<p>I found the following description about <code>supported docker versions</code> in kubernetes v1.18 and 1.19 documents.</p>
<p><a href="https://kubernetes.io/docs/setup/production-environment/container-runtimes/" rel="nofollow noreferrer">Container runtimes</a></p>
<pre><code>The Kubernetes release notes list which versions of Docker are compatible with that version of Kubernetes.  
</code></pre>
<p>But I cannot find <code>supported docker versions</code> in the Relase Notes.<br />
<a href="https://v1-18.docs.kubernetes.io/docs/setup/release/notes/" rel="nofollow noreferrer">v1.18 Release Notes</a><br />
<a href="https://kubernetes.io/docs/setup/release/notes/" rel="nofollow noreferrer">v1.19 Release Notes</a></p>
<p>Also, I check the other k8s documents.
v1.15 and v1.16 document describe <code>supported docker versions</code>.<br />
The documents specifically list them.<br />
<a href="https://v1-15.docs.kubernetes.io/docs/setup/release/notes/" rel="nofollow noreferrer">v1.15 Release Notes</a><br />
<a href="https://v1-16.docs.kubernetes.io/docs/setup/release/notes/" rel="nofollow noreferrer">v1.16 Release Notes</a></p>
<pre><code>The list of validated docker versions remains unchanged.
The current list is 1.13.1, 17.03, 17.06, 17.09, 18.06, 18.09. (#72823, #72831)
</code></pre>

geroge k
<p>In fact, there is no information about docker version for 1.18 and 1.19 kubernetes version.</p>
<p>You can suggest documentation upgrade using this <a href="https://github.com/kubernetes/website/issues/new?title=Improvement%20for%20k8s.io/docs/setup/production-environment/container-runtimes/" rel="nofollow noreferrer">link</a> for kubernetes team to include theses information.</p>
