diff --git a/requirements.txt b/requirements.txt
index 57e51617b..61d022f82 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -14,3 +14,4 @@ pytest-mpl
 codecov
 pillow>=10.0.1 # not directly required, pinned by Snyk to avoid a vulnerability
 setuptools>=65.5.1 # not directly required, pinned by Snyk to avoid a vulnerability
+fonttools>=4.43.0 # not directly required, pinned by Snyk to avoid a vulnerability