diff --git a/requirements.txt b/requirements.txt
index be0b7f4..40b2628 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -25,3 +25,4 @@ WebOb==1.8.7
 zope.deprecation==4.3.0
 zope.interface==6.1
 crossrefapi==1.3.0
+setuptools>=78.1.1 # not directly required, pinned by Snyk to avoid a vulnerability