Each new version of the framework comes with Release Notes, which new features, improvements and bug fixes. These usually include migration notes that explain how to migrate to new features / away from deprecated or removed features.
If your app inherits from the Parent POM, then the easiest way to update to the next release is often as simple as changing the
<version> in your application’s parent
<parent> <groupId>org.apache.isis.app</groupId> <artifactId>isis-app-starter-parent</artifactId> <version>2.0.0</version> (1) </parent>
|1||update as required.|
If you want though you can also download the source code and build it directly.