Every virtual or dedicated hosting server has its own Operating System and functions independently from the servers of other customers. Updating the Operating system is frequently ignored, but doing that may have lots of benefits for your sites. The most important reason to use the newest version is that patches are frequently released to deal with security holes inside the Os code, so if you do not install the updates, you risk people with harmful intentions to use these holes and to access your content. Operating system updates are also released for much better functionality of the system overall and for better compatibility with the hardware available on the market, which can directly influence the functionality of your websites. If the performance and the security of your scripts is the reason to update them, you may also discover that their most recent versions require an updated Os to be able to function properly, consequently keeping the OS up-to-date is always a good idea.