diff --git a/build.gradle.kts b/build.gradle.kts
index 66534f9..bd5abe0 100644
--- a/build.gradle.kts
+++ b/build.gradle.kts
@@ -1,18 +1,20 @@
+import io.papermc.paperweight.userdev.ReobfArtifactConfiguration
 import org.apache.tools.ant.filters.ReplaceTokens
 
 plugins {
     kotlin("jvm") version "1.9.22"
     kotlin("plugin.serialization") version "1.9.22"
-    id("com.github.johnrengelman.shadow") version "7.0.0"
+    id("io.github.goooler.shadow") version "8.1.8"
+    id("io.papermc.paperweight.userdev") version "1.7.1"
     java
     `maven-publish`
 }
 
 group = "net.azisaba"
-version = "1.15.2+6.16.3"
+version = "1.20.2+6.16.3"
 
 java {
-    toolchain.languageVersion.set(JavaLanguageVersion.of(8))
+    toolchain.languageVersion.set(JavaLanguageVersion.of(17))
 
     withJavadocJar()
     withSourcesJar()
@@ -68,20 +70,22 @@ dependencies {
     compileOnly("net.azisaba:RyuZUPluginChat:4.2.0")
     compileOnly("net.azisaba.rarity:api:1.0.1-SNAPSHOT")
     compileOnly("net.azisaba:ItemStash:1.0.0-SNAPSHOT")
-    //noinspection VulnerableLibrariesLocal
-    compileOnly("com.destroystokyo.paper:paper-api:1.15.2-R0.1-SNAPSHOT")
-    compileOnly("org.spigotmc:spigot:1.15.2-R0.1-SNAPSHOT")
     compileOnly("io.lumine:Mythic-Dist:4.13.0")
     compileOnly("com.github.MilkBowl:VaultAPI:1.7")
     compileOnly("com.github.MyPetORG.MyPet:mypet-api:5c8ceeac6a")
     compileOnly("de.keyle:knbt:0.0.5")
     compileOnly("com.github.Staartvin:Autorank-2:4.5.1")
+    //compileOnly("org.spigotmc:spigot-api:1.20.2-R0.1-SNAPSHOT")
+    compileOnly("io.papermc.paper:paper-api:1.20.2-R0.1-SNAPSHOT")
     compileOnly("com.github.Staartvin:Statz:v1.5.5") {
         exclude("nl.lolmewn.stats", "Stats")
         exclude("me.staartvin", "PluginLibrary")
     }
+    paperweight.paperDevBundle("1.20.2-R0.1-SNAPSHOT")
 }
 
+paperweight.reobfArtifactConfiguration.set(ReobfArtifactConfiguration.REOBF_PRODUCTION)
+
 publishing {
     repositories {
         maven {
diff --git a/settings.gradle.kts b/settings.gradle.kts
index 1ae12d9..9205142 100644
--- a/settings.gradle.kts
+++ b/settings.gradle.kts
@@ -6,3 +6,7 @@ buildscript {
         gradlePluginPortal()
     }
 }
+
+plugins {
+    id("org.gradle.toolchains.foojay-resolver-convention") version("0.8.0")
+}
diff --git a/src/main/java/com/github/mori01231/lifecore/LifeCore.kt b/src/main/java/com/github/mori01231/lifecore/LifeCore.kt
index 1e1bcd7..904da6e 100644
--- a/src/main/java/com/github/mori01231/lifecore/LifeCore.kt
+++ b/src/main/java/com/github/mori01231/lifecore/LifeCore.kt
@@ -20,14 +20,12 @@ import org.bukkit.Bukkit
 import org.bukkit.command.CommandExecutor
 import org.bukkit.entity.ItemFrame
 import org.bukkit.plugin.java.JavaPlugin
-import org.bukkit.plugin.java.PluginClassLoader
 import java.io.File
 import java.io.IOException
 import java.net.InetSocketAddress
-import java.nio.file.Files
 import java.util.concurrent.Executor
 import java.util.concurrent.Executors
-import java.util.stream.Collectors
+import java.util.logging.Level
 
 class LifeCore : JavaPlugin() {
     val gcListener = GCListener(this)
@@ -38,7 +36,7 @@ class LifeCore : JavaPlugin() {
     val asyncExecutor = Executor { Bukkit.getScheduler().runTaskAsynchronously(this, it) }
     val lifeCoreConfig = LifeCoreConfig.load(this)
     val playerRegionManager = PlayerRegionManager()
-    val dataLoader = DataLoader(slF4JLogger, getAsFileSystem().getPath("/data"))
+    val dataLoader = DataLoader(logger, getAsFileSystem().getPath("/data"))
     private var databaseConfig: DatabaseConfig? = null
     lateinit var voteConfig: VoteConfig
         private set
@@ -175,7 +173,7 @@ class LifeCore : JavaPlugin() {
                 PlayerUtil.getChannel(player).pipeline()
                     .addBefore("packet_handler", "lifecore", PacketHandler(player))
             } catch (e: Exception) {
-                slF4JLogger.warn("Failed to inject channel handler to player " + player.name, e)
+                logger.log(Level.WARNING, "Failed to inject channel handler to player " + player.name, e)
             }
         }
 
@@ -321,13 +319,13 @@ class LifeCore : JavaPlugin() {
             Class.forName("de.Keyle.MyPet.MyPetApi")
             pm.registerEvents(CancelPetClickListener(), this)
         } catch (e: ClassNotFoundException) {
-            slF4JLogger.warn("MyPet not detected, skipping event listener registration")
+            logger.warning("MyPet not detected, skipping event listener registration")
         }
         try {
             Class.forName("com.vexsoftware.votifier.model.VotifierEvent")
             pm.registerEvents(VoteListener(this), this)
         } catch (e: ClassNotFoundException) {
-            slF4JLogger.warn("Votifier not detected, skipping event listener registration")
+            logger.warning("Votifier not detected, skipping event listener registration")
         }
         try {
             Class.forName("com.palmergames.bukkit.towny.TownyAPI")
@@ -336,21 +334,20 @@ class LifeCore : JavaPlugin() {
                 .apply { startTask() }
                 .apply { pm.registerEvents(this, this@LifeCore) }
         } catch (e: ClassNotFoundException) {
-            slF4JLogger.warn("Towny not detected, skipping event listener registration")
-            e.printStackTrace()
+            logger.log(Level.WARNING, "Towny not detected, skipping event listener registration", e)
         }
         try {
             Class.forName("net.azisaba.ryuzupluginchat.event.AsyncGlobalMessageEvent")
             pm.registerEvents(FilterNgWordsListener(this), this)
         } catch (e: ClassNotFoundException) {
-            slF4JLogger.warn("RyuZUPluginChat not detected, skipping event listener registration")
+            logger.warning("RyuZUPluginChat not detected, skipping event listener registration")
         }
         try {
             Class.forName("net.azisaba.rarity.api.RarityAPI")
             Class.forName("net.azisaba.itemstash.ItemStash")
             pm.registerEvents(DropProtectListener(this), this)
         } catch (e: ClassNotFoundException) {
-            slF4JLogger.warn("Rarity and/or ItemStash not detected, skipping event listener registration")
+            logger.warning("Rarity and/or ItemStash not detected, skipping event listener registration")
         }
     }
 
