--- a/mpl_scatter_density/tests/test_base_image_artist.py   2019-05-28 23:57:39.000000000 +0800
+++ b/mpl_scatter_density/tests/test_base_image_artist.py   2025-08-26 17:03:02.254064992 +0800
@@ -4,7 +4,7 @@
 from matplotlib.backends.backend_agg import FigureCanvasAgg
 
 try:
-    from matplotlib.backends.backend_qt5 import FigureCanvasQT
+    from matplotlib.backends.backend_qt import FigureCanvasQT
 except ImportError:
     QT_INSTALLED = False
 else:
--- a/mpl_scatter_density/tests/test_scatter_density_artist.py  2024-12-03 22:07:35.000000000 +0800
+++ b/mpl_scatter_density/tests/test_scatter_density_artist.py  2025-08-27 13:08:11.252211300 +0800
@@ -250,13 +250,13 @@
     # This test just ensures that the code runs, but doesn't check for now 
     # that the behavior is correct.
 
-    pytest.importorskip('PyQt5')
+    pytest.importorskip('PyQt6')
 
-    from PyQt5.QtWidgets import QMainWindow
+    from PyQt6.QtWidgets import QMainWindow, QApplication
 
     from matplotlib.figure import Figure
-    from matplotlib.backends.backend_qt5 import FigureManagerQT
-    from matplotlib.backends.backend_qt5agg import FigureCanvasQTAgg
+    from matplotlib.backends.backend_qt import FigureManagerQT
+    from matplotlib.backends.backend_qtagg import FigureCanvasQTAgg
 
     fig = Figure()
     canvas = FigureCanvasQTAgg(fig)
@@ -265,7 +265,7 @@
 
     canvas.draw = Mock(side_effect=canvas.draw)
 
-    from matplotlib.backends.backend_qt5 import qApp
+    qApp = QApplication.instance()
 
     window = QMainWindow()
     window.setCentralWidget(canvas)