diff --git a/requirements.txt b/requirements.txt
index 89d64c3034..f85def9435 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,2 +1,3 @@
 mkdocs==1.0.4
 mkdocs-material==4.0.2
+pygments>=2.7.4 # not directly required, pinned by Snyk to avoid a vulnerability