diff --git a/Solutions/ThreatAnalysis&Response/Notebook/requirements.txt b/Solutions/ThreatAnalysis&Response/Notebook/requirements.txt
index 47eb753eba4..a5ebc429209 100644
--- a/Solutions/ThreatAnalysis&Response/Notebook/requirements.txt
+++ b/Solutions/ThreatAnalysis&Response/Notebook/requirements.txt
@@ -7,3 +7,4 @@ msticpy
 pandas
 ruamel.yaml
 requests_html
+mistune>=2.0.3 # not directly required, pinned by Snyk to avoid a vulnerability