Amazon RDS for MySQL supports new minor versions 5.7.42 and 8.0.33

Amazon Relational Database Service (Amazon RDS) for MySQL now supports MySQL minor versions 5.7.42 and 8.0.33. We recommend that you upgrade to the latest minor versions to fix known security vulnerabilities in prior versions of MySQL, and to benefit from the bug fixes, performance improvements, and new functionality added by the MySQL community. 

Source:: Amazon AWS