Clarification of documentation detail for upgrading minor version

Hello

I have a 9.6.6 system that misses some features.  It is installed on a
RHEL7 OS.  Reading the 9.6 documentation to upgrade I find the
following:

 "

18.6. Upgrading a PostgreSQL Cluster

This section discusses how to upgrade your database data from one
PostgreSQL release to a newer one.

PostgreSQL major versions are represented by the first two digit
groups of the version number, e.g., 8.4. PostgreSQL minor versions are
represented by the third group of version digits, e.g., 8.4.2 is the
second minor release of 8.4. Minor releases never change the internal
storage format and are always compatible with earlier and later minor
releases of the same major version number, e.g., 8.4.2 is compatible
with 8.4, 8.4.1 and 8.4.6. To update between compatible versions, you
simply replace the executables while the server is down and restart
the server. The data directory remains unchanged — minor upgrades are
that simple."

Can someone please clarify what actions should be taken for this (see
penultimate sentence)?  If I install (yum upgrade for example) then I
believe all updated files will be updated and that does not seem to be
the message in the above.  While I can install to a different area
(and since I will be using the PGDG repo it WILL be different) I could
do this and manually copy the 'bin' directory.  However, I would have
expected to have to copy the 'libs' directory as well and perhaps
others (excluding doc etc.).  I will be moving to a 9.6.16 version so
that seems to comply with the restrictions mentioned in the
documentation (and for the avoidance of good people saying use a later
version and do a major upgrade that is not currently
possible/feasible).

Grateful for any detailed advice on the correct path for the above.
Thanks.
--
Phil Fisher

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