diff --git a/pyproject.toml b/pyproject.toml
index ef280b77..1b8fca5e 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -38,6 +38,7 @@ dev = [
 ]
 pyqt5 = ["PyQt5>=5.9"]
 pyqt6 = ["PyQt6>=6.7"]
+pyside6 = ["PySide6>=6.7"]
 
 [project.urls]
 "Bug Tracker" = "https://gitlab.psi.ch/bec/bec_widgets/issues"