Amazon MSK now supports Apache Kafka version upgrades
In a few clicks you can take advantage of new Apache Kafka features and bug fixes by upgrading the version of Apache Kafka deployed on new and existing Amazon Managed Streaming for Apache Kafka (Amazon MSK) clusters. Amazon MSK uses rolling upgrade best practices to maintain high availability and support cluster I/O throughout a version upgrade. See the Amazon MSK version upgrade user guide to learn about version upgrades and how to ensure clients maintain high availability throughout an upgrade.
Source:: Amazon AWS