Qt 5.9.8 is released today. As a patch release Qt 5.9.8 does not add any new functionality, but provides security fixes and other improvements.
Compared to Qt 5.9.7, the new Qt 5.9.8 contains multiple security fixes, updates to some of the 3rd party modules and close to 20 bug fixes. In total there are around 130 changes in Qt 5.9.8 compared to Qt 5.9.7. For details of the most important changes, please check the Change files of Qt 5.9.8.
Qt 5.9.8 can be installed using the maintenance tool of the online installer. For new installations, please download latest online installer from Qt Account portal or from qt.io Download page. Offline packages are available for commercial users in the Qt Account portal and at the qt.io Download page for open-source users.