diff --git a/src/main/java/com/github/mori01231/lifecore/TrashInventory.kt b/src/main/java/com/github/mori01231/lifecore/TrashInventory.kt
index 7af33fc..e38c1fb 100644
--- a/src/main/java/com/github/mori01231/lifecore/TrashInventory.kt
+++ b/src/main/java/com/github/mori01231/lifecore/TrashInventory.kt
@@ -6,7 +6,6 @@ import org.bukkit.ChatColor
 import org.bukkit.Material
 import org.bukkit.inventory.Inventory
 import org.bukkit.inventory.InventoryHolder
-import org.bukkit.inventory.ItemStack
 
 class TrashInventory : InventoryHolder {
     companion object {
diff --git a/src/main/java/com/github/mori01231/lifecore/block/CustomBlock.kt b/src/main/java/com/github/mori01231/lifecore/block/CustomBlock.kt
index eb8dd7d..897823b 100644
--- a/src/main/java/com/github/mori01231/lifecore/block/CustomBlock.kt
+++ b/src/main/java/com/github/mori01231/lifecore/block/CustomBlock.kt
@@ -4,9 +4,10 @@ import com.github.mori01231.lifecore.util.AxisX
 import kotlinx.serialization.encodeToString
 import kotlinx.serialization.json.Json
 import kotlinx.serialization.json.JsonElement
-import net.minecraft.server.v1_15_R1.NBTTagCompound
+import net.kyori.adventure.text.Component
+import net.minecraft.nbt.CompoundTag
 import org.bukkit.Material
-import org.bukkit.craftbukkit.v1_15_R1.inventory.CraftItemStack
+import org.bukkit.craftbukkit.v1_20_R2.inventory.CraftItemStack
 import org.bukkit.event.Listener
 import org.bukkit.event.block.BlockPlaceEvent
 import org.bukkit.event.player.PlayerInteractEvent
@@ -44,7 +45,7 @@ abstract class CustomBlock(
 
     open fun onPlace(e: BlockPlaceEvent): CustomBlockState {
         val nms = CraftItemStack.asNMSCopy(e.itemInHand)
-        val tagString = if (nms.hasTag() && nms.tag!!.hasKey("BlockState")) {
+        val tagString = if (nms.hasTag() && nms.tag!!.contains("BlockState")) {
             nms.tag!!.getCompound("BlockState").getString("tag")
         } else {
             ""
@@ -63,14 +64,16 @@ abstract class CustomBlock(
         val item = ItemStack(material)
         item.itemMeta = item.itemMeta?.apply {
             setCustomModelData(this@CustomBlock.customModelData)
-            setDisplayName(this@CustomBlock.displayName)
+            if (this@CustomBlock.displayName != null) {
+                displayName(Component.text(this@CustomBlock.displayName))
+            }
             lore = this@CustomBlock.lore
         }
         val nms = CraftItemStack.asNMSCopy(item)
-        nms.orCreateTag.set("BlockState", NBTTagCompound().apply {
-            setString("blockName", this@CustomBlock.name)
+        nms.orCreateTag.put("BlockState", CompoundTag().apply {
+            putString("blockName", this@CustomBlock.name)
             if (state != null) {
-                setString("tag", Json.encodeToString(state.tag))
+                putString("tag", Json.encodeToString(state.tag))
             }
         })
         return CraftItemStack.asCraftMirror(nms)
diff --git a/src/main/java/com/github/mori01231/lifecore/command/LifeCoreUtilCommand.kt b/src/main/java/com/github/mori01231/lifecore/command/LifeCoreUtilCommand.kt
index db8ae35..9a4c38c 100644
--- a/src/main/java/com/github/mori01231/lifecore/command/LifeCoreUtilCommand.kt
+++ b/src/main/java/com/github/mori01231/lifecore/command/LifeCoreUtilCommand.kt
@@ -6,19 +6,21 @@ import com.github.mori01231.lifecore.util.EncodeUtil
 import com.github.mori01231.lifecore.util.ItemUtil
 import com.github.mori01231.lifecore.util.MapUtil
 import com.github.mori01231.lifecore.util.MapUtil.getCanvases
-import net.minecraft.server.v1_15_R1.MojangsonParser
-import net.minecraft.server.v1_15_R1.NBTTagByteArray
-import net.minecraft.server.v1_15_R1.NBTTagCompound
+import net.kyori.adventure.text.Component
+import net.kyori.adventure.text.format.NamedTextColor
+import net.minecraft.nbt.ByteArrayTag
+import net.minecraft.nbt.CompoundTag
+import net.minecraft.nbt.TagParser
 import org.bukkit.Bukkit
 import org.bukkit.ChatColor
 import org.bukkit.command.Command
 import org.bukkit.command.CommandSender
 import org.bukkit.command.TabExecutor
-import org.bukkit.craftbukkit.v1_15_R1.CraftServer
-import org.bukkit.craftbukkit.v1_15_R1.entity.CraftPlayer
-import org.bukkit.craftbukkit.v1_15_R1.inventory.CraftItemStack
-import org.bukkit.craftbukkit.v1_15_R1.map.CraftMapRenderer
-import org.bukkit.craftbukkit.v1_15_R1.map.CraftMapView
+import org.bukkit.craftbukkit.v1_20_R2.CraftServer
+import org.bukkit.craftbukkit.v1_20_R2.entity.CraftPlayer
+import org.bukkit.craftbukkit.v1_20_R2.inventory.CraftItemStack
+import org.bukkit.craftbukkit.v1_20_R2.map.CraftMapRenderer
+import org.bukkit.craftbukkit.v1_20_R2.map.CraftMapView
 import org.bukkit.entity.Player
 import org.bukkit.inventory.meta.MapMeta
 import org.bukkit.util.Vector
@@ -207,7 +209,7 @@ class LifeCoreUtilCommand(val plugin: LifeCore) : TabExecutor {
         GetTag {
             override fun execute(plugin: LifeCore, player: CommandSender, args: Array<String>) {
                 var tag = CraftItemStack.asNMSCopy((player as Player).inventory.itemInMainHand).tag ?: run {
-                    player.sendMessage("${ChatColor.RED}Item has no tag.")
+                    player.sendMessage(Component.text("Item has no tag.", NamedTextColor.RED))
                     return
                 }
                 if (args.isEmpty()) {
@@ -231,31 +233,31 @@ class LifeCoreUtilCommand(val plugin: LifeCore) : TabExecutor {
                     return
                 }
                 val item = CraftItemStack.asNMSCopy((player as Player).inventory.itemInMainHand)
-                val tag = item.tag ?: NBTTagCompound()
-                tag.a(MojangsonParser.parse(args.joinToString(" ")))
-                (player as Player).inventory.setItemInMainHand(CraftItemStack.asBukkitCopy(item))
+                val tag = item.tag ?: CompoundTag()
+                tag.merge(TagParser.parseTag(args.joinToString(" ")))
+                player.inventory.setItemInMainHand(CraftItemStack.asBukkitCopy(item))
             }
         },
         SetTag {
             override fun execute(plugin: LifeCore, player: CommandSender, args: Array<String>) {
                 if (args.isEmpty()) {
-                    player.sendMessage("${ChatColor.RED}Usage: /lifecoreutil $commandName <value>")
+                    player.sendMessage(Component.text("Usage: /lifecoreutil $commandName <value>", NamedTextColor.RED))
                     return
                 }
                 val item = CraftItemStack.asNMSCopy((player as Player).inventory.itemInMainHand)
-                item.tag = MojangsonParser.parse(args.joinToString(" "))
-                (player as Player).inventory.setItemInMainHand(CraftItemStack.asBukkitCopy(item))
+                item.tag = TagParser.parseTag(args.joinToString(" "))
+                player.inventory.setItemInMainHand(CraftItemStack.asBukkitCopy(item))
             }
         },
         GetBlock {
             override fun execute(plugin: LifeCore, player: CommandSender, args: Array<String>) {
                 if (args.isEmpty()) {
-                    player.sendMessage("${ChatColor.RED}ブロック名を指定してください。")
+                    player.sendMessage(Component.text("ブロック名を指定してください。", NamedTextColor.RED))
                     return
                 }
                 val block = plugin.customBlockManager.findBlockByName(args[0])
                 if (block == null) {
-                    player.sendMessage("${ChatColor.RED}ブロックが見つかりませんでした。")
+                    player.sendMessage(Component.text("ブロックが見つかりませんでした。", NamedTextColor.RED))
                     return
                 }
                 (player as Player).inventory.addItem(block.getItemStack(null))
@@ -429,7 +431,7 @@ class LifeCoreUtilCommand(val plugin: LifeCore) : TabExecutor {
                 player.inventory.setItemInMainHand(ItemUtil.setTag(
                     player.inventory.itemInMainHand,
                     "SerializedMapData",
-                    NBTTagByteArray(EncodeUtil.encodeBase64AndGzip(data.toByteArray()))
+                    ByteArrayTag(EncodeUtil.encodeBase64AndGzip(data.toByteArray()))
                 ))
             }
         },
diff --git a/src/main/java/com/github/mori01231/lifecore/data/DataLoader.kt b/src/main/java/com/github/mori01231/lifecore/data/DataLoader.kt
index f51613e..c710054 100644
--- a/src/main/java/com/github/mori01231/lifecore/data/DataLoader.kt
+++ b/src/main/java/com/github/mori01231/lifecore/data/DataLoader.kt
@@ -2,9 +2,9 @@ package com.github.mori01231.lifecore.data
 
