diff --git a/pyproject.toml b/pyproject.toml
index 8e1c994..c594134 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -25,10 +25,11 @@ classifiers = [
 dependencies = [
     "jupyter_server>=2.0.1,<3",
     "jupyterlab~=4.1,<5",
+    "notebook<7",
     "peewee",
     "psutil",
     "pyjwt",
-    "jsonschema",
+    "jsonschema<4.20",
     "rucio-clients>=32.0",
     "traitlets",
 ]
diff --git a/requirements.txt b/requirements.txt
index 5ad5e39..af36fe2 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,6 +1,7 @@
 jupyterlab~=4.1,<4.2
+notebook<7
 peewee
-jsonschema
+jsonschema<4.20
 psutil
 pytest
 pytest-mock