diff --git a/docs/requirements.txt b/docs/requirements.txt
index c3dc118dbb..68cc1d31c4 100644
--- a/docs/requirements.txt
+++ b/docs/requirements.txt
@@ -6,3 +6,4 @@ sphinxcontrib.bibtex
 matplotlib
 pyparsing<3,>=2.0.2
 sphinx_gallery
+pillow>=10.0.1 # not directly required, pinned by Snyk to avoid a vulnerability