Try 6?

.github/workflows/sphinx.yml

@@ -22,6 +22,7 @@ jobs:
           pip install -e .
           pip install -r ./docs/requirements.txt
           pip uninstall -y pyqt5
+          pip install pyqt6
           pip install opencv-python
           pip install opencv-python-headless
           sphinx-build docs ./docs/_build/html/

setup.py

@@ -10,6 +10,6 @@
     author_email="[email protected]",
     url="https://github.com/birdday/atomaton",
     packages=["atomaton"],
-    install_requires=["numpy", "ase", "vtk", "mayavi", "imageio", "PyQt5"],
+    install_requires=["numpy", "ase", "vtk", "mayavi", "imageio", "PyQt6"],
     tests_require=["pytest"],
 )