Grails 4 takes the powerful and flexibility of the Grails framework to a new level, with the latest versions of core frameworks like Spring 5.1, Spring Boot 2.1, Gradle 5, and Groovy 2.5. Additionally, Micronaut is now part of the Grails foundation, allowing many powerful features from Micronaut to be used natively within your Grails apps. In this talk, we’ll look at how you can upgrade your Grails 3 project (with a little aside for Grails 2 projects as well) to Grails 4, and get a taste of the new features at your disposal in this exciting new release.