Windows is designed to update automatically, sometimes you may need to manually install an update, follow this guide to do so.


Open your start menu and click on the Settings "gear icon"
In Windows Settings click on "Update & Security" 
On the left pane ensure that you are in the "Windows Update" tab, if not click on "Windows Update".
Click on "Check for updates".
Windows will download and install new updates. When the update finishes it may ask you to restart your computer, save and close anything you may have open and press "Restart Now".

Your Windows system should now be up to date.