<p>According to this: <a href="https://github.com/kubernetes/kops#compatibility-matrix" rel="nofollow noreferrer">https://github.com/kubernetes/kops#compatibility-matrix</a>
the versions should be fine. When I run <code>kubectl get node</code> I get the following output: </p>

<pre><code>Error from server (NotAcceptable): unknown (get nodes)
</code></pre>

<p>kubectl version:</p>

<pre><code>Client Version: version.Info{Major:"1", Minor:"13", GitVersion:"v1.13.0", GitCommit:"ddf47ac13c1a9483ea035a79cd7c10005ff21a6d", GitTreeState:"clean", BuildDate:"2018-12-03T21:04:45Z", GoVersion:"go1.11.2", Compiler:"gc", Platform:"linux/amd64"}
Server Version: version.Info{Major:"1", Minor:"7", GitVersion:"v1.7.16", GitCommit:"e8846c1d7e7e632d4bd5ed46160eff3dc4c993c5", GitTreeState:"clean", BuildDate:"2018-04-04T08:47:13Z", GoVersion:"go1.8.3", Compiler:"gc", Platform:"linux/amd64"}
</code></pre>

<p>kops version: </p>

<pre><code>Version 1.9.2 (git-cb54c6a52)
</code></pre>

<p>This is the info about the nodes I got when running <code>kops update</code>:</p>

<pre><code>NAME                    STATUS  NEEDUPDATE      READY   MIN     MAX     NODES
master-eu-central-1a    Ready   0               1       1       1       1
nodes                   Ready   0               2       2       2       2
</code></pre>

elp
<p>I missunderstood this. It's pretty obvious now: Client: 1.13.0, Server: 1.7.16.
The server must be the clients version (+/-1 is supported, see <a href="https://github.com/kubernetes/kubernetes/issues/65575#issuecomment-401197687" rel="nofollow noreferrer">here</a> for more). So I edited the server version using <code>kops edit cluster</code> and updated it with <code>kops update cluster</code>.</p>
