ng update @angular/cli hangs

Versions

     _                      _                 ____ _     ___
    / \   _ __   __ _ _   _| | __ _ _ __     / ___| |   |_ _|
   / △ \ | '_ \ / _` | | | | |/ _` | '__|   | |   | |    | |
  / ___ \| | | | (_| | |_| | | (_| | |      | |___| |___ | |
 /_/   \_\_| |_|\__, |\__,_|_|\__,_|_|       \____|_____|___|
                |___/


Angular CLI: 6.0.5
Node: 10.1.0
OS: darwin x64
Angular: 4.4.6
... animations, common, compiler, compiler-cli, core, forms
... http, language-service, platform-browser
... platform-browser-dynamic, router

Package                      Version
------------------------------------------------------
@angular-devkit/architect    0.6.5
@angular-devkit/core         0.6.5
@angular-devkit/schematics   0.6.5
@angular/cli                 6.0.5
@schematics/angular          0.6.5
@schematics/update           0.6.5
rxjs                         5.5.5
typescript                   2.3.4

Repro steps

ng serve "The Angular CLI configuration format has been changed, and your existing configuration can be updated automatically by running the following command:

ng update @angular/cli "

ng update @angular/cli hangs

Observed behavior

just hangs!
even I started with sudo

Desired behavior

should run smoothly

Mention any other details that might be useful (optional)

npm install functioned normally, I believe the network is OKAY.

[MonsieurMan]

Hangs forever without any output in my case.

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