diff --git a/MDANSE_GUI/pyproject.toml b/MDANSE_GUI/pyproject.toml
index 0ebe04d597..87a720e4c6 100644
--- a/MDANSE_GUI/pyproject.toml
+++ b/MDANSE_GUI/pyproject.toml
@@ -36,6 +36,7 @@ dependencies = [
     "qtpy",
     "vtk",
     "PyQt6",
+    "pyqt6-tools",
     "PyYAML",
 ]