Nokia 7.1 and Nokia 5.3 started receiving September security patch. The update for Nokia 7.1 was released just recently, but the update for Nokia 5.3 has been in circulation for quite some time now, but seems that the release schedule differs between the markets. Our Nokia 5.3 is still waiting for the September security patch while some are receiving it with the new Android Build (V1.280). The update is not so big, just 76.67 MB, and it is bringing UI enhancements, system stability improvements alongside the security patch.
The update for Nokia 7.1 seems to be available also at some markets. The update is 19.23MB large and it is just bringing the latest security patch.