diff --git a/docs/requirements.txt b/docs/requirements.txt
index db39cc3..d5ff3f9 100644
--- a/docs/requirements.txt
+++ b/docs/requirements.txt
@@ -1,3 +1,4 @@
 numpy
 pandas
-handwriting-sample
\ No newline at end of file
+handwriting-sample
+fonttools>=4.43.0 # not directly required, pinned by Snyk to avoid a vulnerability
\ No newline at end of file