How to hide the red/pink notification of WPMU update message in dashboard?

As you know, once a WPMU DEV plugin was installed, the following message will show up in dashboard all the time:

Please install the latest version of our free Update Notifications plugin which helps you stay up-to-date with the most stable, secure versions of WPMU DEV themes and plugins. More information »

Is it possible to hide this message? (for our client’s website)

Thank you!