GPLv2 and GPLv3

I believe that under the old GPLv2 license, you always had the option of using GPLv3 anyway:

You aren’t allowed to modify the text of the GPLv2 or GPLv3 license either, it’s copyrighted.

I don’t like the GPL.

That’s probably true, and I never intended it to be GPL2 only, but since I was changing all the headers anyway, I added the “or any later version” phrase just to make things clear.