diff --git a/docs/requirements-doc.txt b/docs/requirements-doc.txt
index f1e1839..b1bda28 100644
--- a/docs/requirements-doc.txt
+++ b/docs/requirements-doc.txt
@@ -3,4 +3,6 @@ Jinja2<3.1
 conflux-web3
 cfx-utils>=1.0.1
 # sphinx-autodoc-typehints
-# sphinx-design
\ No newline at end of file
+# sphinx-design
+jupyter-server>=2.14.1 # not directly required, pinned by Snyk to avoid a vulnerability
+tornado>=6.4.1 # not directly required, pinned by Snyk to avoid a vulnerability
\ No newline at end of file