A new version of Qt 5.15 series was released 04.01.2023 and the Qt 5.15 build tutorial has been updated to reflect the new release.
The release is a patch release that does not introduce any new features. It includes bug fixes only, with 14 important bug fixes, many security fixes in qtwebengine and many other bug fixes in other modules.
Sources for included 3rd party components has been updated, PCRE2 to 10.39.
For in-depth details see the release notes.