LibreOffice is the power-packed free, libre and open source personal productivity suite for Windows, Macintosh and GNU/Linux, that gives you six feature-rich applications for all your document production and data processing needs: Writer, Calc, Impress, Draw, Math and Base.

The LibreOffice 3.4.5 has been released last January 16, 2012 and LibreOffice 3.4.5 availabe in Linux, Windows, and Mac.
Install/Upgrade LibreOffice 3.4.5 via PPA
To Upgrade LibreOffice 2.4.5 open a terminal:

sudo apt-get update
sudo apt-get upgrade

Install LibreOffice 3.4.5 via PPA
To Install latest LibreOffice open a terminal.

sudo add-apt-repository ppa:libreoffice/ppa
sudo apt-get update
sudo apt-get install LibreOffice

Download LibreOffice 3.4.5
http://www.libreoffice.org/download/