CORE is a web-based, cloud software solution and so you are always going to be on the latest version. We do the software updates automatically in the background on a regular basis and announce it to our users via the CORE Community forum. You should follow the Announcements category on CORE Community to be notified via email.
While logging in to CORE, you can click on the Update Log link at the bottom to read the release notes that list the latest features added and improvements made to CORE since the last update. You can also bookmark this link for future reference.