Chrome OS is being extensively updated every six weeks, with security fixes occurring more frequently. Updates are usually downloaded and installed automatically in the background. But to make sure your Chromebook always runs the latest available build.
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First things first: You receive a notification when an update is downloaded and installed because you must restart your computer to complete the update process.
Click the clock at the bottom right to open the taskbar and notification panel. If an update is available, a notification will be displayed at the top of the menu. Click "Restart to Refresh".
Make sure you've saved any changes before clicking to restart your Chromebook. Unsaved data may be lost when your Chromebook is restarted.
If this notification does not appear, click the adjustment gear.
Then click on the Hamburger menu and then on the menu "About Chrome OS".
Click "Check for Updates". When your Chromebook finds an update, it automatically downloads.
 After downloading the update, you must restart the device to complete the process. Click on "Restart".
. If you prefer to wait until your Chromebook restarts and your work is complete, just close the menu and your Chromebook installs the update the next time you reboot.
To check if your Chromebook is up to date after the reboot, return to the About Chrome OS page, or enter
chrome: // settings /. Help in the Chrome browser Omnibox. Now that you've got the latest update, you should see "Your Chromebook is up to date."