Updates to Spotfire Server are distributed as service packs. A service pack (or a service release) is a release where only the last digit in the version number has been updated (e.g., 11.4.x). By always applying the latest service pack for your Spotfire Server version, you ensure that you get the latest closed issues, third-party component updates, and security updates. In most situations, the service packs are delivered instead of hotfixes.