As breaches go this was a very small one with only a few hundred out of millions of passwords being hacked.
However, to be on the safe side, Dropbox have advised people to change their current password with, as always, a stronger password.
So, if you have DropBox installed here is how to change the password.
1. Go to dropbox
2. Enter your user name and password.
3. Once logged in click on your logon name and choose Settings
4. Click on the Security Tab and scroll to the bottom of the page
5. Click on Change Password and type in a good (but memorable) password