Every virtual or dedicated server has its own Operating System and works separately from the servers of other clients. Updating the OS is frequently ignored, but doing that may have quite a lot of advantages for your sites. The most significant reason to employ the most recent version is that patches are frequently released to repair 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. OS updates are also released for enhanced performance of the system overall and for better compatibility with the hardware on the market, which could immediately affect the performance of your sites. If the functionality and the security of your scripts is the reason to update them, you could also discover that their newest versions require an updated Os in order to operate effectively, thus keeping the OS up-to-date is always recommended.