helm init --upgrade

To upgrade tiller execute:

helm init --upgrade
helm init --upgrade --force-upgrade

Manually

export TILLER_TAG=v2.0.0-beta.1        # Or whatever version you want
$ kubectl --namespace=kube-system set image deployments/tiller-deploy tiller=ghcr.io/helm/tiller:$TILLER_TAG
deployment "tiller-deploy" image updated

See also

• helm init (deprecated), helm init --upgrade, helm init --canary-image
• Helm, helm [ repo | template | list | install | unsintall | create | show | pull | push | status | history | plugin | search | upgrade | delete | lint | test | package | dependency | get | rollback | version | --help], helm@2, Chart file structure, Helm Charts, values.yaml, chart.yaml, Helm functions, Helm versions, helmfileDeprecated: init , variables, Mapkubeapis

https://v2.helm.sh/docs/install/