<p>I've noticed that Kubernetes 1.22.3-gke.1500 version is available in GKE's Regular channel. My cluster is in version 1.21.6-gke.1500 (master and node pool). I am trying to upgrade to newer version, but I get an error:</p>
<blockquote>
<p>Master version &quot;1.22.3-gke.1500&quot; is unsupported.</p>
</blockquote>
<p>No further explanations or details. Why is the newer version unsupported? How can I fix that?</p>

Jacek
<p>Use <code>gcloud container get-server-config --region {your-region}</code> to see what versions your region supports. For example, I'm in europe-west2</p>
<pre><code>$ gcloud container get-server-config --region europe-west2
Fetching server config for europe-west2
channels:
- channel: RAPID
  defaultVersion: 1.22.3-gke.1500
  validVersions:
  - 1.23.1-gke.500
  - 1.22.4-gke.1501
  - 1.22.3-gke.1500
  - 1.22.3-gke.700
  - 1.21.6-gke.1500
  - 1.21.5-gke.1802
- channel: REGULAR
  defaultVersion: 1.21.6-gke.1500
  validVersions:
  - 1.21.6-gke.1500
  - 1.21.5-gke.1802
  - 1.20.12-gke.1500
  - 1.20.11-gke.1801
- channel: STABLE
  defaultVersion: 1.20.12-gke.1500
  validVersions:
  - 1.21.5-gke.1802
  - 1.20.12-gke.1500
  - 1.20.11-gke.1801
  - 1.20.11-gke.1300
  - 1.19.15-gke.1801
...
</code></pre>
<p>So in this scenario, if your cluster is on RAPID channel, then 1.22.3-gke.1500 is supported. But if it's on REGULAR or STABLE, it will not be.</p>
<p>Additionally, the updates to the available releases may take a few days. Just because a release note might say it's available does not mean its immediately available.</p>
