diff --git a/requirements.txt b/requirements.txt
index 3601f90..f07086c 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -5,3 +5,4 @@ pandas
 python-catmaid
 jsonpath-rw
 pyyaml
+pillow>=10.0.1 # not directly required, pinned by Snyk to avoid a vulnerability