To avoid issues with application version mismatches in the same autoscaling group, we can use immutable updates. Immutable updates are performed by adding an additional temporary autoscaling group in the background of the Elastic Beanstalk environment that's connected to the same load balancer. The immutable update creates a new instance and waits for all of its health checks to pass, then loads a subset of traffic alongside the original group to the new instance. It then proceeds to create the same number of instances that exist in the current autoscaling group and waits for the health checks to pass. Once all of the new instances are healthy, the immutable update process moves the instances into the existing autoscaling group and deletes the old instances and the temporary autoscaling group that was created during the update.