diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index d00a0d5..a2159d4 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -12,7 +12,7 @@ jobs:
       matrix:
         # Use these Java versions
         java: [
-          17,    # Current Java LTS & minimum supported by Minecraft
+          21,    # Current Java LTS & minimum supported by Minecraft
         ]
         # and run on both Linux and Windows
         os: [ubuntu-20.04]
diff --git a/build.gradle b/build.gradle
index 69c49c7..76b12db 100644
--- a/build.gradle
+++ b/build.gradle
@@ -1,11 +1,11 @@
 plugins {
-	id 'fabric-loom' version '1.5-SNAPSHOT'
+	id 'fabric-loom' version '1.6-SNAPSHOT'
 	id 'maven-publish'
 	id 'idea'
 }
 
-sourceCompatibility = JavaVersion.VERSION_17
-targetCompatibility = JavaVersion.VERSION_17
+sourceCompatibility = JavaVersion.VERSION_21
+targetCompatibility = JavaVersion.VERSION_21
 
 archivesBaseName = project.archives_base_name
 version = project.mod_version + "+" + project.minecraft_version
@@ -45,7 +45,7 @@ processResources {
 
 tasks.withType(JavaCompile).configureEach {
 	// Minecraft 1.18 (1.18-pre2) upwards uses Java 17.
-	it.options.release = 17
+	it.options.release = 21
 }
 
 java {
diff --git a/gradle.properties b/gradle.properties
index 5bca209..1c08289 100644
--- a/gradle.properties
+++ b/gradle.properties
@@ -1,17 +1,17 @@
 # Done to increase the memory available to gradle.
-org.gradle.jvmargs=-Xmx1G
+org.gradle.jvmargs=-Xmx2G
 
 # Fabric Properties
 	# check these on https://fabricmc.net/develop
-	minecraft_version=1.20.4
-	yarn_mappings=1.20.4+build.3
-	loader_version=0.15.3
+	minecraft_version=1.20.5
+	yarn_mappings=1.20.5+build.1
+	loader_version=0.15.10
 
 # Mod Properties
-	mod_version = 1.6.2
+	mod_version = 1.7.0
 	maven_group = com.campersamu
 	archives_base_name = itemcommander
 
 # Dependencies
-	fabric_version=0.91.3+1.20.4
-	placeholder_version=2.3.0+1.20.3
+	fabric_version=0.97.8+1.20.5
+	placeholder_version=2.4.0-pre.1+1.20.5
diff --git a/gradle/wrapper/gradle-wrapper.properties b/gradle/wrapper/gradle-wrapper.properties
index a595206..48c0a02 100644
--- a/gradle/wrapper/gradle-wrapper.properties
+++ b/gradle/wrapper/gradle-wrapper.properties
@@ -1,5 +1,5 @@
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-8.5-bin.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-8.7-bin.zip
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
diff --git a/src/main/java/com/campersamu/itemcommander/ItemCommanderInit.java b/src/main/java/com/campersamu/itemcommander/ItemCommanderInit.java
index a42049f..b8420de 100644
--- a/src/main/java/com/campersamu/itemcommander/ItemCommanderInit.java
+++ b/src/main/java/com/campersamu/itemcommander/ItemCommanderInit.java
@@ -27,7 +27,7 @@ public void onInitialize() {
         GiveCommanderCommand.init();
         //endregion
         LOGGER.info(">item commander loading");
-        LOGGER.info(">placeholder-api support: " + (PLACEHOLDERS_LOADED ? "enabled" : "disabled"));
+        LOGGER.info(">placeholder-api support: {}", PLACEHOLDERS_LOADED ? "enabled" : "disabled");
         LOGGER.info(">when a stick is more powerful than you");
     }
 }
diff --git a/src/main/java/com/campersamu/itemcommander/command/AppendCommanderCommand.java b/src/main/java/com/campersamu/itemcommander/command/AppendCommanderCommand.java
index 610eae8..0cff58b 100644
--- a/src/main/java/com/campersamu/itemcommander/command/AppendCommanderCommand.java
+++ b/src/main/java/com/campersamu/itemcommander/command/AppendCommanderCommand.java
@@ -5,6 +5,9 @@
 import com.mojang.brigadier.context.CommandContext;
 import com.mojang.brigadier.exceptions.CommandSyntaxException;
 import net.fabricmc.fabric.api.command.v2.CommandRegistrationCallback;
+import net.minecraft.component.DataComponentTypes;
+import net.minecraft.component.type.NbtComponent;
+import net.minecraft.nbt.NbtCompound;
 import net.minecraft.server.command.ServerCommandSource;
 import net.minecraft.text.Text;
 import net.minecraft.util.Formatting;
@@ -49,8 +52,8 @@ private static int execute(final @NotNull CommandContext<ServerCommandSource> co
         }
 
