HoloLens periodically checks for system updates so you don't have to. When an update is available, it will be automatically downloaded and installed the next time your device is plugged in and connected to the Internet but isn't in use.
To manually check for updates, go to Settings > Update > Check for updates. If the Settings app says your device is up to date, you have all the updates that are currently available.
Article ID: 12643 - Last Review: 7 Apr 2017 - Revision: 21