diff --git a/requirements.txt b/requirements.txt
index 3601f90..5fde8a9 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -5,3 +5,6 @@ pandas
 python-catmaid
 jsonpath-rw
 pyyaml
+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