is only possible if there are no metadata changes in the versions between.</li>
</ol>

    <h5><a id="upgrade_servers_400_notable" href="#upgrade_servers_400_notable">Notable changes in 4.0.0</a></h5>
    <ul>
        <li>
            Old protocol API versions have been removed. Users should ensure brokers are version 2.1 or higher before upgrading Java clients
	    (including Connect and Kafka Streams which use the clients internally) to 4.0.
            Similarly, users should ensure their Java clients (i