2.7.1 tells me “You have the latest version of WordPress” and doesn’t offer 2.9

I received an email today urging me to upgrade to 2.9, but when I try to upgrade from 2.7.1 I receive a message that says “You have the latest version of WordPress. You do not need to upgrade…” and gives me the option of re-installing 2.7.1.

What are my options?

Steve