diff --git a/cbor/bytestring.go b/cbor/bytestring.go
index f2412bd7..e1b5c582 100644
--- a/cbor/bytestring.go
+++ b/cbor/bytestring.go
@@ -16,34 +16,23 @@ package cbor
 
 import (
 	"encoding/hex"
+
+	_cbor "github.com/fxamacker/cbor/v2"
 )
 
 // Wrapper for bytestrings that allows them to be used as keys for a map
-// We use a string because []byte isn't comparable, which means it can't be used as a map key
-type ByteString string
+// This was originally a full implementation, but now it just extends the upstream
+// type
+type ByteString struct {
+	_cbor.ByteString
+}
 
 func NewByteString(data []byte) ByteString {
-	bs := ByteString(data)
+	bs := ByteString{ByteString: _cbor.ByteString(data)}
 	return bs
 }
 
-func (bs *ByteString) UnmarshalCBOR(data []byte) error {
-	tmpValue := []byte{}
-	if _, err := Decode(data, &tmpValue); err != nil {
-		return err
-	}
-	*bs = ByteString(tmpValue)
-	return nil
-}
-
-func (bs ByteString) MarshalCBOR() ([]byte, error) {
-	return Encode([]byte(bs))
-}
-
-func (bs ByteString) Bytes() []byte {
-	return []byte(bs)
-}
-
+// String returns a hex-encoded representation of the bytestring
 func (bs ByteString) String() string {
-	return hex.EncodeToString([]byte(bs))
+	return hex.EncodeToString(bs.Bytes())
 }
diff --git a/cbor/value_test.go b/cbor/value_test.go
index 4ad92192..a8436569 100644
--- a/cbor/value_test.go
+++ b/cbor/value_test.go
@@ -18,6 +18,7 @@ import (
 	"encoding/hex"
 	"encoding/json"
 	"fmt"
+	"io"
 	"math/big"
 	"reflect"
 	"strings"
@@ -43,7 +44,7 @@ var testDefs = []struct {
 	{
 		cborHex:             "81",
 		expectedObject:      nil,
-		expectedDecodeError: fmt.Errorf("EOF"),
+		expectedDecodeError: io.ErrUnexpectedEOF,
 	},
 	// Invalid map key type
 	{
diff --git a/go.mod b/go.mod
index a6d18603..96b00443 100644
--- a/go.mod
+++ b/go.mod
@@ -3,7 +3,7 @@ module github.com/blinklabs-io/gouroboros
 go 1.20
 
 require (
-	github.com/fxamacker/cbor/v2 v2.4.0
+	github.com/fxamacker/cbor/v2 v2.5.0
 	github.com/jinzhu/copier v0.4.0
 	golang.org/x/crypto v0.13.0
 )
diff --git a/go.sum b/go.sum
index 6ede5b8c..54c98a99 100644
--- a/go.sum
+++ b/go.sum
@@ -1,5 +1,5 @@
-github.com/fxamacker/cbor/v2 v2.4.0 h1:ri0ArlOR+5XunOP8CRUowT0pSJOwhW098ZCUyskZD88=
-github.com/fxamacker/cbor/v2 v2.4.0/go.mod h1:TA1xS00nchWmaBnEIxPSE5oHLuJBAVvqrtAnWBwBCVo=
+github.com/fxamacker/cbor/v2 v2.5.0 h1:oHsG0V/Q6E/wqTS2O1Cozzsy69nqCiguo5Q1a1ADivE=
+github.com/fxamacker/cbor/v2 v2.5.0/go.mod h1:TA1xS00nchWmaBnEIxPSE5oHLuJBAVvqrtAnWBwBCVo=
 github.com/jinzhu/copier v0.4.0 h1:w3ciUoD19shMCRargcpm0cm91ytaBhDvuRpz1ODO/U8=
 github.com/jinzhu/copier v0.4.0/go.mod h1:DfbEm0FYsaqBcKcFuvmOZb218JkPGtvSHsKg8S8hyyg=
 github.com/x448/float16 v0.8.4 h1:qLwI1I70+NjRFUR3zs1JPUCgaCXSh3SW62uAKT1mSBM=
diff --git a/ledger/common.go b/ledger/common.go
index 2f3080da..111cb0d1 100644
--- a/ledger/common.go
+++ b/ledger/common.go
@@ -105,7 +105,7 @@ func (m MultiAsset[T]) MarshalJSON() ([]byte, error) {
 	for policyId, policyData := range m.data {
 		for assetName, amount := range policyData {
 			tmpObj := multiAssetJson[T]{
-				Name:        string(assetName),
+				Name:        string(assetName.Bytes()),
 				NameHex:     hex.EncodeToString(assetName.Bytes()),
 				Amount:      amount,
 				PolicyId:    policyId.String(),
@@ -142,7 +142,7 @@ func (m *MultiAsset[T]) Asset(policyId Blake2b224, assetName []byte) T {
 	if !ok {
 		return 0
 	}
-	return policy[cbor.ByteString(assetName)]
+	return policy[cbor.NewByteString(assetName)]
 }
 
