When deploying CLI generated Angular + Nodejs app, Heroku complains about outdated CLI

I generated an app with Angular-CLI and wrote a very basic Nodejs server for heroku to execute.

Moved my @angular/cli dependency for Heroku to install and build the app with postinstall script like this

"postinstall": "ng build --aot --prod",

however when building the app heroku remote complains

The package "angular-cli" has been renamed to "@angular/cli". The old package will be deprecated soon.
remote:        
remote:        Please take the following steps to avoid issues:
remote:        "npm install --save-dev @angular/cli@latest"

Even though in my package.json I have it listed as

"dependencies": {
  "@angular/cli": "1.0.0-rc.2",
  "@angular/compiler-cli": "^2.4.9",

What gives?

via Nikki Kononov