So I realized that even though I'm just getting started, I'm already behind.chuckle. Here you go:
elixir --versionErlang/OTP 18 [erts-7.3] [source] [64-bit] [smp:4:4] [async-threads:10] [hipe] [kernel-poll:false] [dtrace]Elixir 1.2.4
So it is the normal brew process (you type what's in bold):
**brew update** **brew upgrade elixir** elixir --version elixir --versionErlang/OTP 19 [erts-8.0.2] [source] [64-bit] [smp:4:4] [async-threads:10] [hipe] [kernel-poll:false] [dtrace]Elixir 1.3.2