I'd like to try out the new Ingress resource available in Kubernetes 1.1 in Google Container Engine (GKE). But when I try to create for example the following resource:

apiVersion: extensions/v1beta1
kind: Ingress
metadata:
  name: test-ingress
spec:
  backend:
    serviceName: testsvc
    servicePort: 80

using:

$ kubectl create -f test-ingress.yaml

I end up with the following error message:

error: could not read an encoded object from test-ingress.yaml: API version "extensions/v1beta1" in "test-ingress.yaml" isn't supported, only supports API versions ["v1"]
error: no objects passed to create

When I run kubectl version it shows:

Client Version: version.Info{Major:"1", Minor:"0", GitVersion:"v1.0.7", GitCommit:"6234d6a0abd3323cd08c52602e4a91e47fc9491c", GitTreeState:"clean"}
Server Version: version.Info{Major:"1", Minor:"1", GitVersion:"v1.1.1", GitCommit:"92635e23dfafb2ddc828c8ac6c03c7a7205a84d8", GitTreeState:"clean"}

But I seem to have the latest kubectl component installed since running gcloud components update kubectl just gives me:

All components are up to date.

So how do I enable the extensions/v1beta1 in Kubernetes/GKE?