must be installed in the new cluster, usually via operating system

commands. Do not load the schema definitions, e.g., <command>CREATE

EXTENSION pgcrypto</command>, because these will be duplicated from

the old cluster. (Extensions with available updates can be processed

later using <literal>ALTER EXTENSION ... UPDATE</literal>.)

the old cluster. If extension updates are available,

<application>pg_upgrade</application> will report this and create

a script that can be run later to update them.

</para>

</step>