AngularJS entered 3 years' maintenance mode. Post the maintenance mode, your AngularJS application will be exposed to potential security threats and would have no safeguard from zero day vulnerabilities. Neither Google nor the AngularJS community has releases an upgrade documentation and chances are they will never. The community and Google's attention has moved elsewhere and you should too. It is high time you should make a strategic migration to a newer, supported technology such as ReactJS. Let's see what ReactJS brings to JavaScriptt table & how it's better than AngularJS. Hire ReactJS developers to build Interactive highly engaging Web Apps.