         try {
-            final Commander commander = Commander.fromNbt(player.getMainHandStack().getOrCreateNbt()).appendCommand(command);
-            player.getMainHandStack().getOrCreateNbt()
+            final Commander commander = Commander.fromNbt(player.getMainHandStack().getOrDefault(DataComponentTypes.CUSTOM_DATA, NbtComponent.of(new NbtCompound())).getNbt()).appendCommand(command);
+            player.getMainHandStack().getOrDefault(DataComponentTypes.CUSTOM_DATA, NbtComponent.of(new NbtCompound())).getNbt()
                     .put(COMMANDER_TAG_KEY, commander.toNbt());
         } catch (CommanderException e) {
             ctxSource.sendError(errorNotCommanderItemText);
diff --git a/src/main/java/com/campersamu/itemcommander/command/CreateCommanderCommand.java b/src/main/java/com/campersamu/itemcommander/command/CreateCommanderCommand.java
index 015fb68..0b0feee 100644
--- a/src/main/java/com/campersamu/itemcommander/command/CreateCommanderCommand.java
+++ b/src/main/java/com/campersamu/itemcommander/command/CreateCommanderCommand.java
@@ -7,7 +7,10 @@
 import com.mojang.brigadier.exceptions.CommandSyntaxException;
 import net.fabricmc.fabric.api.command.v2.CommandRegistrationCallback;
 import net.minecraft.command.argument.ItemStackArgument;
+import net.minecraft.component.DataComponentTypes;
+import net.minecraft.component.type.NbtComponent;
 import net.minecraft.item.ItemStack;
+import net.minecraft.nbt.NbtCompound;
 import net.minecraft.server.command.ServerCommandSource;
 import net.minecraft.text.Text;
 import net.minecraft.util.Formatting;
@@ -98,11 +101,11 @@ private static int execute(final @NotNull CommandContext<ServerCommandSource> co
                 ctxSource.sendError(errorNoItemInHandText);
                 return -1;
             }
-            player.getMainHandStack().getOrCreateNbt()
+            player.getMainHandStack().getOrDefault(DataComponentTypes.CUSTOM_DATA, NbtComponent.of(new NbtCompound())).getNbt()
                     .put(COMMANDER_TAG_KEY, commander.toNbt());
         } else {
             final ItemStack stack = stackArg.createStack(1, true);
-            stack.getOrCreateNbt().put(COMMANDER_TAG_KEY, commander.toNbt());
+            stack.getOrDefault(DataComponentTypes.CUSTOM_DATA, NbtComponent.of(new NbtCompound())).getNbt().put(COMMANDER_TAG_KEY, commander.toNbt());
             player.giveItemStack(stack);
         }
 
diff --git a/src/main/java/com/campersamu/itemcommander/command/GiveCommanderCommand.java b/src/main/java/com/campersamu/itemcommander/command/GiveCommanderCommand.java
index 99ec3d4..210e35e 100644
--- a/src/main/java/com/campersamu/itemcommander/command/GiveCommanderCommand.java
+++ b/src/main/java/com/campersamu/itemcommander/command/GiveCommanderCommand.java
@@ -76,7 +76,7 @@ private static int execute(final @NotNull CommandContext<ServerCommandSource> co
             players.forEach(player -> player.giveItemStack(stack));
         } catch (IOException e) {
             ctxSource.sendFeedback(() -> errorText(fileName), true);
-            LOGGER.error("Failed to load item from file " + fileName, e);
+            LOGGER.error("Failed to load item from file {}", fileName, e);
             return -1;
         }
 
diff --git a/src/main/java/com/campersamu/itemcommander/config/CommanderIO.java b/src/main/java/com/campersamu/itemcommander/config/CommanderIO.java
index a84efbb..59ad49f 100644
--- a/src/main/java/com/campersamu/itemcommander/config/CommanderIO.java
+++ b/src/main/java/com/campersamu/itemcommander/config/CommanderIO.java
@@ -1,15 +1,18 @@
 package com.campersamu.itemcommander.config;
 
