diff --git a/mock_responses b/mock_responses
index 02d0831..4a069d1 160000
--- a/mock_responses
+++ b/mock_responses
@@ -1 +1 @@
-Subproject commit 02d0831c44d30a9f4ac647a3a2c89b3c0279f317
+Subproject commit 4a069d12778c226a6afaca205928dd391bde6ff5
diff --git a/orders.go b/orders.go
index 4e6149a..508b7bf 100644
--- a/orders.go
+++ b/orders.go
@@ -24,6 +24,7 @@ type Order struct {
 	ExchangeUpdateTimestamp models.Time            `json:"exchange_update_timestamp"`
 	ExchangeTimestamp       models.Time            `json:"exchange_timestamp"`
 	Variety                 string                 `json:"variety"`
+	Modified                bool                   `json:"modified"`
 	Meta                    map[string]interface{} `json:"meta"`
 
 	Exchange        string `json:"exchange"`
@@ -45,6 +46,8 @@ type Order struct {
 	PendingQuantity   float64 `json:"pending_quantity"`
 	CancelledQuantity float64 `json:"cancelled_quantity"`
 
+	AuctionNumber string `json:"auction_number"`
+
 	Tag  string   `json:"tag"`
 	Tags []string `json:"tags"`
 }
@@ -74,7 +77,7 @@ type OrderParams struct {
 	IcebergLegs int `url:"iceberg_legs,omitempty"`
 	IcebergQty  int `url:"iceberg_quantity,omitempty"`
 
-	AuctionNumber int `url:"auction_number,omitempty"`
+	AuctionNumber string `url:"auction_number,omitempty"`
 
 	Tag string `json:"tag" url:"tag,omitempty"`
 }
diff --git a/orders_test.go b/orders_test.go
index 676f3e1..cd340b6 100644
--- a/orders_test.go
+++ b/orders_test.go
@@ -20,15 +20,21 @@ func (ts *TestSuite) TestGetOrders(t *testing.T) {
 	})
 	t.Run("test tag parsing", func(t *testing.T) {
 		require.Equal(t, "", orders[0].Tag)
-		require.Equal(t, "connect test order1", orders[1].Tag)
-		require.Equal(t, []string{"connect test order2", "XXXXX"}, orders[2].Tags)
+		require.Equal(t, "connect test order1", orders[4].Tag)
+		require.Equal(t, []string{"connect test order2", "XXXXX"}, orders[5].Tags)
 	})
 	t.Run("test ice-berg and TTL orders", func(t *testing.T) {
 		require.Equal(t, "iceberg", orders[3].Variety)
+		require.Equal(t, false, orders[3].Modified)
 		require.Equal(t, "TTL", orders[3].Validity)
 		require.Equal(t, 200.0, orders[3].Meta["iceberg"].(map[string]interface{})["leg_quantity"])
 		require.Equal(t, 1000.0, orders[3].Meta["iceberg"].(map[string]interface{})["total_quantity"])
 	})
+	t.Run("test auction order", func(t *testing.T) {
+		require.Equal(t, "auction", orders[6].Variety)
+		require.Equal(t, "22", orders[6].AuctionNumber)
+		require.Equal(t, false, orders[6].Modified)
+	})
 }
 
 func (ts *TestSuite) TestGetTrades(t *testing.T) {
@@ -54,6 +60,9 @@ func (ts *TestSuite) TestGetOrderHistory(t *testing.T) {
 		if order.OrderID == "" {
 			t.Errorf("Error while fetching order id in order history. %v", err)
 		}
+		if order.Modified {
+			t.Errorf("Error for not modified order. %v", err)
+		}
 	}
 }
 
@@ -155,7 +164,7 @@ func (ts *TestSuite) TestPlaceAuctionOrder(t *testing.T) {
 		TransactionType: "test_auction",
 		Quantity:        100,
 		Price:           100,
-		AuctionNumber:   7359,
+		AuctionNumber:   "7359",
 		Tag:             "test_auction",
 	}
 	orderResponse, err := ts.KiteConnect.PlaceOrder("auction", params)