Xiaomi is now gracing the Mi A3 with yet another update, in the guise of the September security patch. The OTA is currently rolling out to owners of the global model of the Android One phone and should get to the European variant of the device shortly after.
https://www.notebookcheck.net/The-Mi-A3-starts-receiving-the-September-update-globally-with-bug-fixes-and-improved-security.562114.0.html