Update Ionic Framework when porject was created with Virtual Studio?


I created a ionic 2 project with Visual Studio.
How can I update the framework from 2.0.0-beta.10 to the RC Version?

When I use ionic lib update i get this:

This command has been deprecated. All resources are currently available in NPM and we recommend that you use NPM to manage these.
More information is available here: https://github.com/driftyco/ionic-cli/wiki/Migrating-to-NPM-from-bower

Unable to load ionic lib version information
Are you sure you want to replace C:\Users\profd\Dropbox\Entwicklung\VS\evmwi\evmwi\www\lib\ionic with an updated version of Ionic?
(yes/no): y
Invalid version: undefined