Each and every virtual or dedicated hosting server has its own Operating System and operates separately from the hosting machines of other customers. Updating the OS is often neglected, but doing that could have a wide range of benefits for your websites. The most significant reason to use the latest version is that patches are frequently released to deal with security holes inside the Operating System code, so if you don't install the updates, you risk people with malicious intentions to use these holes and to get access to your content. Operating system updates are also released for enhanced functionality of the system overall and for much better compatibility with the hardware on the market, which can immediately affect the efficiency of your sites. If the efficiency and the security of your scripts is the reason to update them, you may also know that their latest versions require an updated Operating System to be able to function effectively, therefore keeping the OS up-to-date is always a wise idea.