Every virtual or dedicated server has its own Operating System and works independently from the hosting machines of other customers. Updating the Operating system is usually ignored, but doing that could have lots of advantages for your websites. The most significant reason to employ the latest version is that patches are usually released to fix security holes in the Operating System code, so if you don't install the updates, you risk people with harmful intentions to exploit these holes and to access your content. OS updates are also released for enhanced performance of the system in general and for much better compatibility with the hardware available on the market, which can immediately affect the efficiency of your websites. If the performance and the security of your scripts is the reason to update them, you could also know that their most up-to-date versions require an updated Os to be able to operate effectively, consequently keeping the OS up-to-date is always a good idea.