 import kotlinx.serialization.Serializable
 import kotlinx.serialization.json.Json
-import org.slf4j.Logger
 import java.nio.file.Files
 import java.nio.file.Path
+import java.util.logging.Logger
 import kotlin.io.path.isDirectory
 import kotlin.io.path.readText
 import kotlin.io.path.relativeTo
diff --git a/src/main/java/com/github/mori01231/lifecore/event/AsyncPlayerPreInteractEntityEvent.java b/src/main/java/com/github/mori01231/lifecore/event/AsyncPlayerPreInteractEntityEvent.java
index bea4733..2509486 100644
--- a/src/main/java/com/github/mori01231/lifecore/event/AsyncPlayerPreInteractEntityEvent.java
+++ b/src/main/java/com/github/mori01231/lifecore/event/AsyncPlayerPreInteractEntityEvent.java
@@ -1,40 +1,42 @@
 package com.github.mori01231.lifecore.event;
 
-import net.minecraft.server.v1_15_R1.Entity;
-import net.minecraft.server.v1_15_R1.PacketPlayInUseEntity;
+import net.minecraft.world.entity.Entity;
+import org.bukkit.craftbukkit.v1_20_R2.CraftWorld;
 import org.bukkit.entity.Player;
 import org.bukkit.event.Cancellable;
 import org.bukkit.event.HandlerList;
-import org.bukkit.event.player.PlayerEvent;
 import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
 
+import java.util.Objects;
 import java.util.UUID;
 
-public class AsyncPlayerPreInteractEntityEvent extends PlayerEvent implements Cancellable {
+public class AsyncPlayerPreInteractEntityEvent extends CallableEvent implements Cancellable {
     private static final HandlerList HANDLER_LIST = new HandlerList();
-    private final PacketPlayInUseEntity.EnumEntityUseAction action;
-    private final Entity interactedEntity;
+    private final Player player;
+    private final int interactedEntity;
     private boolean cancelled = false;
 
-    public AsyncPlayerPreInteractEntityEvent(@NotNull Player player, @NotNull PacketPlayInUseEntity.EnumEntityUseAction action, @NotNull Entity interactedEntity) {
-        super(player, true);
-        this.action = action;
+    public AsyncPlayerPreInteractEntityEvent(@NotNull Player player, int interactedEntity) {
+        super(true);
+        this.player = player;
         this.interactedEntity = interactedEntity;
     }
 
-    @NotNull
-    public PacketPlayInUseEntity.EnumEntityUseAction getAction() {
-        return action;
+    public @NotNull Player getPlayer() {
+        return player;
     }
 
-    @NotNull
-    public Entity getInteractedEntity() {
+    public int getInteractedEntityId() {
         return interactedEntity;
     }
 
-    @NotNull
-    public UUID getEntityUniqueID() {
-        return interactedEntity.getUniqueID();
+    public @NotNull Entity getInteractedEntity() {
+        return Objects.requireNonNull(((CraftWorld) player.getWorld()).getHandle().getEntity(interactedEntity), "entity no longer exists or never existed");
+    }
+
+    public @Nullable UUID getEntityUniqueID() {
+        return getInteractedEntity().getBukkitEntity().getUniqueId();
     }
 
     @Override
diff --git a/src/main/java/com/github/mori01231/lifecore/event/AsyncPlayerPreInteractEvent.java b/src/main/java/com/github/mori01231/lifecore/event/AsyncPlayerPreInteractEvent.java
index 36f0ca8..d77d3a2 100644
--- a/src/main/java/com/github/mori01231/lifecore/event/AsyncPlayerPreInteractEvent.java
+++ b/src/main/java/com/github/mori01231/lifecore/event/AsyncPlayerPreInteractEvent.java
@@ -1,36 +1,32 @@
 package com.github.mori01231.lifecore.event;
 
-import net.minecraft.server.v1_15_R1.Entity;
-import net.minecraft.server.v1_15_R1.PacketPlayInUseEntity;
 import org.bukkit.entity.Player;
 import org.bukkit.event.Cancellable;
 import org.bukkit.event.HandlerList;
-import org.bukkit.event.player.PlayerEvent;
 import org.jetbrains.annotations.NotNull;
 
 /**
  * @deprecated misspelled
  */
 @Deprecated
-public class AsyncPlayerPreInteractEvent extends PlayerEvent implements Cancellable {
+public class AsyncPlayerPreInteractEvent extends CallableEvent implements Cancellable {
     private static final HandlerList HANDLER_LIST = new HandlerList();
-    private final PacketPlayInUseEntity.EnumEntityUseAction action;
-    private final Entity interactedEntity;
+    private final Player player;
+    private final int interactedEntity;
     private boolean cancelled = false;
 
-    public AsyncPlayerPreInteractEvent(@NotNull Player player, @NotNull PacketPlayInUseEntity.EnumEntityUseAction action, @NotNull Entity interactedEntity) {
-        super(player, true);
-        this.action = action;
+    public AsyncPlayerPreInteractEvent(@NotNull Player player, int interactedEntity) {
+        super(true);
+        this.player = player;
         this.interactedEntity = interactedEntity;
     }
 
