Ah, to be young and nimble. LineageOS is already steps ahead of many phone manufactures by updating their software packages with the June Android Security update. The company announced on their blog that all builds starting June 6th will include the patch. It means that once you have updated to these new builds, you will have the latest security patches for the platform.
This isn’t the only change in this update to the platform. In the latest build, you have the ability to prevent tasks from being removed when clearing all apps in the recent app view. The System WebView has been updated to Chromium 59, the latest version of that service. Also, you can now disable the lock screen album background when you are playing music.