+import com.mojang.datafixers.DataFixerUpper;
 import net.fabricmc.loader.api.FabricLoader;
 import net.minecraft.item.ItemStack;
 import net.minecraft.nbt.NbtCompound;
 import net.minecraft.nbt.NbtIo;
+import net.minecraft.server.MinecraftServer;
 import org.jetbrains.annotations.NotNull;
 import org.jetbrains.annotations.Nullable;
 
 import java.io.IOException;
 import java.nio.file.Files;
 import java.nio.file.Path;
+import java.util.Objects;
 import java.util.stream.Stream;
 
 import static com.campersamu.itemcommander.ItemCommanderInit.LOGGER;
@@ -64,7 +67,8 @@ static void saveItemToFile(final @NotNull ItemStack stack, @NotNull String fileN
                 ? fileName
                 : fileName + ".nbt";
         try {
-            NbtIo.write(stack.writeNbt(new NbtCompound()), CONFIG_FOLDER.resolve(fileName));
+            if (!(FabricLoader.getInstance().getGameInstance() instanceof MinecraftServer server)) return;
+            NbtIo.write((NbtCompound) stack.encodeAllowEmpty(server.getRegistryManager()), CONFIG_FOLDER.resolve(fileName));
         } catch (IOException e) {
             LOGGER.error("Failed to save item to file", e);
             throw new RuntimeException(e);
@@ -83,6 +87,8 @@ static ItemStack loadFromFile(@NotNull String fileName) throws IOException {
         fileName = (fileName.contains(".nbt"))
                 ? fileName
                 : fileName + ".nbt";
-        return ItemStack.fromNbt(NbtIo.read(CONFIG_FOLDER.resolve(fileName)));
+        if (!(FabricLoader.getInstance().getGameInstance() instanceof MinecraftServer server)) return ItemStack.EMPTY;
+//        server.getDataFixer().update()
+        return ItemStack.fromNbtOrEmpty(server.getRegistryManager(), Objects.requireNonNull(NbtIo.read(CONFIG_FOLDER.resolve(fileName))));
     }
 }
diff --git a/src/main/java/com/campersamu/itemcommander/exception/CommanderException.java b/src/main/java/com/campersamu/itemcommander/exception/CommanderException.java
index 33305fd..78a5cc9 100644
--- a/src/main/java/com/campersamu/itemcommander/exception/CommanderException.java
+++ b/src/main/java/com/campersamu/itemcommander/exception/CommanderException.java
@@ -1,4 +1,4 @@
 package com.campersamu.itemcommander.exception;
 
-public abstract class CommanderException extends Exception{
+public abstract class CommanderException extends Exception {
 }
diff --git a/src/main/java/com/campersamu/itemcommander/exception/CommanderNoCommandException.java b/src/main/java/com/campersamu/itemcommander/exception/CommanderNoCommandException.java
index 5dd2837..e699900 100644
--- a/src/main/java/com/campersamu/itemcommander/exception/CommanderNoCommandException.java
+++ b/src/main/java/com/campersamu/itemcommander/exception/CommanderNoCommandException.java
@@ -2,9 +2,10 @@
 
 import static com.campersamu.itemcommander.ItemCommanderInit.LOGGER;
 
-public class CommanderNoCommandException extends CommanderException{
+public class CommanderNoCommandException extends CommanderException {
     public static final String error = "No command was specified for Commander item!";
-    public CommanderNoCommandException(){
+
+    public CommanderNoCommandException() {
         super();
         LOGGER.error(error);
     }
diff --git a/src/main/java/com/campersamu/itemcommander/exception/CommanderNoTagException.java b/src/main/java/com/campersamu/itemcommander/exception/CommanderNoTagException.java
index 0dd6b1d..5c918e0 100644
--- a/src/main/java/com/campersamu/itemcommander/exception/CommanderNoTagException.java
+++ b/src/main/java/com/campersamu/itemcommander/exception/CommanderNoTagException.java
@@ -1,7 +1,5 @@
 package com.campersamu.itemcommander.exception;
 
 public class CommanderNoTagException extends CommanderException {
-    public CommanderNoTagException(){
-        super();
-    }
+    public CommanderNoTagException() { super(); }
 }
diff --git a/src/main/java/com/campersamu/itemcommander/mixin/ItemInteractMixin.java b/src/main/java/com/campersamu/itemcommander/mixin/ItemInteractMixin.java
index f4d22ac..6bd6832 100644
--- a/src/main/java/com/campersamu/itemcommander/mixin/ItemInteractMixin.java
+++ b/src/main/java/com/campersamu/itemcommander/mixin/ItemInteractMixin.java
@@ -2,7 +2,10 @@
 
