install KDE 3.1.3

[Philippe Merlin <phil-kde.merlin@laposte.net>]

Hello,
I want to upgrade Kde to Kde 3.1.3, i was in Kde 3.1.2, i modify my 
/ec/apt/sources.list in replacing Kde 3.1.2 by Kde 3.1.3 as indicate in this 
line :
deb http://download.kde.org/stable/3.1.3/Debian stable main
I do :
apt-get update
 i have the messages :
Hit http://download.kde.org stable/main Packages
Ign http://download.kde.org stable/main Release

i do :
apt-get upgrade
And no packages of kde 3.1.3 has been installed.
I don't see what is wrong, may i have Help.
Thank you.
Philou75