Upgrading istio on gke

I wanted to try deploying WASM extension on gke using this demo application

Realized that GKE doesn’t support istio 1.5.x yet https://cloud.google.com/istio/docs/istio-on-gke/versions

So I just tried
$> istioctl upgrade --force
and got ‘installation complete’ message as in here


then restarted the pods as suggested

To verify update, I ran $> istioctl version and got this
client version: 1.5.2
citadel version: 1.4.6-gke.0
galley version: 1.4.6-gke.0
ingressgateway version: 1.4.6-gke.0
pilot version: 1.4.6-gke.0
policy version: 1.4.6-gke.0
sidecar-injector version: 1.4.6-gke.0
telemetry version: 1.4.6-gke.0
pilot version: 1.5.2
data plane version: 1.4.6-gke.0 (18 proxies)

It doesn’t look like it’s updated. Is there a way to do this properly?