How to upgrade Angular CLI to the latest version

First time users:

npm install -g @angular/cli

Update/upgrade:

npm install -g @angular/cli@latest

Check:

ng --version

or Angular 14.X +

ng version

See documentation.

The powerful command installs and replaces the last package.

I had a similar problem. I fixed it.

 npm install -g @angular/cli@latest

and

npm install --save-dev @angular/cli@latest

If you have any difficulties managing your global CLI version it is better to use NVM: MAC, Windows.

To update the local CLI in your Angular project follow this steps:

Starting from CLI v6 you can just run ng update in order to get your dependencies updated automatically to a new version.

ng update @angular/cli

With ng update sometimes you might want to add --force flag.

You can also pass --all flag to upgrade all packages at the same time.

ng update --all --force

If you want just to migrate CLI just run this:

ng update @angular/cli --migrateOnly

You can also pass flag --from=from- version from which to migrate from, e.g --from=1.7.4. This flag is only available with a single package being updated, and only on migration only.

After update is done make sure that the version of typescript you got installed supported by your current angular version, otherwise you might need to downgrade the typescript version. Also bear in mind that usually the latest version of angular won't support the latest version of the typescript.

Checkout Angular CLI / Angular / NodeJS / Typescript compatibility versions here

Also checkout this guide Updating your Angular projects and update.angular.io

OLD ANSWER:
All you need to do is to diff with angular-cli-diff and apply the changes in your current project.

Here is the steps:

1. Say you go from 1.4. to 1.5 then you do https://github.com/cexbrayat/angular-cli-diff/compare/1.4.0...1.5.0
2. click on File changed tab
3. Apply the changes to your current project.
4. npm install / yarn
5. Test all npm scripts (more details here: https://stackoverflow.com/a/45431592/415078)

To update Angular CLI to a new version, you must update both the global package and your project's local package.

Global package:

npm uninstall -g @angular/cli
npm cache clean
# if npm version is > 5 then use `npm cache verify` to avoid errors (or to avoid using --force)
npm install -g @angular/cli@latest

Local project package:

rm -rf node_modules dist # use rmdir /S/Q node_modules dist in Windows Command Prompt; use rm -r -fo node_modules,dist in Windows PowerShell
npm install --save-dev @angular/cli@latest
npm install

Source: Github