diff --git a/README.md b/README.md
index afe4c5b..2b25de1 100644
--- a/README.md
+++ b/README.md
@@ -1,6 +1,6 @@
 # Go-MC
-![Version](https://img.shields.io/badge/Minecraft-1.14.4-blue.svg)
-![Protocol](https://img.shields.io/badge/Protocol-498-blue.svg)
+![Version](https://img.shields.io/badge/Minecraft-1.15-blue.svg)
+![Protocol](https://img.shields.io/badge/Protocol-573-blue.svg)
 [![GoDoc](https://godoc.org/github.com/Tnze/go-mc?status.svg)](https://godoc.org/github.com/Tnze/go-mc)
 [![Go Report Card](https://goreportcard.com/badge/github.com/Tnze/go-mc)](https://goreportcard.com/report/github.com/Tnze/go-mc)
 [![Build Status](https://travis-ci.org/Tnze/go-mc.svg?branch=master)](https://travis-ci.org/Tnze/go-mc)
diff --git a/bot/ingame.go b/bot/ingame.go
index b5ea495..1f7acd2 100644
--- a/bot/ingame.go
+++ b/bot/ingame.go
@@ -328,12 +328,14 @@ func handleJoinGamePacket(c *Client, p pk.Packet) error {
 		eid          pk.Int
 		gamemode     pk.UnsignedByte
 		dimension    pk.Int
+		hashedSeed   pk.Long
 		maxPlayers   pk.UnsignedByte
 		levelType    pk.String
 		viewDistance pk.VarInt
-		rdi          pk.Boolean
+		rdi          pk.Boolean // Reduced Debug Info
+		ers          pk.Boolean // Enable respawn screen
 	)
-	err := p.Scan(&eid, &gamemode, &dimension, &maxPlayers, &levelType, &rdi)
+	err := p.Scan(&eid, &gamemode, &dimension, &hashedSeed, &maxPlayers, &levelType, &rdi, &ers)
 	if err != nil {
 		return err
 	}
@@ -443,7 +445,7 @@ func handleChunkDataPacket(c *Client, p pk.Packet) error {
 		Data           chunkData
 		BlockEntities  blockEntities
 	)
-
+	// TODO: Biomes data in this packet
 	if err := p.Scan(&X, &Z, &FullChunk, &PrimaryBitMask, pk.NBT{V: &Heightmaps}, &Data, &BlockEntities); err != nil {
 		return err
 	}
diff --git a/bot/mcbot.go b/bot/mcbot.go
index 2e05d78..65db5f1 100644
--- a/bot/mcbot.go
+++ b/bot/mcbot.go
@@ -11,7 +11,7 @@ import (
 )
 
 // ProtocolVersion , the protocol version number of minecraft net protocol
-const ProtocolVersion = 498
+const ProtocolVersion = 573
 
 // JoinServer connect a Minecraft server for playing the game.
 func (c *Client) JoinServer(addr string, port int) (err error) {
diff --git a/data/packetIDs.go b/data/packetIDs.go
index f003c20..2f349d0 100644
--- a/data/packetIDs.go
+++ b/data/packetIDs.go
@@ -10,6 +10,7 @@ const (
 	SpawnPlayer
 	AnimationClientbound
 	Statistics
+	AcknowledgePlayerDigging
 	BlockBreakAnimation
 	UpdateBlockEntity
 	BlockAction
@@ -17,9 +18,9 @@ const (
 	BossBar
 	ServerDifficulty
 	ChatMessageClientbound
-	MultiBlockChange
 
-	TabComplete //0x10
+	MultiBlockChange //0x10
+	TabComplete
 	DeclareCommands
 	ConfirmTransaction
 	CloseWindow
@@ -34,9 +35,9 @@ const (
 	Explosion
 	UnloadChunk
 	ChangeGameState
-	OpenHorseWindow
 
-	KeepAliveClientbound //0x20
+	OpenHorseWindow //0x20
+	KeepAliveClientbound
 	ChunkData
 	Effect
 	Particle
@@ -51,9 +52,9 @@ const (
 	VehicleMoveClientbound
 	OpenBook
 	OpenWindow
-	OpenSignEditor
 
-	CraftRecipeResponse //0x30
+	OpenSignEditor //0x30
+	CraftRecipeResponse
 	PlayerAbilitiesClientbound
 	CombatEvent
 	PlayerInfo
@@ -68,9 +69,9 @@ const (
 	SelectAdvancementTab
 	WorldBorder
 	Camera
-	HeldItemChangeClientbound
 
-	UpdateViewPosition //0x40
+	HeldItemChangeClientbound //0x40
+	UpdateViewPosition
 	UpdateViewDistance
 	DisplayScoreboard
 	EntityMetadata
@@ -85,9 +86,9 @@ const (
 	UpdateScore
 	SpawnPosition
 	TimeUpdate
-	Title
 
-	EntitySoundEffect //0x50
+	Title //0x50
+	EntitySoundEffect
 	SoundEffect
 	StopSound
 	PlayerListHeaderAndFooter
@@ -98,8 +99,7 @@ const (
 	EntityProperties
 	EntityEffect
 	DeclareRecipes
-	Tags
-	AcknowledgePlayerDigging //0x5C
+	Tags //0x5C
 )
 
 // Serverbound packet IDs
diff --git a/net/packet/packet.go b/net/packet/packet.go
index 1e99def..c863ac8 100644
--- a/net/packet/packet.go
+++ b/net/packet/packet.go
@@ -63,7 +63,7 @@ func (p *Packet) Pack(threshold int) (pack []byte) {
 	return
 }
 
-// RecvPacket recive a packet from server
+// RecvPacket receive a packet from server
 func RecvPacket(r io.ByteReader, useZlib bool) (*Packet, error) {
 	var len int
 	for i := 0; i < 5; i++ { //读数据前的长度标记
@@ -71,7 +71,7 @@ func RecvPacket(r io.ByteReader, useZlib bool) (*Packet, error) {
 		if err != nil {
 			return nil, fmt.Errorf("read len of packet fail: %v", err)
 		}
-		len |= (int(b&0x7F) << uint(7*i))
+		len |= int(b&0x7F) << uint(7*i)
 		if b&0x80 == 0 {
 			break
 		}