diff --git a/ipyantd/widgets.py b/ipyantd/widgets.py
index 7b2363f..1488ef0 100644
--- a/ipyantd/widgets.py
+++ b/ipyantd/widgets.py
@@ -1,6 +1,6 @@
 import ipyreact
 import traitlets
-from traitlets import List, Unicode, observe
+from traitlets import List, Unicode
 
 
 class Button(ipyreact.Widget):