Amazon RDS PostgreSQL Gets Fresh Minor Version Updates
Amazon RDS for PostgreSQL now supports the latest minor versions (18.6, 17.11, 16.15, 15.19, and 14.24), bringing security patches and bug fixes across all supported branches. You can upgrade seamlessly using automatic minor version upgrades, AWS Organizations policies for phased rollouts, or Blue/Green deployments to keep downtime minimal.
source: [aws/whats-new]