Chris Taylor has a point updates to jump in Azure Kubernetes Service:
As it is late at night my brain wasn’t working as it should be but thought I’d put a quick blog out there to say that if you are on v1.11.5 and want to upgrade to >= v1.13.10 then you have to do this in a 2 stage process by upgrading to v1.12.8 first:
Fortunately, upgrading is pretty easy using the Azure command line or even the Azure portal.