# v1.0 to v1.1

Follow the [Regular Upgrading Process](./README.md).

## Upgrading Notable Changes

The validation process for `Cluster` objects now has been moved from `karmada-webhook` to `karmada-aggregated-apiserver` 
by [PR 1152](https://github.com/karmada-io/karmada/pull/1152), you have to remove the `Cluster` webhook configuration 
from `ValidatingWebhookConfiguration`, such as:
```diff
diff --git a/artifacts/deploy/webhook-configuration.yaml b/artifacts/deploy/webhook-configuration.yaml
index 0a89ad36..f7a9f512 100644
--- a/artifacts/deploy/webhook-configuration.yaml
+++ b/artifacts/deploy/webhook-configuration.yaml
@@ -69,20 +69,6 @@ metadata:
   labels:
     app: validating-config
 webhooks:
-  - name: cluster.karmada.io
-    rules:
-      - operations: ["CREATE", "UPDATE"]
-        apiGroups: ["cluster.karmada.io"]
-        apiVersions: ["*"]
-        resources: ["clusters"]
-        scope: "Cluster"
-    clientConfig:
-      url: https://karmada-webhook.karmada-system.svc:443/validate-cluster
-      caBundle: {{caBundle}}
-    failurePolicy: Fail
-    sideEffects: None
-    admissionReviewVersions: ["v1"]
-    timeoutSeconds: 3
   - name: propagationpolicy.karmada.io
     rules:
       - operations: ["CREATE", "UPDATE"]
```

Otherwise, when joining clusters(or updating Cluster objects) the request will be rejected with following errors:
```
Error: failed to create cluster(host) object. error: Internal error occurred: failed calling webhook "cluster.karmada.io": the server could not find the requested resource
```

Please refer to [v1.1.0 Release Notes](https://github.com/karmada-io/karmada/releases/tag/v1.1.0) for more details.