How do I update the ChromeOS on my Chromebook?

NOTE: This can be done as Guest or any user... but must be done on each Chromebook individually. 

• Choose either Browse as Guest or log in as any user.
• Open Chrome.
• Click on the Chrome menu (the three dots at the top right).
• In the menu that appears, click on "Help."
• In the sub-menu that appears, click on "About ChromeOS."
• The update page should open.
• Click the "Check for Updates" item.
• If your Chromebook reports that Chrome is up to date, then close windows and you are done.
• If an update runs, you should see a Restart or Relaunch link appear when completed.
• Click "Restart" or "Relaunch."