diff --git a/fastbook/requirements.txt b/fastbook/requirements.txt
index c2ccbf4..d3d36b1 100644
--- a/fastbook/requirements.txt
+++ b/fastbook/requirements.txt
@@ -7,3 +7,4 @@ pandas
 scikit_learn
 azure-cognitiveservices-search-imagesearch
 sentencepiece
+fonttools>=4.61.0 # not directly required, pinned by Snyk to avoid a vulnerability