diff --git a/setup.py b/setup.py
index 15d0aaa..1a9b986 100644
--- a/setup.py
+++ b/setup.py
@@ -21,7 +21,8 @@ requirements = [
     'zope.sqlalchemy',
     'waitress',
     'bcrypt',
-    'deform'
+    'deform',
+    'PyYAML',
 ]
 
 setup_requirements = [