You'll need gpg and signing-party installed before running this

Debian/Ubuntu:

apt-get install signing-party

Mac OSX with homebrew:

brew install gpg signing-party
brew install graphviz

First make sure your folder has the correct permission and then run update.sh:

chmod 700 .
./update.sh

You should see an updated version of this:

https://raw.githubusercontent.com/cz8s/thoughtworks-wot/master/thoughtworks-sigs.png

Have fun!