Update Theia version

Hello, I am currently using Theia v0.8.0 to build my own application, Now I want to update it to the newest version of Theia, like v1.9.0, how can I do it ?

@LamYunfu a Theia-based application is defined by a package.json composed of @theia dependencies. In order to upgrade the version these dependencies must be updated (ex: from 0.8.0 to 1.9.0). If you have a yarn.lock file which pins/locks the dependencies to a specific version, it will need to be updated as well (generally you can use the yarn upgrade command to do so).