To make sure that you’re protected by the latest security updates, Google Chrome automatically updates whenever it detects that a new version of the browser is available. The update process happens in the background and doesn’t require any action on your part.
Check for updates
Updates are available if the wrench icon on the browser toolbar shows a little arrow . To apply the update, just follow the steps below.
- Click the wrench icon on the browser toolbar.
- Select Update Google Chrome.
- In the confirmation dialog that appears, click Restart. The browser saves your opened tabs and windows and reopens them automatically when it restarts. If you’d prefer not to restart right away, click Not now. The next time you restart your browser, the update will automatically be applied.[source]