Amazon RDS for MariaDB now supports MariaDB major version 10.11, the latest long-term maintenance release from the MariaDB community. Amazon RDS for MariaDB 10.11 includes performance improvements that enable up to 40% higher transaction throughput than prior versions. You can deploy RDS for MariaDB 10.11 on RDS Optimized Read and Optimized Write enabled instance classes for additional performance gains. MariaDB 10.11 major version also includes improvements to authentication, information schema, system versioning, and the InnoDB storage engine made by the MariaDB community.
Source:: Amazon AWS