In order to do this, you must have the testing or unstable repository
enabled and un-commented in /etc/apt/sources/list
For instance, (please not, this will be different based on your
mirrors and sources, but the concept is the same.
as root, nano /etc/apt/sources.list
You'll see lines that look like
deb http://ftp.us.debian.org/debian/ stable main contrib non-free
Comment this out (put a # in front of it) and add
deb http://ftp.us.debian.org/debian/ unstable main contrib non-free
The save the file and exit.
next, do apt-get update
The apt-get install <package name> and it should pull from the
unstable repository.