Minor release upgrades are released regularly by all software developers, and PostgreSQL has had its share of corrections. When a minor release occurs, we bump the last number, usually by one. So, the first release of a major release such as 11 is 11.0. The first set of bug fixes is 11.1, then 11.2, and so on.
The PostgreSQL Community releases new bug fixes quarterly. If you want bug fixes more frequently than that, you will need to subscribe to a PostgreSQL support company. This recipe is about moving from a minor release to a minor release.