Squeeze-updates not working

[bd satish <bdsatish@gmail.com>]

Hello,

I recently installed Debian 6.0.3, with Linux 2.6.32-5-amd64 kernel.
Few days later there was an announcement of  kernel 2.6.32-39:

http://lists.debian.org/debian-stable-announce/2011/11/msg00001.html

However, I still cannot upgrade to the new kernel in spite of adding
these lines in /etc/apt/sources.list :

 deb http://ftp.debian.org/debian squeeze-updates main
 deb-src http://ftp.debian.org/debian squeeze-updates main


I did apt-get update && apt-get upgrade and nothing happens.
$ uname -a
Linux debian 2.6.32-5-amd64 #1 SMP Thu Nov 3 03:41:26 UTC 2011 x86_64 GNU/Linux

How to upgrade to new kernel ?

-- Satish