diff --git a/tests/data/bid/auction_bid_example_v1.json b/tests/data/bid/auction_bid_example_v1.json
new file mode 100644
index 0000000..f4cc080
--- /dev/null
+++ b/tests/data/bid/auction_bid_example_v1.json
@@ -0,0 +1,14 @@
+{
+  "bonding_purse": "uref-b3c03358245a0d9514064b6d0c3dd90023d29a0fe137507d430a26990f5ce8e3-007",
+  "staked_amount": "900000000000",
+  "delegation_rate": 10,
+  "delegators": [
+    {
+      "public_key": "01d829cbfb66b2b11ef8d8feb6d3f2155789fc22f407bb57f89b05f6ba4b9ae070",
+      "staked_amount": "555000000000",
+      "bonding_purse": "uref-41059a3aa5c5759c7f5e3c826cb47e0b21257ac57ee63a4c00dc305133e55d64-007",
+      "delegatee": "01197f6b23e16c8532c6abc838facd5ea789be0c76b2920334039bfa8b3d368d61"
+    }
+  ],
+  "inactive": false
+}
\ No newline at end of file
diff --git a/tests/data/bid/auction_bid_example_v2.json b/tests/data/bid/auction_bid_example_v2.json
new file mode 100644
index 0000000..e5b3949
--- /dev/null
+++ b/tests/data/bid/auction_bid_example_v2.json
@@ -0,0 +1,20 @@
+{
+  "validator_public_key": "01197f6b23e16c8532c6abc838facd5ea789be0c76b2920334039bfa8b3d368d61",
+  "bonding_purse": "uref-fafafafafafafafafafafafafafafafafafafafafafafafafafafafafafafafa-007",
+  "staked_amount": "900000000000",
+  "delegation_rate": 0,
+  "vesting_schedule": null,
+  "delegators": [
+    {
+      "delegator_public_key": "014508a07aa941707f3eb2db94c8897a80b2c1197476b6de213ac273df7d86c4ff",
+      "delegator": {
+        "delegator_public_key": "01d829cbfb66b2b11ef8d8feb6d3f2155789fc22f407bb57f89b05f6ba4b9ae070",
+        "staked_amount": "10",
+        "bonding_purse": "uref-fbfbfbfbfbfbfbfbfbfbfbfbfbfbfbfbfbfbfbfbfbfbfbfbfbfbfbfbfbfbfbfb-007",
+        "validator_public_key": "01197f6b23e16c8532c6abc838facd5ea789be0c76b2920334039bfa8b3d368d61",
+        "vesting_schedule": null
+      }
+    }
+  ],
+  "inactive": false
+}
\ No newline at end of file
diff --git a/tests/types/bid_test.go b/tests/types/bid_test.go
new file mode 100644
index 0000000..d46e6b9
--- /dev/null
+++ b/tests/types/bid_test.go
@@ -0,0 +1,42 @@
+package types
+
+import (
+	"encoding/json"
+	"os"
+	"testing"
+
+	"github.com/stretchr/testify/require"
+
+	"github.com/make-software/casper-go-sdk/v2/types"
+)
+
+func Test_Bid_MarshalUnmarshal(t *testing.T) {
+	tests := []struct {
+		name        string
+		fixturePath string
+	}{
+		{
+			"Auction Bid V1",
+			"../data/bid/auction_bid_example_v1.json",
+		},
+		{
+			"Auction Bid V2",
+			"../data/bid/auction_bid_example_v2.json",
+		},
+	}
+	for _, test := range tests {
+		t.Run(test.name, func(t *testing.T) {
+			data, err := os.ReadFile(test.fixturePath)
+			require.NoError(t, err)
+
+			var bid types.Bid
+			err = json.Unmarshal(data, &bid)
+			require.NoError(t, err)
+
+			require.Equal(t, bid.StakedAmount.String(), "900000000000")
+			require.Equal(t, 1, len(bid.Delegators))
+			require.Equal(t, bid.Delegators[0].DelegatorPublicKey.ToHex(), "01d829cbfb66b2b11ef8d8feb6d3f2155789fc22f407bb57f89b05f6ba4b9ae070")
+			require.Equal(t, bid.Delegators[0].ValidatorPublicKey.ToHex(), "01197f6b23e16c8532c6abc838facd5ea789be0c76b2920334039bfa8b3d368d61")
+		})
+	}
+}
diff --git a/types/bid.go b/types/bid.go
index 49effd6..2987a53 100644
--- a/types/bid.go
+++ b/types/bid.go
@@ -54,11 +54,12 @@ func (d *Delegators) UnmarshalJSON(data []byte) error {
 	}
 
 	publicKeyAndDelegators := make([]struct {
-		DelegatorPublicKey keypair.PublicKey `json:"delegator_public_key"`
-		Delegator          Delegator         `json:"delegator"`
+		DelegatorPublicKey *keypair.PublicKey `json:"delegator_public_key"`
+		Delegator          Delegator          `json:"delegator"`
 	}, 0)
 
-	if err := json.Unmarshal(data, &publicKeyAndDelegators); err == nil && len(publicKeyAndDelegators) > 0 {
+	err := json.Unmarshal(data, &publicKeyAndDelegators)
+	if err == nil && len(publicKeyAndDelegators) > 0 && publicKeyAndDelegators[0].DelegatorPublicKey != nil {
 		delegators := make(Delegators, 0, len(publicKeyAndDelegators))
 		for _, item := range publicKeyAndDelegators {
 			delegators = append(delegators, item.Delegator)
@@ -68,11 +69,16 @@ func (d *Delegators) UnmarshalJSON(data []byte) error {
 		return nil
 	}
 
-	delegators := make([]Delegator, 0)
-	if err := json.Unmarshal(data, &publicKeyAndDelegators); err != nil {
+	delegatorsV1 := make([]DelegatorV1, 0)
+	if err := json.Unmarshal(data, &delegatorsV1); err != nil {
 		return err
 	}
 
+	delegators := make(Delegators, 0, len(delegatorsV1))
+	for _, item := range delegatorsV1 {
+		delegators = append(delegators, NewDelegatorFromDelegatorV1(item))
+	}
+
 	*d = delegators
 	return nil
 }
@@ -91,6 +97,30 @@ type Delegator struct {
 	VestingSchedule *VestingSchedule `json:"vesting_schedule"`
 }
 
+// DelegatorV1 of version 1 which is associated with the given validator.
+type DelegatorV1 struct {
+	// The purse that was used for delegating.
+	BondingPurse key.URef `json:"bonding_purse"`
+	// Amount of Casper token (in motes) delegated
+	StakedAmount clvalue.UInt512 `json:"staked_amount"`
+	// Public Key of the validator
+	Delegatee keypair.PublicKey `json:"delegatee"`
+	// Public key of the delegator
+	PublicKey keypair.PublicKey `json:"public_key"`
+	// Vesting schedule for a genesis validator. `None` if non-genesis validator.
+	VestingSchedule *VestingSchedule `json:"vesting_schedule"`
+}
+
+func NewDelegatorFromDelegatorV1(v1 DelegatorV1) Delegator {
+	return Delegator{
+		BondingPurse:       v1.BondingPurse,
+		StakedAmount:       v1.StakedAmount,
+		DelegatorPublicKey: v1.PublicKey,
+		ValidatorPublicKey: v1.Delegatee,
+		VestingSchedule:    v1.VestingSchedule,
+	}
+}
+
 // Credit is a bridge record pointing to a new `ValidatorBid` after the public key was changed.
 type Credit struct {
 	// The era id the credit was created.