Back in March marked the release of Qt 5.15.3 as open-source , one year after it was released to commercial customers of The Qt Company. Today a similar Qt 5.15.4 open-source release is now available, one year after its commercial release.

The Qt Company this morning announced Qt 5.15.4 LTS as open-source following the same year-long period of it just being available to paying Qt customers. The code is now freely available via download.qt.io .

The release notes outline the dozens of bug fixes found in Qt 5.15.4.

Qt 5.15.9 LTS meanwhile is the newest 5.15 long-term support release, issued last month, which we'll then see catch up as publicly available open-source code next year. Qt 6.3 meanwhile is the latest upstream open-source Qt6 tool-kit release as of April.