diff --git a/requirements.txt b/requirements.txt
index fda9f56..c45bd51 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -12,3 +12,4 @@ mkdocstrings==0.16.2
 # xlwings
 # cannlytics
 # git+https://github.com/cannlytics/cannlytics.git
+pymdown-extensions>=10.0 # not directly required, pinned by Snyk to avoid a vulnerability