 type AssetFingerprint struct {
diff --git a/ledger/common_test.go b/ledger/common_test.go
index 921ff17f..2c9e9435 100644
--- a/ledger/common_test.go
+++ b/ledger/common_test.go
@@ -57,7 +57,7 @@ func TestMultiAssetJson(t *testing.T) {
 			multiAssetObj: MultiAsset[MultiAssetTypeOutput]{
 				data: map[Blake2b224]map[cbor.ByteString]MultiAssetTypeOutput{
 					NewBlake2b224(test.DecodeHexString("29a8fb8318718bd756124f0c144f56d4b4579dc5edf2dd42d669ac61")): {
-						cbor.ByteString(test.DecodeHexString("6675726e697368613239686e")): 123456,
+						cbor.NewByteString(test.DecodeHexString("6675726e697368613239686e")): 123456,
 					},
 				},
 			},
@@ -67,7 +67,7 @@ func TestMultiAssetJson(t *testing.T) {
 			multiAssetObj: MultiAsset[MultiAssetTypeOutput]{
 				data: map[Blake2b224]map[cbor.ByteString]MultiAssetTypeOutput{
 					NewBlake2b224(test.DecodeHexString("eaf8042c1d8203b1c585822f54ec32c4c1bb4d3914603e2cca20bbd5")): {
-						cbor.ByteString(test.DecodeHexString("426f7764757261436f6e63657074733638")): 234567,
+						cbor.NewByteString(test.DecodeHexString("426f7764757261436f6e63657074733638")): 234567,
 					},
 				},
 			},
@@ -77,7 +77,7 @@ func TestMultiAssetJson(t *testing.T) {
 			multiAssetObj: MultiAsset[MultiAssetTypeOutput]{
 				data: map[Blake2b224]map[cbor.ByteString]MultiAssetTypeOutput{
 					NewBlake2b224(test.DecodeHexString("cf78aeb9736e8aa94ce8fab44da86b522fa9b1c56336b92a28420525")): {
-						cbor.ByteString(test.DecodeHexString("363438346330393264363164373033656236333233346461")): 12345678,
+						cbor.NewByteString(test.DecodeHexString("363438346330393264363164373033656236333233346461")): 12345678,
 					},
 				},
 			},
diff --git a/ledger/mary_test.go b/ledger/mary_test.go
index ecdc83ad..63ccfefc 100644
--- a/ledger/mary_test.go
+++ b/ledger/mary_test.go
@@ -27,7 +27,7 @@ func createMaryTransactionOutputValueAssets(policyId []byte, assetName []byte, a
 	data := map[Blake2b224]map[cbor.ByteString]uint64{}
 	policyIdKey := Blake2b224{}
 	copy(policyIdKey[:], policyId)
-	assetKey := cbor.ByteString(assetName)
+	assetKey := cbor.NewByteString(assetName)
 	data[policyIdKey] = map[cbor.ByteString]uint64{
 		assetKey: amount,
 	}
diff --git a/protocol/protocol.go b/protocol/protocol.go
index eb9cd06e..d3ca5c32 100644
--- a/protocol/protocol.go
+++ b/protocol/protocol.go
@@ -330,7 +330,7 @@ func (p *Protocol) recvLoop() {
 		var tmpMsg []cbor.RawMessage
 		numBytesRead, err := cbor.Decode(p.recvBuffer.Bytes(), &tmpMsg)
 		if err != nil {
-			if err == io.EOF && p.recvBuffer.Len() > 0 {
+			if err == io.ErrUnexpectedEOF && p.recvBuffer.Len() > 0 {
 				// This is probably a multi-part message, so we wait until we get more of the message
 				// before trying to process it
 				p.recvReadyChan <- true