diff --git a/requirements.txt b/requirements.txt
index 2b0dbc7..c3810ea 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -3,3 +3,4 @@ markata
 markupsafe==2.0.1
 rich
 textual
+pymdown-extensions>=10.16.1 # not directly required, pinned by Snyk to avoid a vulnerability