diff --git a/doc/source/requirements.txt b/doc/source/requirements.txt
index 869964a7d..1322ce74c 100644
--- a/doc/source/requirements.txt
+++ b/doc/source/requirements.txt
@@ -10,3 +10,4 @@ numpy
 scipy
 pandas
 matplotlib
+setuptools>=78.1.1 # not directly required, pinned by Snyk to avoid a vulnerability