Each and every virtual or dedicated hosting machine has its own Os and works independently from the servers of other customers. Updating the Operating system is frequently neglected, but doing that might have quite a lot of benefits for your sites. The most important reason to use the latest version is that patches are typically released to repair security holes in the Os code, so if you don't install the updates, you risk people with malicious intentions to use these holes and to gain access to your content. Operating system updates are also released for improved performance of the system overall and for far better compatibility with the hardware available on the market, which could immediately affect the performance of your internet sites. If the functionality and the security of your scripts is the reason to update them, you may also discover that their most up-to-date versions require an updated Operating System so as to function properly, thus keeping the Operating system up-to-date is always a wise idea.