ICacheClient.WithPrefix() missing

I tried to use this example: http://docs.servicestack.net/caching#cacheclient-with-prefix

container.Register(c => 

However, the WithPrefix(string prefix) is not resolving.

It’s defined here in the ServiceStack.Caching namespace so you either need to add the ServiceStack.Caching namespace or update to the latest version.

I have 4.5.10, is there any newer version?

There’s v4.5.11 on MyGet but you don’t need it for this, are you referencing the using ServiceStack.Caching; namespace?