So you need to update your wine version on Debian Squeeze. You can go ahead and compile from sources, or you can follow these simple instructions.

Edit your /etc/apt/sources.list by adding the following:

deb https://main.mepis-deb.org/mepiscr/repo/ mepis85cr main

Mepis is a Linux distro based on the stable branch of Debian, but it comes with more updated binaries (wine included).

Edit your /etc/apt/preferences file (or create it if it doesn’t exist):

Package: *
Pin: release n=squeeze
Pin-Priority: 900
Package: *
Pin: release n=mepis85cr
Pin-Priority: 200

This will allow you to choose from which repository to install new packages. By default the squeeze packages will be used.

Now from a console type:

:~$ sudo apt-get update
:~$ sudo apt-get install wine/mepis85cr

The /mepis85cr next to apt-get install will choose the packages from Mepis instead of Debian.

Enjoy your updated wine version!