diff --git a/requirements-dev.txt b/requirements-dev.txt
index 7dca248..9d648e0 100644
--- a/requirements-dev.txt
+++ b/requirements-dev.txt
@@ -1,3 +1,7 @@
+# Python 3.12+ no longer bundles setuptools in venvs.
+# Pyramid imports pkg_resources which lives in setuptools.
+setuptools
+
 # bpython shell and teach pyramid about it.
 bpython
 pyramid_bpython