diff --git a/requirements.txt b/requirements.txt
index 5901c39..de413cd 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -3,3 +3,4 @@ torchvision==0.2.2.post3
 scikit-image==0.14.2
 numpy==1.16.2
 numpydoc==0.8.0
+pillow>=8.0.1 # not directly required, pinned by Snyk to avoid a vulnerability