Qt 5.9.7 is released today. As a patch release Qt 5.9.7 does not add any new functionality, but provides important bug fixes and other improvements.
Compared to Qt 5.9.6, the new Qt 5.9.7 contains almost 60 bug fixes. In total there are around 180 changes in Qt 5.9.7 compared to Qt 5.9.6. For details of the most important changes, please check the Change files of Qt 5.9.7.