How to specify Graph Api version number (Say 1.5) in new Graph Client API 2.0.8

I have just shifted from Graph API Version 1.0 To Version 2.0 (2.0.8). I Know Graph Api has release new version 1.5.

I want to specify the graph API Version number say 1.5 which is just release in Graph Client. I am not sure where to specify the version number.  Appreciate your help.

Here is sample code

  Uri servicePointUri = new Uri(Constants.ResourceUrl);
        Uri serviceRoot = new Uri(servicePointUri, Constants.TenantId);
        ActiveDirectoryClient activeDirectoryClient = new ActiveDirectoryClient(serviceRoot,
                async () => await AcquireTokenAsyncForApplication());
            return activeDirectoryClient;