     @NotNull
-    public PacketPlayInUseEntity.EnumEntityUseAction getAction() {
-        return action;
+    public Player getPlayer() {
+        return player;
     }
 
-    @NotNull
-    public Entity getInteractedEntity() {
+    public int getInteractedEntity() {
         return interactedEntity;
     }
 
diff --git a/src/main/java/com/github/mori01231/lifecore/event/AsyncPreSignChangeEvent.kt b/src/main/java/com/github/mori01231/lifecore/event/AsyncPreSignChangeEvent.kt
index 57803c3..5a933c7 100644
--- a/src/main/java/com/github/mori01231/lifecore/event/AsyncPreSignChangeEvent.kt
+++ b/src/main/java/com/github/mori01231/lifecore/event/AsyncPreSignChangeEvent.kt
@@ -1,6 +1,5 @@
 package com.github.mori01231.lifecore.event
 
-import net.minecraft.server.v1_15_R1.BlockPosition
 import org.bukkit.Location
 import org.bukkit.entity.Player
 import org.bukkit.event.Cancellable
@@ -17,7 +16,7 @@ data class AsyncPreSignChangeEvent(
     val player: Player,
     val pos: Location,
     val lines: List<String>,
-) : Event(true), Cancellable {
+) : CallableEvent(true), Cancellable {
     private var cancelled = false
 
     override fun getHandlers() = handlerList
diff --git a/src/main/java/com/github/mori01231/lifecore/event/CallableEvent.java b/src/main/java/com/github/mori01231/lifecore/event/CallableEvent.java
new file mode 100644
index 0000000..35bbca8
--- /dev/null
+++ b/src/main/java/com/github/mori01231/lifecore/event/CallableEvent.java
@@ -0,0 +1,24 @@
+package com.github.mori01231.lifecore.event;
+
+import org.bukkit.Bukkit;
+import org.bukkit.event.Cancellable;
+import org.bukkit.event.Event;
+
+public abstract class CallableEvent extends Event {
+    public CallableEvent(boolean async) {
+        super(async);
+    }
+
+    public CallableEvent() {
+        this(false);
+    }
+
+    /**
+     * Call the event. If the event is cancellable and is cancelled, it will return true. Otherwise, it will return false.
+     * @return true if the event is cancelled, false otherwise
+     */
+    public boolean callEvent() {
+        Bukkit.getPluginManager().callEvent(this);
+        return this instanceof Cancellable && ((Cancellable) this).isCancelled();
+    }
+}
diff --git a/src/main/java/com/github/mori01231/lifecore/listener/CancelPetClickListener.java b/src/main/java/com/github/mori01231/lifecore/listener/CancelPetClickListener.java
index 883fef1..6a80442 100644
--- a/src/main/java/com/github/mori01231/lifecore/listener/CancelPetClickListener.java
+++ b/src/main/java/com/github/mori01231/lifecore/listener/CancelPetClickListener.java
@@ -22,8 +22,8 @@ public void onClickEntity(AsyncPlayerPreInteractEntityEvent e) {
             if (!opt.isPresent()) {
                 continue;
             }
-            if (opt.get().getUniqueId().equals(e.getInteractedEntity().getUniqueID()) ||
-                    opt.get().getHandle().getUniqueID().equals(e.getInteractedEntity().getUniqueID())) {
+            if (opt.get().getUniqueId().equals(e.getEntityUniqueID()) ||
+                    opt.get().getHandle().getUniqueID().equals(e.getEntityUniqueID())) {
                 matched = true;
                 break;
             }
diff --git a/src/main/java/com/github/mori01231/lifecore/listener/CustomBlockListener.kt b/src/main/java/com/github/mori01231/lifecore/listener/CustomBlockListener.kt
index 0a17726..4b3a809 100644
--- a/src/main/java/com/github/mori01231/lifecore/listener/CustomBlockListener.kt
+++ b/src/main/java/com/github/mori01231/lifecore/listener/CustomBlockListener.kt
@@ -1,11 +1,12 @@
 package com.github.mori01231.lifecore.listener
 
 import com.github.mori01231.lifecore.LifeCore
+import net.kyori.adventure.text.Component
 import org.bukkit.GameMode
 import org.bukkit.Location
 import org.bukkit.Material
 import org.bukkit.Sound
-import org.bukkit.craftbukkit.v1_15_R1.inventory.CraftItemStack
+import org.bukkit.craftbukkit.v1_20_R2.inventory.CraftItemStack
 import org.bukkit.entity.Arrow
 import org.bukkit.entity.Player
 import org.bukkit.event.EventHandler
@@ -30,7 +31,7 @@ class CustomBlockListener(val plugin: LifeCore) : Listener {
             destroyAt(e.player, e.clickedBlock!!.location)
         } else {
             if (!e.player.hasPermission("lifecore.customblock.interact.${state.blockName}")) {
-                e.player.sendActionBar("このブロックを使用する権限がありません。")
+                e.player.sendActionBar(Component.text("このブロックを使用する権限がありません。"))
                 return
             }
             state.getBlock().handleInteract(e, state)
@@ -43,14 +44,14 @@ class CustomBlockListener(val plugin: LifeCore) : Listener {
         if (!nms.hasTag()) {
             return
         }
-        if (!nms.tag!!.hasKey("BlockState")) {
+        if (!nms.tag!!.contains("BlockState")) {
             return
         }
         val blockState = nms.tag!!.getCompound("BlockState")
         val blockName = blockState.getString("blockName")
         val block = plugin.customBlockManager.findBlockByName(blockName) ?: return
         if (!e.player.hasPermission("lifecore.customblock.place.$blockName")) {
-            e.player.sendActionBar("このブロックを設置する権限がありません。")
+            e.player.sendActionBar(Component.text("このブロックを設置する権限がありません。"))
             return
         }
         val state = block.onPlace(e)
@@ -63,7 +64,7 @@ class CustomBlockListener(val plugin: LifeCore) : Listener {
         val state = plugin.customBlockManager.getState(e.block.location) ?: return
         e.isCancelled = true
         if (!e.player.hasPermission("lifecore.customblock.destroy.${state.blockName}")) {
-            e.player.sendActionBar("このブロックを破壊する権限がありません。")
+            e.player.sendActionBar(Component.text("このブロックを破壊する権限がありません。"))
             return
         }
         if (e.player.gameMode != GameMode.CREATIVE && !state.getBlock().canDestroy(state, false)) {
@@ -131,7 +132,7 @@ class CustomBlockListener(val plugin: LifeCore) : Listener {
         }
         if (!state.getBlock().canDestroy(state, true)) return
         if (!player.hasPermission("lifecore.customblock.destroy.${state.blockName}")) {
-            player.sendActionBar("このブロックを破壊する権限がありません。")
+            player.sendActionBar(Component.text("このブロックを破壊する権限がありません。"))
             return
         }
         val drop = state.getBlock().preDestroy(state)
diff --git a/src/main/java/com/github/mori01231/lifecore/listener/DropProtectListener.java b/src/main/java/com/github/mori01231/lifecore/listener/DropProtectListener.java
index e281db1..4dba6a8 100644
--- a/src/main/java/com/github/mori01231/lifecore/listener/DropProtectListener.java
+++ b/src/main/java/com/github/mori01231/lifecore/listener/DropProtectListener.java
@@ -5,11 +5,11 @@
 import net.azisaba.rarity.api.Rarity;
 import net.azisaba.rarity.api.RarityAPI;
 import net.azisaba.rarity.api.RarityAPIProvider;
-import net.minecraft.server.v1_15_R1.DataWatcherObject;
-import net.minecraft.server.v1_15_R1.EntityItem;
-import net.minecraft.server.v1_15_R1.Items;
+import net.minecraft.network.syncher.EntityDataAccessor;
+import net.minecraft.world.entity.item.ItemEntity;
+import net.minecraft.world.item.Items;
 import org.bukkit.ChatColor;
-import org.bukkit.craftbukkit.v1_15_R1.entity.CraftItem;
+import org.bukkit.craftbukkit.v1_20_R2.entity.CraftItem;
 import org.bukkit.event.EventHandler;
 import org.bukkit.event.Listener;
 import org.bukkit.event.player.PlayerDropItemEvent;
@@ -47,17 +47,17 @@ public void onDrop(PlayerDropItemEvent e) {
 
