I update QGis to 3.24.3, with this new version, QGIS update Qt library to 5.15.3.

Now when I run my PyQgis App, I have this error:

Cannot mix incompatible Qt library (5.15.3) with this library (5.15.2)

Any idea to resolve it?

  • Hmm, I have the exact same problem on Linux mint, based off 22.04 Ubuntu. The suggestion below doesn't work for me, It just deletes the bindings you need to run pyqgis
    – U2ros
    Apr 19, 2023 at 10:39

2 Answers 2


I resolve uninstalling this library:

pip uninstall pyqt5-qt5

I encountered the same error under Ubuntu 22.04, QGIS 3.22. In my case, I solved the problem by using pip3 to uninstall a different package:

sudo pip3 uninstall pyqt5

This is based on the bug report here and here.

I didn't find it necessary to reinstall any package using apt as the bug report says. After the pip3 uninstall, I can still successfully do:

from PyQt5.QtCore import *

It seems as if both apt and pip3 installed their own versions of pyqt5, and there is a version conflict.

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