Amazon Relational Database Service (Amazon RDS) for MariaDB now supports MariaDB minor versions 10.11.5, 10.6.15, 10.5.22 and 10.4.31. We recommend that you upgrade to the latest minor versions to fix known security vulnerabilities in prior versions of MariaDB, and to benefit from the bug fixes, performance improvements, and new functionality added by the MariaDB community.
Source:: Amazon AWS