diff --git a/apps/response/serializers/answer_sheet.py b/apps/response/serializers/answer_sheet.py
index 0af1cca0..03a8279c 100644
--- a/apps/response/serializers/answer_sheet.py
+++ b/apps/response/serializers/answer_sheet.py
@@ -49,5 +49,7 @@ def to_representation(self, instance):
 
     class Meta:
         model = AnswerSheet
-        fields = ['id', 'answer_sheet_type', 'user', 'form']
-        read_only_fields = ['id', 'answer_sheet_type']
+        fields = ['id', 'answer_sheet_type', 'user',
+                  'form', 'created_at', 'updated_at']
+        read_only_fields = ['id', 'answer_sheet_type',
+                            'created_at', 'updated_at']