current production database safer. With a few clicks, you can promote the staging environment to be the new production system in as fast as a minute, with no data loss and no changes to your application to switch database endpoints. 

Source:: Amazon AWS