Bug Report or Feature Request (mark with an x)

- [ x] bug report -> please search issues before submitting
- [ ] feature request

Command (mark with an x)

- [ ] new
- [ ] build
- [ ] serve
- [ ] test
- [ ] e2e
- [ ] generate
- [ ] add
- [ x] update
- [ ] lint
- [ ] xi18n
- [ ] run
- [ ] config
- [ ] help
- [ ] version
- [ ] doc

Versions

node --version
v10.3.0
npm --version
6.4.1
ng --version
Your global Angular CLI version (6.2.3) is greater thanyour local
version (6.0.0). The local Angular CLI version is used.

To disable this warning use "ng config -g cli.warnings.versionMismatch false".

 _                      _                 ____ _ ___
/ \   _ __   __ _ _   _| | __ _ _ __     / ___| ||_ _|

/ △ \ | '_ \ / | | | | |/ _ | '__| | | | | | |
/ ___ | | | | (| | || | | (| | | | || | | |
// __| ||_, |_,||_,|| _|||
|___/

Angular CLI: 6.0.0
Node: 10.3.0
OS: darwin x64
Angular: 6.0.0
... cli, common, compiler, compiler-cli, core, forms, http
... language-service, platform-browser, platform-browser-dynamic
... router

Package Version

@angular-devkit/architect 0.6.0
@angular-devkit/build-angular 0.6.0
@angular-devkit/build-ng-packagr 0.6.0
@angular-devkit/build-optimizer 0.6.0
@angular-devkit/core 0.6.0
@angular-devkit/schematics 0.6.0
@angular/animations 6.0.1
@angular/cdk 6.0.2
@angular/material 6.0.2
@ngtools/json-schema 1.1.0
@ngtools/webpack 6.0.0
@schematics/angular 0.6.0
@schematics/update 0.6.0
ng-packagr 3.0.0-rc.3
rxjs 6.1.0
typescript 2.7.2
webpack 4.6.0

Repro steps

Existing ng 6 CLI project with three projects (one app and two libraries)
following output from ng update

 ng update
Your global Angular CLI version (6.2.3) is greater than your local
version (6.0.0). The local Angular CLI version is used.

To disable this warning use "ng config -g cli.warnings.versionMismatch false".
    We analyzed your package.json, there are some packages to update:

      Name                               Version                  Command to update
     --------------------------------------------------------------------------------
      @angular/cli                       6.0.0 -> 6.2.3           ng update @angular/cli
      @angular/core                      6.0.0 -> 6.1.8           ng update @angular/core
      @angular/material                  6.0.2 -> 6.4.7           ng update @angular/material
      rxjs                               6.1.0 -> 6.3.2           ng update rxjs


    There might be additional packages that are outdated.
    Or run ng update --all to try to update all at the same time.

$ ng update @angular/cli
Your global Angular CLI version (6.2.3) is greater than your local
version (6.0.0). The local Angular CLI version is used.

To disable this warning use "ng config -g cli.warnings.versionMismatch false".
            Found a modern configuration file. Nothing to be done.

Desired functionality

ng update @angular/cli should update to the version as indicated by the ng update command.