 import com.campersamu.itemcommander.exception.CommanderException;
 import com.campersamu.itemcommander.nbt.Commander;
+import net.minecraft.component.DataComponentTypes;
+import net.minecraft.component.type.NbtComponent;
 import net.minecraft.item.ItemStack;
+import net.minecraft.nbt.NbtCompound;
 import net.minecraft.server.network.ServerPlayerEntity;
 import net.minecraft.server.network.ServerPlayerInteractionManager;
 import net.minecraft.util.ActionResult;
@@ -27,8 +30,8 @@ public class ItemInteractMixin {
     )
     private void checkInteraction(ServerPlayerEntity player, World world, ItemStack stack, Hand hand, CallbackInfoReturnable<ActionResult> cir) {
         try {
-            if (stack.hasNbt()) {
-                cir.setReturnValue(Commander.fromNbt(Objects.requireNonNull(stack.getNbt())).executeCommand(player, stack, player.raycast(4, 1.0F, false).getPos()));
+            if (stack.get(DataComponentTypes.CUSTOM_DATA) != null) {
+                cir.setReturnValue(Commander.fromNbt(Objects.requireNonNull(stack.getOrDefault(DataComponentTypes.CUSTOM_DATA, NbtComponent.of(new NbtCompound())).getNbt())).executeCommand(player, stack, player.raycast(4, 1.0F, false).getPos()));
             }
         } catch (CommanderException ignored) {
         }
diff --git a/src/main/java/com/campersamu/itemcommander/mixin/LecternMixin.java b/src/main/java/com/campersamu/itemcommander/mixin/LecternMixin.java
index e46cedb..ad125d5 100644
--- a/src/main/java/com/campersamu/itemcommander/mixin/LecternMixin.java
+++ b/src/main/java/com/campersamu/itemcommander/mixin/LecternMixin.java
@@ -7,9 +7,12 @@
 import net.minecraft.block.BlockWithEntity;
 import net.minecraft.block.LecternBlock;
 import net.minecraft.block.entity.LecternBlockEntity;
+import net.minecraft.component.DataComponentTypes;
+import net.minecraft.component.type.NbtComponent;
 import net.minecraft.entity.Entity;
 import net.minecraft.entity.player.PlayerEntity;
 import net.minecraft.item.ItemStack;
+import net.minecraft.nbt.NbtCompound;
 import net.minecraft.server.network.ServerPlayerEntity;
 import net.minecraft.state.property.BooleanProperty;
 import net.minecraft.util.ActionResult;
@@ -46,12 +49,12 @@ private LecternMixin(Settings settings) {
             at = @At("HEAD"),
             cancellable = true
     )
-    private void onUseCommand(BlockState state, World world, BlockPos pos, PlayerEntity player, Hand hand, BlockHitResult hit, CallbackInfoReturnable<ActionResult> cir) {
+    private void onUseCommand(BlockState state, World world, BlockPos pos, PlayerEntity player, BlockHitResult hit, CallbackInfoReturnable<ActionResult> cir) {
         if (player instanceof ServerPlayerEntity serverPlayer && state.get(HAS_BOOK))
             try {
                 final LecternBlockEntity lectern = requireNonNullElse((LecternBlockEntity) world.getBlockEntity(pos), new LecternBlockEntity(pos, state));
                 final ItemStack stack = lectern.getBook();
-                final Commander commander = Commander.fromNbt(stack.getOrCreateNbt());
+                final Commander commander = Commander.fromNbt(stack.getOrDefault(DataComponentTypes.CUSTOM_DATA, NbtComponent.of(new NbtCompound())).getNbt());
                 final ActionResult result = commander.executeCommand(serverPlayer, stack);
                 if (commander.action() == CommanderAction.CONSUME) {
                     lectern.setBook(stack.split(1));
diff --git a/src/main/java/com/campersamu/itemcommander/nbt/Commander.java b/src/main/java/com/campersamu/itemcommander/nbt/Commander.java
index 06840f1..0965eaf 100644
--- a/src/main/java/com/campersamu/itemcommander/nbt/Commander.java
+++ b/src/main/java/com/campersamu/itemcommander/nbt/Commander.java
@@ -341,7 +341,7 @@ public static String applyPlaceholdersApiIfPresent(final @NotNull ServerCommandS
 
     public static void executeCommandDangerously(@NotNull MinecraftServer server, @NotNull ServerPlayerEntity player, String command) {
         synchronized (server.getPlayerManager().getOpList()) {
-            var op = server.getPlayerManager().isOperator(player.getGameProfile());
+            final var op = server.getPlayerManager().isOperator(player.getGameProfile());
             if (!op) server.getPlayerManager().addToOperators(player.getGameProfile());
             server.getCommandManager().executeWithPrefix(player.getCommandSource(), command);
             if (!op) server.getPlayerManager().removeFromOperators(player.getGameProfile());