The Firebase JavaScript SDK implements the client-side libraries used by applications using Firebase services . This SDK is distributed via: CDN. npm package.
Read moreHow do I change Firebase version?
So you can basically run npm i -g firebase-tools to update the version of your firebase-tools installation to the latest version.
Read moreCan I still use Firebase 8?
This guide assumes that you will take advantage of the version 9 compat libraries to facilitate your upgrade. These libraries allow you to continue using version 8 code alongside code refactored for version 9 . This means you can compile and debug your app more easily as you work through the upgrade process.
Read more