Upgrade a running WebLogic Kubernetes Operator by using the helm upgrade command. The following instructions are applicable for upgrading operator to version 4.2.9.

helm repo add weblogic-operator https://oracle.github.io/weblogic-kubernetes-operator/charts
      --force-update
helm upgrade \
  --reuse-values \
  --set version=4.2.9 \
  --namespace opns \
  --wait \
  weblogic-kubernetes-operator \
  charts/weblogic-operator