</p><h3 id=sidecar-upgrade>Sidecar upgrade</h3><p>After the control plane upgrade, the applications already running Istio will still be using an older sidecar. To upgrade the sidecar,
you will need to re-inject it.</p><p>If you're using automatic sidecar injection, you can upgrade the sidecar
by doing a rolling update for all the pods, so that the new version of the
sidecar will be automatically re-injected. There are some tricks to reload
all pods. E.g. There is a <a href=https://gist.github.com/jmound/ff6