@kenahoo What version of Docker for Mac are you running? The Docker for Mac versions track the Docker engine versions but Docker for Mac 1.12.1 hasn’t been released yet (it is still in QA). There should be a Docker for Mac 1.12.1 release within the week.
Sorry, it looks like I got confused between brew cask install docker and brew install docker. So here’s what I have installed:
% docker --version
Docker version 1.12.0, build 8eab29e
% brew cask info docker
docker: 1.12.0.11213
https://www.docker.com/products/docker
/usr/local/Caskroom/docker/1.12.0.11213 (68B)
From: https://github.com/caskroom/homebrew-cask/blob/master/Casks/docker.rb
==> Name
Docker for Mac
==> Artifacts
Docker.app (app)
The non-cask install of docker (which I don’t have installed) is at 1.12.1:
% brew info docker
docker: stable 1.12.1 (bottled), HEAD
Pack, ship and run any application as a lightweight container
https://www.docker.com/
Not installed
From: https://github.com/Homebrew/homebrew-core/blob/master/Formula/docker.rb
==> Dependencies
Build: go ✘
==> Options
--with-experimental
Enable experimental features
--without-completions
Disable bash/zsh completions
--HEAD
Install HEAD version