             // set item to air via reflection and data watcher
             e.getItemDrop().remove();
-            EntityItem entityItem = (EntityItem) ((CraftItem) e.getItemDrop()).getHandle();
-            DataWatcherObject<net.minecraft.server.v1_15_R1.ItemStack> itemStackDataWatcherObject;
+            ItemEntity entityItem = (ItemEntity) ((CraftItem) e.getItemDrop()).getHandle();
+            EntityDataAccessor<net.minecraft.world.item.ItemStack> itemStackDataWatcherObject;
             try {
-                Field f = EntityItem.class.getDeclaredField("ITEM");
+                Field f = ItemEntity.class.getDeclaredField("DATA_ITEM");
                 f.setAccessible(true);
-                itemStackDataWatcherObject = (DataWatcherObject<net.minecraft.server.v1_15_R1.ItemStack>) f.get(null);
+                itemStackDataWatcherObject = (EntityDataAccessor<net.minecraft.world.item.ItemStack>) f.get(null);
             } catch (ReflectiveOperationException ex) {
                 return;
             }
-            entityItem.getDataWatcher().set(itemStackDataWatcherObject, new net.minecraft.server.v1_15_R1.ItemStack(Items.AIR));
-            entityItem.getDataWatcher().markDirty(itemStackDataWatcherObject);
+            entityItem.getEntityData().set(itemStackDataWatcherObject, new net.minecraft.world.item.ItemStack(Items.AIR));
+            entityItem.getEntityData().markDirty(itemStackDataWatcherObject);
 
             e.getPlayer().sendMessage(ChatColor.RED + "このレア度のアイテムはドロップできません。");
             e.getPlayer().sendMessage(ChatColor.AQUA + "/dropprotect" + ChatColor.GOLD + "で設定を変更できます。");
diff --git a/src/main/java/com/github/mori01231/lifecore/listener/EscapeLobbyListener.kt b/src/main/java/com/github/mori01231/lifecore/listener/EscapeLobbyListener.kt
index 5b62075..032e6be 100644
--- a/src/main/java/com/github/mori01231/lifecore/listener/EscapeLobbyListener.kt
+++ b/src/main/java/com/github/mori01231/lifecore/listener/EscapeLobbyListener.kt
@@ -38,8 +38,9 @@ class EscapeLobbyListener(private val plugin: LifeCore) : Listener {
         if (e.player.hasPermission("lifecore.lobby-bypass")) return
         val lobby = plugin.lifeCoreConfig.lobbyRegion
         if (lobby.isIncomplete()) return
-        if (e.to.world.name != lobby?.world) return
-        if (lobby.contains(e.to)) return
+        val to = e.to ?: return
+        if (to.world!!.name != lobby?.world) return
+        if (lobby.contains(to)) return
         e.isCancelled = true
     }
 }
diff --git a/src/main/java/com/github/mori01231/lifecore/listener/TrashListener.kt b/src/main/java/com/github/mori01231/lifecore/listener/TrashListener.kt
index a40e811..3bca806 100644
--- a/src/main/java/com/github/mori01231/lifecore/listener/TrashListener.kt
+++ b/src/main/java/com/github/mori01231/lifecore/listener/TrashListener.kt
@@ -52,6 +52,7 @@ class TrashListener(private val plugin: LifeCore) : Listener {
                 var moneyMultiplier = trashMoneyPerItem
                 val items: MutableList<ItemStack> = ArrayList()
                 for (item in e.inventory.contents) {
+                    item ?: continue
                     try {
                         if (item.amount > 0) {
                             for (line in plugin.config.getStringList("Trash.Items")) {
diff --git a/src/main/java/com/github/mori01231/lifecore/listener/UnableCraftListener.java b/src/main/java/com/github/mori01231/lifecore/listener/UnableCraftListener.java
index 115316f..cbb6d5c 100644
--- a/src/main/java/com/github/mori01231/lifecore/listener/UnableCraftListener.java
+++ b/src/main/java/com/github/mori01231/lifecore/listener/UnableCraftListener.java
@@ -18,8 +18,8 @@ public class UnableCraftListener implements Listener {
     public void onCraft(PrepareGrindstoneEvent e) {
 
         if ( e.getView().getPlayer().hasPermission("lifecore.bypasscraft") ) return;
-        if ( checkItemStack(e.getInventory().getLowerItem()) ) e.setResult(null);
-        if ( checkItemStack(e.getInventory().getUpperItem()) ) e.setResult(null);
+        if ( checkItemStack(e.getInventory().getItem(0)) ) e.setResult(null);
+        if ( checkItemStack(e.getInventory().getItem(1)) ) e.setResult(null);
 
     }
     @EventHandler
@@ -27,8 +27,8 @@ public void onAnvil(PrepareAnvilEvent e) {
 
         if ( e.getView().getPlayer().hasPermission("lifecore.bypasscraft") ) return;
 
-        if ( checkItemStack(e.getInventory().getFirstItem()) ) e.setResult(null);
-        if ( checkItemStack(e.getInventory().getSecondItem()) ) e.setResult(null);
+        if ( checkItemStack(e.getInventory().getItem(0)) ) e.setResult(null);
+        if ( checkItemStack(e.getInventory().getItem(1)) ) e.setResult(null);
 
