diff --git a/requirements.txt b/requirements.txt
index 4201a37..067aacf 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -6,3 +6,6 @@ fsspec
 pysolr
 oaklib
 wget
+fonttools>=4.43.0 # not directly required, pinned by Snyk to avoid a vulnerability
+numpy>=1.22.2 # not directly required, pinned by Snyk to avoid a vulnerability
+pillow>=10.3.0 # not directly required, pinned by Snyk to avoid a vulnerability