laravel 5.1 phpspec command not found

I'm trying to run phpspec but when I do a command phpspec run inside root project folder it just prints:

-bash: phpspec: command not found

But when I do composer show -i it shows it's installed (because it's in package.json):

phpspec/php-diff                      v1.0.2             A comprehensive li...
phpspec/phpspec                       2.5.3              Specification-orie...
phpspec/prophecy                      v1.6.1             Highly opinionated...

What's wrong?

via Chebli Mohamed