ng update gives error when dependency is local only

Versions

Angular CLI: 6.0.0-rc.10
Node: 8.11.1
OS: linux x64
Angular: 6.0.0-rc.6
... animations, common, compiler, compiler-cli, core, forms
... http, language-service, platform-browser
... platform-browser-dynamic, router

Package                      Version
------------------------------------------------------
@angular-devkit/architect    0.5.13
@angular-devkit/core         0.5.13
@angular-devkit/schematics   0.5.13
@angular/cdk                 6.0.0-rc.14
@angular/cli                 6.0.0-rc.10
@angular/material            6.0.0-rc.14
@schematics/angular          0.5.13
@schematics/update           0.5.13
rxjs                         6.0.0
typescript                   2.8.3

Repro steps

• have Angular 5.x project with local-only dependencies, i.e. dependency added into package.json but does not exist in the npmjs.org repository .
• run ng update @angular/cli in order to convert .angular-cli.json into proper .angular.json

Observed behavior

> ng update @angular/cli --migrate-only --from=1.7.4
Registry returned 404 for GET on https://registry.npmjs.org/some-private-package

Desired behavior

I expect that ng update will just convert my .angular-cli.json into proper .angular.json without digging into my dependencies.

Mention any other details that might be useful (optional)

[james-tonicanalytics]

I am also experiencing this issue.

The temporary solution that stopped the error occurring was to delete the local dependency from the package.json file and then run ng update @angular/cli. Once the .angular-cli.json was migrated to angular.json, I added the local dependency back in.

[thorsten]

Same issue here.