diff --git a/toolbar/hermes_bridge.shelf b/toolbar/hermes_bridge.shelf
index 3de9b51..866afc6 100644
--- a/toolbar/hermes_bridge.shelf
+++ b/toolbar/hermes_bridge.shelf
@@ -30,7 +30,12 @@ Design notes (why this version differs from the old one):
   making that the default.
 """
 
-from PySide6 import QtWidgets, QtCore, QtGui
+try:
+    # Houdini <= 20.5
+    from PySide2 import QtWidgets, QtCore, QtGui
+except ImportError:
+    # Houdini 21.0+
+    from PySide6 import QtWidgets, QtCore, QtGui
 import hou
 import socket
 import json