diff --git a/api/s9_demands.py b/api/s9_demands.py
index 1c01a73..13fc0d7 100644
--- a/api/s9_demands.py
+++ b/api/s9_demands.py
@@ -113,7 +113,7 @@ def inp_in_demand(section: list[str]) -> ChangeSet:
 
     cs = ChangeSet()
     for junction, demands in objs.items():
-        obj_cs = {'operation': API_ADD, 'type': 'demand', 'junction' : junction, 'demands' : []}
+        obj_cs = {'operation': API_UPDATE, 'type': 'demand', 'junction' : junction, 'demands' : []}
         for obj in demands:
             obj_cs['demands'].append({'demand': obj.demand, 'pattern' : obj.pattern, 'category': obj.category})
         cs.append(obj_cs)