diff --git a/backend/ticket/serializers.py b/backend/ticket/serializers.py
index 63f07d2..4f6f91d 100644
--- a/backend/ticket/serializers.py
+++ b/backend/ticket/serializers.py
@@ -22,7 +22,7 @@ class AttachmentSerializer(serializers.ModelSerializer):
 
 class MessageSerializer(serializers.ModelSerializer):
     is_user = serializers.SerializerMethodField(read_only=True)
-    attachments = AttachmentSerializer(many=True)
+    attachments = AttachmentSerializer(many=True, read_only=True)
     class Meta:
         model = Message
         exclude = ('sender', )