diff --git a/grok-versions.cfg b/grok-versions.cfg
index aa3634c..612364d 100644
--- a/grok-versions.cfg
+++ b/grok-versions.cfg
@@ -65,6 +65,8 @@ Chameleon = 4.4.4
 importlib-metadata = 7.0.0
 importlib-resources = 6.1.1
 zipp = 3.17.0
+# newer versions of waitress require Python 3.9+
+waitress = 3.0.0
 
 [versions:python39]
 importlib-metadata = 7.0.0