diff --git a/apps/participation/api/serializers.py b/apps/participation/api/serializers.py
index 6e87aa9..0858030 100644
--- a/apps/participation/api/serializers.py
+++ b/apps/participation/api/serializers.py
@@ -25,7 +25,7 @@ class PassageSerializer(serializers.ModelSerializer):
 
 
 class PoolSerializer(serializers.ModelSerializer):
-    passages = serializers.ListSerializer(child=PassageSerializer())
+    passages = serializers.ListSerializer(child=PassageSerializer(), read_only=True)
 
     class Meta:
         model = Pool