     }
 
@@ -39,7 +39,7 @@ public static boolean checkItemStack(ItemStack item) {
         ItemMeta meta = item.getItemMeta();
 
         if ( item.getType().isAir() ) return false;
-        if ( !meta.hasDisplayName() ) return false;
+        if ( meta == null || !meta.hasDisplayName() ) return false;
         if ( meta.hasLore() ) return true;
 
         for ( String c: LIST ) {
diff --git a/src/main/java/com/github/mori01231/lifecore/listener/VoidListener.kt b/src/main/java/com/github/mori01231/lifecore/listener/VoidListener.kt
index cae4ee4..9a4dede 100644
--- a/src/main/java/com/github/mori01231/lifecore/listener/VoidListener.kt
+++ b/src/main/java/com/github/mori01231/lifecore/listener/VoidListener.kt
@@ -9,7 +9,7 @@ import org.bukkit.event.player.PlayerMoveEvent
 object VoidListener : Listener {
     @EventHandler
     fun onPlayerMove(e: PlayerMoveEvent) {
-        if ((e.player.gameMode == GameMode.SURVIVAL || e.player.gameMode == GameMode.ADVENTURE) && e.to.y < 0) {
+        if ((e.player.gameMode == GameMode.SURVIVAL || e.player.gameMode == GameMode.ADVENTURE) && e.from.y < 0) {
             e.player.lastDamageCause = EntityDamageEvent(e.player, EntityDamageEvent.DamageCause.VOID, 99999999.0)
             e.player.damage(99999999.0)
             e.player.health = 0.0
diff --git a/src/main/java/com/github/mori01231/lifecore/listener/VoteListener.java b/src/main/java/com/github/mori01231/lifecore/listener/VoteListener.java
index 6e2391b..d36c07e 100644
--- a/src/main/java/com/github/mori01231/lifecore/listener/VoteListener.java
+++ b/src/main/java/com/github/mori01231/lifecore/listener/VoteListener.java
@@ -15,11 +15,11 @@
 
 public class VoteListener implements Listener {
     private final LifeCore plugin;
-    
+
     public VoteListener(@NotNull LifeCore plugin) {
         this.plugin = plugin;
     }
-    
+
     @EventHandler
     public void onVote(@NotNull VotifierEvent e) {
         processVotePacket(plugin, e.getVote().getUsername(), e.getVote().getServiceName());
@@ -33,11 +33,11 @@ public static synchronized void processVotePacket(@NotNull LifeCore plugin, @Not
         if (player == null) {
             PlayerUtil.resolveUUIDAsync(plugin, username).thenAcceptAsync(uuid -> {
                 if (uuid == null) {
-                    plugin.getSLF4JLogger().warn("Could not resolve UUID for player " + username);
+                    plugin.getLogger().warning("Could not resolve UUID for player " + username);
                     return;
                 }
                 VotesFile.increase(uuid.toString());
-                plugin.getSLF4JLogger().info("Queued vote from {} (UUID: {}, service name: {})", username, uuid, serviceName);
+                plugin.getLogger().info("Queued vote from " + username + " (UUID: " + uuid + ", service name: " + serviceName + ")");
             }, plugin.asyncExecutor);
             return;
         }
diff --git a/src/main/java/com/github/mori01231/lifecore/listener/item/PicksawItemListener.kt b/src/main/java/com/github/mori01231/lifecore/listener/item/PicksawItemListener.kt
index 161e0cd..489b8ab 100644
--- a/src/main/java/com/github/mori01231/lifecore/listener/item/PicksawItemListener.kt
+++ b/src/main/java/com/github/mori01231/lifecore/listener/item/PicksawItemListener.kt
@@ -3,7 +3,7 @@ package com.github.mori01231.lifecore.listener.item
 import com.github.mori01231.lifecore.data.DataLoader
 import com.github.mori01231.lifecore.util.ItemUtil
 import org.bukkit.Material
-import org.bukkit.craftbukkit.v1_15_R1.block.data.CraftBlockData
+import org.bukkit.craftbukkit.v1_20_R2.block.data.CraftBlockData
 import org.bukkit.event.EventHandler
 import org.bukkit.event.Listener
 import org.bukkit.event.block.Action
@@ -21,7 +21,7 @@ class PicksawItemListener(private val dataLoader: DataLoader) : Listener {
         if (e.action != Action.LEFT_CLICK_BLOCK) return
         val item = e.player.inventory.itemInMainHand
         if (ItemUtil.getStringTag(item, "LifeItemId") != ITEM_ID) return
-        val minecraftName = "minecraft:" + ((e.clickedBlock ?: return).blockData as CraftBlockData).state.block.item.toString()
+        val minecraftName = "minecraft:" + ((e.clickedBlock ?: return).blockData as CraftBlockData).state.block.asItem().toString()
         if (dataLoader.findTag("minecraft:mineable/axe")?.resolve()?.contains(minecraftName) == true) {
             item.type = Material.valueOf(item.type.name.substring(0, item.type.name.lastIndexOf('_')) + "_AXE")
             e.player.inventory.setItemInMainHand(item)
@@ -36,4 +36,4 @@ class PicksawItemListener(private val dataLoader: DataLoader) : Listener {
             e.player.inventory.setItemInMainHand(item)
         }
     }
-}
\ No newline at end of file
+}
diff --git a/src/main/java/com/github/mori01231/lifecore/map/SerializedMapCanvas.kt b/src/main/java/com/github/mori01231/lifecore/map/SerializedMapCanvas.kt
index 57b5d5c..e7a3cb5 100644
--- a/src/main/java/com/github/mori01231/lifecore/map/SerializedMapCanvas.kt
+++ b/src/main/java/com/github/mori01231/lifecore/map/SerializedMapCanvas.kt
@@ -1,7 +1,7 @@
 package com.github.mori01231.lifecore.map
 
 import kotlinx.serialization.Serializable
-import org.bukkit.craftbukkit.v1_15_R1.map.CraftMapCanvas
+import org.bukkit.craftbukkit.v1_20_R2.map.CraftMapCanvas
 
 @Serializable
 data class SerializedMapCanvas(val buffer: ByteArray, val base: ByteArray) {
@@ -43,4 +43,4 @@ data class SerializedMapCanvas(val buffer: ByteArray, val base: ByteArray) {
         result = 31 * result + base.contentHashCode()
         return result
     }
-}
\ No newline at end of file
+}
diff --git a/src/main/java/com/github/mori01231/lifecore/map/SerializedMapDataRenderer.kt b/src/main/java/com/github/mori01231/lifecore/map/SerializedMapDataRenderer.kt
index c7b18ec..5bf47fb 100644
--- a/src/main/java/com/github/mori01231/lifecore/map/SerializedMapDataRenderer.kt
+++ b/src/main/java/com/github/mori01231/lifecore/map/SerializedMapDataRenderer.kt
@@ -1,8 +1,8 @@
 package com.github.mori01231.lifecore.map
 
