How To Update This Project To Angular 8?

[Reza-Neyestani]

hi
this project created with angular 6, How to update this project to angular 8?
because i have angular 8 and when i "ng serve" this project , i have error ...
error : An unhandled exception occurred: Could not find module "@angular-devkit/build-angular" from "G:\Angular-Project\VideoClub".

[miladj3]

hi u can use 'npm install' in project for install all dependency and packages of project