diff --git a/pyproject.toml b/pyproject.toml
index 9fbd8758..cef5d0cb 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -21,7 +21,7 @@ dependencies     = ['pandas',
                     'matplotlib',
                     'numpy',
                     'pydicom >= 2',
-                    'PyQt6',
+                    'PyQt6 <= 6.5',
                     'ruamel-yaml > 0.17.2',
                     'tomli >= 1.1.0 ; python_version < "3.11"',
                     'coloredlogs',