This is not the Glimmer package used by Ember. This is something else entirely https://www.npmjs.com/package/glimmer and it has version 1.1.5.
Ember actually uses glimmer-engine https://www.npmjs.com/package/glimmer-engine which has latest version 0.17.4
To be fair to Glimmer packaged I haven’t found this dependency either. Do you maybe have a link to the source on Github?