Resolving IAM Permission Issues When Upgrading RDS PostgreSQL Version

When upgrading PostgreSQL version for your RDS database instances, you may encounter permission errors if your IAM role doesn't have the necessary permissions. To resolve this, ensure your IAM role has the following permissions: rds:ModifyDBInstance permission for your database instances Access to modify the associated PostgreSQL parameter groups If you encounter permission errors during the upgrade process, contact your AWS administrator to verify that your IAM role includes these permissions. For maximum flexibility, the IAM policy should include wildcards to cover all database instances and PostgreSQL parameter groups in your account/region. This ensures smooth upgrades for future PostgreSQL version updates. Once the correct permissions are in place, you should be able to perform PostgreSQL version upgrades without encountering permission-related errors.