diff --git a/requirements-demo.txt b/requirements-demo.txt
index 0643b5c..f0f4295 100644
--- a/requirements-demo.txt
+++ b/requirements-demo.txt
@@ -3,3 +3,4 @@ datasketch>=1.5.1
 conllu>=4.2.1
 matplotlib>=3.3.3
 mmh3>=3.0.0
+pillow>=10.3.0 # not directly required, pinned by Snyk to avoid a vulnerability