Following the announcement of updates to the PostgreSQL database by the open source community, we have updated Amazon Aurora PostgreSQL-Compatible Edition to support PostgreSQL versions 9.6.22, 10.17, 11.12, and 12.7. These releases contain bug fixes and improvements by the PostgreSQL community. As a reminder, Amazon Aurora PostgreSQL 9.6 will reach end of life on January 31, 2022. Minor version 9.6.22 is limited to upgrades for clusters already running Aurora PostgreSQL 9.6.
Source:: Amazon AWS