Time to Bail · Boarding pass
Act. You can stay.
From June 1, 2027, AKS upgrades clusters left on unsupported versions, outside your maintenance window.[1]
Act means: change a setting or plan before the date. You can stay.
AKS starts upgrading unsupported clusters June 1, 2027
From June 1, 2027, AKS upgrades clusters that still run an unsupported Kubernetes version. It ignores your maintenance window and the deprecated API check. There is no opt-out.
One email with the first steps. Nothing else.
Or add the date to your calendar: Apple or Outlook (.ics) · Google Calendar
Tick steps as you go. Your progress stays in this browser.
Check the Kubernetes version of each cluster against the AKS release calendar.
In the Azure portal, open Diagnose and solve problems, then Kubernetes API deprecations. Fix what it finds.
Upgrade with az aks upgrade before May 31, 2027. Then set the stable auto-upgrade channel.
One email with the first steps. Nothing else.
Or add the date to your calendar: Apple or Outlook (.ics) · Google Calendar
| Platform-initiated upgrades start | June 1, 2027[1] |
|---|---|
| Which clusters | Clusters on an unsupported Kubernetes version after the platform support grace period[1] |
| Upgrade at your own pace until | May 31, 2027[2] |
| What it ignores | Your maintenance window and the deprecated API check; it can override a Pod Disruption Budget that blocks a node drain[1] |
| Expected versions after it | Kubernetes 1.36 or later; clusters enrolled in LTS: 1.33 LTS or later[2] |
| How it moves | One minor version at a time until the cluster reaches a supported version[1] |
| Exact day | Not fixed: during or after the listed month, rate-limited by region, subscription and version[2] |
| Later versions | Each end of life then gets a 60-day grace period before these upgrades[2] |
| Can you opt out? | No[1] |
| Long-term support | Never automatic; you must enable it[1] |
| Clusters on unsupported versions | Upgraded by AKS from June 1, 2027[1] |
AKS upgrades the cluster itself, one minor version at a time. It does not wait for your maintenance window. It does not stop if you still use removed APIs. Workloads may be disrupted.
az aks get-versions --location <region> --output tableaz aks upgrade --resource-group <resource-group> --name <cluster-name> --kubernetes-version <target-version>Source: [1] Supported Kubernetes versions in Azure Kubernetes Service (AKS) (Microsoft) · [2] Platform-initiated upgrades in Azure Kubernetes Service (AKS) (Microsoft)
Check it yourself. Every fact above links here.
Time to bail on AKS clusters on unsupported Kubernetes versions? Act. You can stay. From June 1, 2027, AKS upgrades clusters left on unsupported versions, outside your maintenance window.
On our scale this is Act: change a setting or plan before the date. You can stay.
From June 1, 2027, AKS upgrades clusters that still run an unsupported Kubernetes version. It ignores your maintenance window and the deprecated API check. There is no opt-out.
Here are the facts we checked:
You can stay on Azure Kubernetes Service (AKS). You have to change a setting or plan before the date.
Leaving is a choice here, not a must.
Microsoft is the main source for this page. Azure Kubernetes Service (AKS) has not said more than what is listed here. If a fact is not on this page, we do not know it yet.
Clusters on unsupported versions: Upgraded by AKS from June 1, 2027.
The date to remember is June 1, 2027. Make the change before then.
A few tips:
If the change affects your members or team, send one short email. Say what changes for them and when. Put the most important line first.
If there is a date, send a short reminder a few days before it. Keep a copy of the list you sent it to.
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Arrivals · for builders
People on AKS clusters on unsupported Kubernetes versions can stay if they make the change. Some would rather leave. Get the playbook for this change, and list your product here.
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