opam and brew upgrade

[Amir Chaudhry <amc79@xxxxxxxxx>]

Hi folks,

Just ran brew update and then brew upgrade and got the following error.

    $ brew upgrade
    ==> Upgrading opam
    ==> Downloading https://github.com/OCamlPro/opam/tarball/0.2
    ######################################################################## 
100.0%
    Error: MD5 mismatch
    Expected: 3f08c3ee397c2ccd42e6d15533bdf958
    Actual: 13931989b390821f0d9c822dbf266fcb
    Archive: /Users/Amir/Library/Caches/Homebrew/opam-0.2.tgz
    (To retry an incomplete download, remove the file above.)

Is this due to muppetry on my part or did something get changed somewhere?  I 
installed opam via anil's original instructions and haven't touched it since.

What should I be doing wrt opam?

ac