BUG #15686: pg_dump: server version: 11.2; pg_dump version: 11.2

The following bug has been logged on the website:

Bug reference:      15686
Logged by:          Andrew Davis
Email address:      developerandy@gmail.com
PostgreSQL version: 11.2
Operating system:   RHEL 6.10
Description:

I recently installed PostgreSQL 11.2 (we were formerly using 9.5.3) and ran
our tests. One of our tests performs a `pg_dump` and I receive the following
error:

2019-03-08 16:43:54.417 [ 123 ] [INFO ] Starting database (dir) dump with:
/path/to/postgresql/bin/pg_dump --file /path/to/file database_name
2019-03-08 16:43:54.429 [ 123 ] [ERROR] pg_dump: server version: 11.2;
pg_dump version: 11.2
2019-03-08 16:43:54.429 [ 123 ] [ERROR] pg_dump: aborting because of server
version mismatch

The server and pg_dump versions are the same and I'm not sure how to
proceed. Is there something in the schema generated from Rails that may be
causing this?

Thank you for your time.
Andy