diff --git a/requirements.txt b/requirements.txt
index 8cdde272..91bfe956 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,4 +1,6 @@
 # deps, generated via pipdeptree --exclude setuptools,wheel,pipdeptree,pip -f | tr '[:upper:]' '[:lower:]'
+# pin setuptools: https://github.com/Pylons/pyramid/issues/3731
+setuptools==80.9.0
 
 alembic==1.13.1
   mako==1.3.10