-import net.minecraft.server.v1_15_R1.WorldMap
-import org.bukkit.craftbukkit.v1_15_R1.map.CraftMapCanvas
-import org.bukkit.craftbukkit.v1_15_R1.map.CraftMapView
+import net.minecraft.world.level.saveddata.maps.MapItemSavedData
+import org.bukkit.craftbukkit.v1_20_R2.map.CraftMapCanvas
+import org.bukkit.craftbukkit.v1_20_R2.map.CraftMapView
 import org.bukkit.entity.Player
 import org.bukkit.map.MapCanvas
 import org.bukkit.map.MapRenderer
@@ -17,13 +17,15 @@ class SerializedMapDataRenderer(private val canvas: SerializedMapCanvas) : MapRe
         for (i in 0 until canvas.cursors.size()) {
             canvas.cursors.removeCursor(canvas.cursors.getCursor(i))
         }
-        val worldMap = CraftMapView::class.java.getDeclaredField("worldMap").apply { isAccessible = true }[view] as WorldMap
+        val worldMap = CraftMapView::class.java.getDeclaredField("worldMap").apply { isAccessible = true }[view] as MapItemSavedData
+        worldMap.decorations.clear()
+        worldMap.setDecorationsDirty()
         for (x in 0..127) {
             for (y in 0..127) {
-                worldMap.decorations.clear()
-                worldMap.flagDirty(x, y)
+                worldMap.setColorsDirty(x, y)
             }
         }
+        worldMap.setDirty()
         init = true
     }
-}
\ No newline at end of file
+}
diff --git a/src/main/java/com/github/mori01231/lifecore/network/PacketHandler.java b/src/main/java/com/github/mori01231/lifecore/network/PacketHandler.java
index a7aa2be..ae0c057 100644
--- a/src/main/java/com/github/mori01231/lifecore/network/PacketHandler.java
+++ b/src/main/java/com/github/mori01231/lifecore/network/PacketHandler.java
@@ -5,13 +5,12 @@
 import com.github.mori01231.lifecore.event.AsyncPreSignChangeEvent;
 import io.netty.channel.ChannelDuplexHandler;
 import io.netty.channel.ChannelHandlerContext;
-import net.minecraft.server.v1_15_R1.Entity;
-import net.minecraft.server.v1_15_R1.EntityPlayer;
-import net.minecraft.server.v1_15_R1.PacketPlayInUpdateSign;
-import net.minecraft.server.v1_15_R1.PacketPlayInUseEntity;
+import net.minecraft.network.protocol.game.ServerboundInteractPacket;
+import net.minecraft.network.protocol.game.ServerboundSignUpdatePacket;
+import net.minecraft.server.level.ServerPlayer;
 import org.bukkit.Bukkit;
 import org.bukkit.Location;
-import org.bukkit.craftbukkit.v1_15_R1.entity.CraftPlayer;
+import org.bukkit.craftbukkit.v1_20_R2.entity.CraftPlayer;
 import org.bukkit.entity.Player;
 import org.jetbrains.annotations.NotNull;
 
@@ -20,7 +19,7 @@
 
 public class PacketHandler extends ChannelDuplexHandler {
     private final Player player;
-    private final EntityPlayer entityPlayer;
+    private final ServerPlayer entityPlayer;
 
     public PacketHandler(@NotNull Player player) {
         this.player = player;
@@ -29,22 +28,20 @@ public PacketHandler(@NotNull Player player) {
 
     @Override
     public void channelRead(ChannelHandlerContext ctx, Object msg) throws Exception {
-        if (msg instanceof PacketPlayInUseEntity) {
-            PacketPlayInUseEntity packet = (PacketPlayInUseEntity) msg;
-            Entity entity = packet.a(entityPlayer.world);
-            if (entity != null) {
-                if (new AsyncPlayerPreInteractEvent(player, packet.b(), entity).callEvent() &&
-                        new AsyncPlayerPreInteractEntityEvent(player, packet.b(), entity).callEvent()) {
-                    super.channelRead(ctx, msg);
-                }
-                return;
+        if (msg instanceof ServerboundInteractPacket packet) {
+            int entityId = packet.getEntityId();
+            if (new AsyncPlayerPreInteractEvent(player, entityId).callEvent() &&
+                    new AsyncPlayerPreInteractEntityEvent(player, entityId).callEvent()) {
+                super.channelRead(ctx, msg);
             }
         }
-        if (msg instanceof PacketPlayInUpdateSign) {
-            PacketPlayInUpdateSign packet = (PacketPlayInUpdateSign) msg;
-            Location location = new Location(player.getWorld(), packet.b().getX(), packet.b().getY(), packet.b().getZ());
-            List<String> lines = Arrays.asList(packet.c());
-            if (new AsyncPreSignChangeEvent(player, location, lines).callEvent()) {
+        if (msg instanceof ServerboundSignUpdatePacket packet) {
+            var pos = packet.getPos();
+            var location = new Location(player.getWorld(), pos.getX(), pos.getY(), pos.getZ());
+            var lines = Arrays.asList(packet.getLines());
+            var event = new AsyncPreSignChangeEvent(player, location, lines);
+            Bukkit.getPluginManager().callEvent(event);
+            if (!event.isCancelled()) {
                 super.channelRead(ctx, msg);
             }
             return;
diff --git a/src/main/java/com/github/mori01231/lifecore/region/CuboidRegion.kt b/src/main/java/com/github/mori01231/lifecore/region/CuboidRegion.kt
index 4252581..ecfbfef 100644
--- a/src/main/java/com/github/mori01231/lifecore/region/CuboidRegion.kt
+++ b/src/main/java/com/github/mori01231/lifecore/region/CuboidRegion.kt
@@ -63,7 +63,7 @@ data class CuboidRegion(
         if (pos2 == null) {
             error("This CuboidRegion is incomplete (pos2 is null)")
         }
-        if (location.world.name != world) {
+        if (location.world?.name != world) {
             return false
         }
         return contains(location.blockX, location.blockY, location.blockZ)
diff --git a/src/main/java/com/github/mori01231/lifecore/region/WorldLocation.kt b/src/main/java/com/github/mori01231/lifecore/region/WorldLocation.kt
index 7edcfd3..eb36289 100644
--- a/src/main/java/com/github/mori01231/lifecore/region/WorldLocation.kt
+++ b/src/main/java/com/github/mori01231/lifecore/region/WorldLocation.kt
@@ -12,7 +12,7 @@ data class WorldLocation(
     val z: Int,
 ) {
     constructor(location: Location) : this(
-        location.world.name,
+        location.world?.name ?: error("World is null"),
         location.blockX,
         location.blockY,
         location.blockZ,
diff --git a/src/main/java/com/github/mori01231/lifecore/util/ItemUtil.java b/src/main/java/com/github/mori01231/lifecore/util/ItemUtil.java
index cd6af3d..cbd2d82 100644
--- a/src/main/java/com/github/mori01231/lifecore/util/ItemUtil.java
+++ b/src/main/java/com/github/mori01231/lifecore/util/ItemUtil.java
@@ -1,11 +1,11 @@
 package com.github.mori01231.lifecore.util;
 
 import net.azisaba.itemstash.ItemStash;
-import net.minecraft.server.v1_15_R1.NBTBase;
-import net.minecraft.server.v1_15_R1.NBTTagCompound;
+import net.minecraft.nbt.CompoundTag;
+import net.minecraft.nbt.Tag;
 import org.bukkit.Material;
 import org.bukkit.attribute.Attribute;
-import org.bukkit.craftbukkit.v1_15_R1.inventory.CraftItemStack;
+import org.bukkit.craftbukkit.v1_20_R2.inventory.CraftItemStack;
 import org.bukkit.entity.Player;
 import org.bukkit.inventory.EquipmentSlot;
 import org.bukkit.inventory.ItemStack;
@@ -37,17 +37,17 @@ public static boolean isProbablyAdminSword(@Nullable ItemStack stack) {
     @Contract("null -> null")
     public static @Nullable String getMythicType(@Nullable ItemStack stack) {
         if (stack == null || stack.getType().isAir()) return null;
-        NBTTagCompound tag = CraftItemStack.asNMSCopy(stack).getTag();
+        CompoundTag tag = CraftItemStack.asNMSCopy(stack).getTag();
         if (tag == null) return null;
         String type = tag.getString("MYTHIC_TYPE");
-        if (type == null || type.isEmpty()) return null;
+        if (type.isEmpty()) return null;
         return type;
     }
 
