diff --git a/daisy/pyproject.toml b/daisy/pyproject.toml
index d2be890..1704703 100644
--- a/daisy/pyproject.toml
+++ b/daisy/pyproject.toml
@@ -20,7 +20,7 @@ flake8 = "^6.0.0"
 mypy = "^1.4.0"
 ipython = "^8.14.0"
 jupyterlab = "^4.0.2"
-notebook = "^7.0.0"
+notebook = "^6.5.4"
 pkgconfig = "^1.5.5"
 
 [build-system]