Hi there,
It could well be, as someone else already said, that it wasn't roll out in your country yet. For anything else, you can always try to trash the DATA under Manage Application.
I factory restored my phone and the Market wouldn't update to latest version, and it should do it automatically. Tried google support, 3 days of mails... couldn't help me. Someone here said trash the data and restart, and it worked. My Market instantly updated to latest version.
Perhaps give it a try.
cheers