Spez In Flarum, updating to the latest version can be achieved by simply installing, uninstalling, or initiating a batch update for extensions via the Extension Manager. This process automatically updates Flarum to the latest version. At least, this has been the case in many forums I’ve tested.
Additionally, I believe this will be more noticeable in version 2.0. In the promotional visuals, core updates were shown in the Extension Manager as well. (Currently, when I test it, core updates do not appear when I click Check for updates in 2.0.0.beta1 but auto updated)
Note: When I tested it, it seemed like I could update Flarum through the Extension Manager, just as if I were installing an extension.
I typed "flarum/core:v2.0.0-beta.2," and it updated automatically. For you, this might appear as something like "flarum/core:v1.8.9."