diff --git a/requirements.txt b/requirements.txt
index da4b87f..8b3fe73 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -6,6 +6,8 @@ jupyterlab
 notebook
 anywidget==0.9.13
 
+watchfiles
+
 # KERNELS
 
 jupyterlite-xeus