update chrome

Sign into chrome and hit the 3 dots

This will look slightly different on a chromebook but the 3 dots are still there, that is what you want. The steps are the same. 

Hit settings:

bottom left hit about chrome

If an update is needed chrome should begin to update. You may see a button here to run the updates, if so do so. You may also see a button that says relaunch, if you see that hit that as well just be aware it will close out chrome so make sure your work is saved first just in case.