     @Contract("null, _ -> null")
     public static @Nullable String getStringTag(@Nullable ItemStack stack, @NotNull String key) {
         if (stack == null || stack.getType().isAir()) return null;
-        NBTTagCompound tag = CraftItemStack.asNMSCopy(stack).getTag();
+        CompoundTag tag = CraftItemStack.asNMSCopy(stack).getTag();
         if (tag == null) return null;
         return tag.getString(key);
     }
@@ -55,24 +55,24 @@ public static boolean isProbablyAdminSword(@Nullable ItemStack stack) {
     @Contract("null, _ -> null")
     public static @Nullable byte[] getByteArrayTag(@Nullable ItemStack stack, @NotNull String key) {
         if (stack == null || stack.getType().isAir()) return null;
-        NBTTagCompound tag = CraftItemStack.asNMSCopy(stack).getTag();
+        CompoundTag tag = CraftItemStack.asNMSCopy(stack).getTag();
         if (tag == null) return null;
         return tag.getByteArray(key);
     }
 
     public static @NotNull ItemStack setStringTag(@Nullable ItemStack stack, @NotNull String key, @NotNull String value) {
         if (stack == null || stack.getType().isAir()) return new ItemStack(Material.AIR);
-        net.minecraft.server.v1_15_R1.ItemStack nms = CraftItemStack.asNMSCopy(stack);
-        NBTTagCompound tag = nms.getOrCreateTag();
-        tag.setString(key, value);
+        net.minecraft.world.item.ItemStack nms = CraftItemStack.asNMSCopy(stack);
+        CompoundTag tag = nms.getOrCreateTag();
+        tag.putString(key, value);
         return CraftItemStack.asBukkitCopy(nms);
     }
 
-    public static @NotNull ItemStack setTag(@Nullable ItemStack stack, @NotNull String key, @NotNull NBTBase nbt) {
+    public static @NotNull ItemStack setTag(@Nullable ItemStack stack, @NotNull String key, @NotNull Tag nbt) {
         if (stack == null || stack.getType().isAir()) return new ItemStack(Material.AIR);
-        net.minecraft.server.v1_15_R1.ItemStack nms = CraftItemStack.asNMSCopy(stack);
-        NBTTagCompound tag = nms.getOrCreateTag();
-        tag.set(key, nbt);
+        net.minecraft.world.item.ItemStack nms = CraftItemStack.asNMSCopy(stack);
+        CompoundTag tag = nms.getOrCreateTag();
+        tag.put(key, nbt);
         return CraftItemStack.asBukkitCopy(nms);
     }
 
diff --git a/src/main/java/com/github/mori01231/lifecore/util/MapUtil.kt b/src/main/java/com/github/mori01231/lifecore/util/MapUtil.kt
index 909fd38..5ebdf0c 100644
--- a/src/main/java/com/github/mori01231/lifecore/util/MapUtil.kt
+++ b/src/main/java/com/github/mori01231/lifecore/util/MapUtil.kt
@@ -8,10 +8,10 @@ import kotlinx.serialization.json.JsonElement
 import kotlinx.serialization.json.decodeFromJsonElement
 import kotlinx.serialization.json.encodeToJsonElement
 import org.bukkit.Material
-import org.bukkit.craftbukkit.v1_15_R1.entity.CraftPlayer
-import org.bukkit.craftbukkit.v1_15_R1.map.CraftMapCanvas
-import org.bukkit.craftbukkit.v1_15_R1.map.CraftMapRenderer
-import org.bukkit.craftbukkit.v1_15_R1.map.CraftMapView
+import org.bukkit.craftbukkit.v1_20_R2.entity.CraftPlayer
+import org.bukkit.craftbukkit.v1_20_R2.map.CraftMapCanvas
+import org.bukkit.craftbukkit.v1_20_R2.map.CraftMapRenderer
+import org.bukkit.craftbukkit.v1_20_R2.map.CraftMapView
 import org.bukkit.entity.Player
 import org.bukkit.inventory.ItemStack
 import org.bukkit.inventory.meta.MapMeta
diff --git a/src/main/java/com/github/mori01231/lifecore/util/PlayerUtil.java b/src/main/java/com/github/mori01231/lifecore/util/PlayerUtil.java
index 0b9822e..520c61e 100644
--- a/src/main/java/com/github/mori01231/lifecore/util/PlayerUtil.java
+++ b/src/main/java/com/github/mori01231/lifecore/util/PlayerUtil.java
@@ -6,7 +6,7 @@
 import com.github.mori01231.lifecore.TableKey;
 import io.netty.channel.Channel;
 import org.bukkit.Bukkit;
-import org.bukkit.craftbukkit.v1_15_R1.entity.CraftPlayer;
+import org.bukkit.craftbukkit.v1_20_R2.entity.CraftPlayer;
 import org.bukkit.entity.Player;
 import org.jetbrains.annotations.Contract;
 import org.jetbrains.annotations.NotNull;
@@ -72,6 +72,6 @@ public static UUID fetchUUID(@NotNull DatabaseConfig databaseConfig, @NotNull St
     @NotNull
     public static Channel getChannel(@NotNull Player player) {
         // channel field is set to non-null value after #channelActive is called
-        return Objects.requireNonNull(((CraftPlayer) player).getHandle().playerConnection.networkManager.channel, "inactive channel");
+        return Objects.requireNonNull(((CraftPlayer) player).getHandle().connection.connection.channel, "inactive channel");
     }
 }
diff --git a/src/main/java/com/github/mori01231/lifecore/util/PromptSign.kt b/src/main/java/com/github/mori01231/lifecore/util/PromptSign.kt
index 4363548..7619e5f 100644
--- a/src/main/java/com/github/mori01231/lifecore/util/PromptSign.kt
+++ b/src/main/java/com/github/mori01231/lifecore/util/PromptSign.kt
@@ -1,12 +1,11 @@
 package com.github.mori01231.lifecore.util
 
 import com.github.mori01231.lifecore.LifeCore
-import net.minecraft.server.v1_15_R1.BlockPosition
-import net.minecraft.server.v1_15_R1.CancelledPacketHandleException
-import net.minecraft.server.v1_15_R1.PacketPlayOutOpenSignEditor
+import net.minecraft.core.BlockPos
+import net.minecraft.network.protocol.game.ClientboundOpenSignEditorPacket
 import org.bukkit.Bukkit
 import org.bukkit.Material
-import org.bukkit.craftbukkit.v1_15_R1.entity.CraftPlayer
+import org.bukkit.craftbukkit.v1_20_R2.entity.CraftPlayer
 import org.bukkit.entity.Player
 import org.bukkit.plugin.java.JavaPlugin
 import java.util.*
@@ -27,8 +26,8 @@ object PromptSign {
                 player.sendBlockChange(loc0, origBlockData)
                 action.accept(it)
             }
-            (player as CraftPlayer).handle.playerConnection
-                .sendPacket(PacketPlayOutOpenSignEditor(BlockPosition(loc0.blockX, loc0.blockY, loc0.blockZ)))
+            (player as CraftPlayer).handle.connection
+                .send(ClientboundOpenSignEditorPacket(BlockPos(loc0.blockX, loc0.blockY, loc0.blockZ), true))
         })
     }
-}
\ No newline at end of file
+}