npm install -g @angular/cli@latest
or specific version:
npm install -g @angular/cli@8.3.6
Source: How To Update Angular CLI To Version 8 | Angular 8 CLI Upgrade
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npm install -g @angular/cli@latest
or specific version:
npm install -g @angular/cli@8.3.6
Source: How To Update Angular CLI To Version 8 | Angular 8 CLI Upgrade