Update Mercurial installation on Mac OS X

How do I update my Mercurial installation from within Mercurial?

Or, if that's not possible, can I just download the newest installatio开发者_JAVA技巧n package and overwrite the existing older version?

I don't think it's possible to update Mercurial from within itself.

To update Mercurial I just download newest installation package and reinstall from it. Make sure you download one for your version of OS X (due to different python versions in different Mac OS X versions).