How do I upgrade UbuMonkey?

Download the new .deb file from this page, or from the Sourceforge page.
http://launchpad.net/ubumonkey
http://ubumonkey.sourceforge.net

Double click the .deb file. The Ubuntu Software Center will open. Click "Install".
Enter your password if required.

After all that is done, click on Applications>Internet>UbuMonkey Web Browser. Then new version of UbuMonkey should then open. Enjoy!