diff --git a/common.go b/common.go
index 0eb9f37..c8c58b6 100755
--- a/common.go
+++ b/common.go
@@ -333,6 +333,7 @@ const (
 	StreamSeqByteSize       = 4
 	StreamFlagByteSize      = 1
 	ExpireByteSize          = 4
+	NodeIdByteSize          = 8
 )
 
 const (
diff --git a/connack.go b/connack.go
index fd0c571..415ac19 100755
--- a/connack.go
+++ b/connack.go
@@ -14,6 +14,7 @@ type ConnackPacket struct {
 	Salt          string     // salt
 	TimeDiff      int64      // 客户端时间与服务器的差值，单位毫秒。
 	ReasonCode    ReasonCode // 原因码
+	NodeId        uint64     // 节点Id
 }
 
 // GetFrameType 获取包类型
@@ -32,6 +33,9 @@ func encodeConnack(connack *ConnackPacket, enc *Encoder, version uint8) error {
 	_ = enc.WriteByte(connack.ReasonCode.Byte())
 	enc.WriteString(connack.ServerKey)
 	enc.WriteString(connack.Salt)
+	if version >= 4 {
+		enc.WriteUint64(connack.NodeId)
+	}
 	return nil
 }
 
@@ -44,6 +48,9 @@ func encodeConnackSize(packet *ConnackPacket, version uint8) int {
 	size += ReasonCodeByteSize
 	size += (len(packet.ServerKey) + StringFixLenByteSize)
 	size += (len(packet.Salt) + StringFixLenByteSize)
+	if version >= 4 {
+		size += NodeIdByteSize
+	}
 	return size
 }
 
@@ -76,5 +83,11 @@ func decodeConnack(frame Frame, data []byte, version uint8) (Frame, error) {
 		return nil, errors.Wrap(err, "解码Salt失败！")
 	}
 
+	if version >= 4 {
+		if connackPacket.NodeId, err = dec.Uint64(); err != nil {
+			return nil, errors.Wrap(err, "解码NodeId失败！")
+		}
+	}
+
 	return connackPacket, nil
 }
diff --git a/go.mod b/go.mod
index ed5ac84..49990d6 100644
--- a/go.mod
+++ b/go.mod
@@ -5,6 +5,7 @@ go 1.18
 require (
 	github.com/pkg/errors v0.9.1
 	github.com/stretchr/testify v1.8.4
+	github.com/valyala/bytebufferpool v1.0.0
 )
 
 require (
diff --git a/go.sum b/go.sum
index 57d96e6..663ac41 100644
--- a/go.sum
+++ b/go.sum
@@ -6,6 +6,8 @@ github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZb
 github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
 github.com/stretchr/testify v1.8.4 h1:CcVxjf3Q8PM0mHUKJCdn+eZZtm5yQwehR5yeSVQQcUk=
 github.com/stretchr/testify v1.8.4/go.mod h1:sz/lmYIOXD/1dqDmKjjqLyZ2RngseejIcXlSw2iwfAo=
+github.com/valyala/bytebufferpool v1.0.0 h1:GqA5TC/0021Y/b9FG4Oi9Mr3q7XYx6KllzawFIhcdPw=
+github.com/valyala/bytebufferpool v1.0.0/go.mod h1:6bBcMArwyJ5K/AmCkWv1jt77kVWyCJ6HpOuEn7z0Csc=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405 h1:yhCVgyC4o1eVCa2tZl7eS0r+SDo693bJlVdllGtEeKM=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
diff --git a/protocol.go b/protocol.go
index 05ab7bf..788560f 100755
--- a/protocol.go
+++ b/protocol.go
@@ -27,7 +27,7 @@ type WKProto struct {
 }
 
 // LatestVersion 最新版本
-const LatestVersion = 3
+const LatestVersion = 4
 
 // MaxRemaingLength 最大剩余长度 // 1<<28 - 1
 const MaxRemaingLength uint32 = 1024 * 1024