If you have something connected to a network, you must join the Church of Instantaneous and Perpetual Updates. All software will have bugs that can be exploited. You must update as quickly as you can for as long as the device exists. A lot of systems are built to update automatically and you should take advantage of that. Some updates require manual intervention and you can't put that off.
You have to update because people anywhere in the world can reach out to your network connected device and attempt evil. They bad guys are sharing all the latest information about bugs that cause vulnerabilities. They will probably know before you do. All you can do is make sure you update to close as many holes as possible.