Error while trying to upgrade - failed calling webhook

Error: UPGRADE FAILED: create: failed to create: Internal error occurred: failed calling webhook “rancher.cattle.io”: Post “https://rancher-webhook.cattle-system.svc:443/v1/webhook/mutation?timeout=10s”: x509: certificate has expired or is not yet valid

From 2.6.2 to 2.6.3. Any suggestions?