Every virtual or dedicated hosting server has its own Operating System and works separately from the hosting machines of other clients. Updating the Operating system is often overlooked, but doing that may have quite a lot of benefits for your websites. The most important reason to use the latest version is that patches are usually released to fix security holes within the Os code, so if you don't install the updates, you risk people with destructive intentions to take advantage of these holes and to gain access to your content. OS updates are also released for enhanced functionality of the system in general and for better compatibility with the hardware on the market, which could immediately influence the performance of your sites. If the efficiency and the security of your scripts is the reason to update them, you might also know that their most recent versions require an updated Operating System in order to work effectively, consequently keeping the Operating system up-to-date is always a wise idea.