What did I upgrade today?

[Tim Dijkstra <newsuser@famdijkstra.org>]

Hi,

A program (sylpheed-claws) stopped working today. I've upgraded some 
packages, but I know sylpheed-claws
wasn't one of them. How do I find out which packegs were upgraded, so 
I can investigate which one broke
sylpheed-claws? Is there some dpkg or apt-cache command (I didn't find it)

Thanks Tim