diff --git a/requirements/main.txt b/requirements/main.txt
index d43f4fa..b95f998 100644
--- a/requirements/main.txt
+++ b/requirements/main.txt
@@ -10,5 +10,5 @@ pyramid_layout
 pyramid_tm
 sqlalchemy-utils
 transaction
-waitress
+waitress==1.0.2
 zope.sqlalchemy