Hoooraaayy a new version of OSX has made it to your laptop!
Want to start developing now? These are a few things I had to do to get back up and running post upgrade:
1) [must do] Install X Code from the Mac App store. Once its installed, open her up, and in preferences, install the “command line tools" This should fix up git and some minor ruby issues.
2) [most likely need to do] Update RVM by running: rvm get head. This makes sure everything with rvm, your rubies, and rubygems are all in order.
3) [might need] Install a java runtime. Not exactly sure why this popped up, but I definitely was told by my computer that it wanted this. I did it. I am pretty sure it had to do with the Rails asset pipeline.
Dev Env now running at 100%.