diff --git a/.github/workflows/buildtools.sh b/.github/workflows/buildtools.sh
index c5da7e3..29a1243 100644
--- a/.github/workflows/buildtools.sh
+++ b/.github/workflows/buildtools.sh
@@ -36,4 +36,5 @@ checkVersion "1.21" "21"
 checkVersion "1.21.3" "21"
 checkVersion "1.21.4" "21"
 checkVersion "1.21.5" "21"
-checkVersion "1.21.6" "21"
\ No newline at end of file
+checkVersion "1.21.6" "21"
+checkVersion "1.21.9" "21"
\ No newline at end of file
diff --git a/zip-common/src/main/java/net/imprex/zip/common/MinecraftVersion.java b/zip-common/src/main/java/net/imprex/zip/common/MinecraftVersion.java
index 408c70f..590d089 100644
--- a/zip-common/src/main/java/net/imprex/zip/common/MinecraftVersion.java
+++ b/zip-common/src/main/java/net/imprex/zip/common/MinecraftVersion.java
@@ -18,6 +18,7 @@ private static final class NmsMapping {
 		private static final List<NmsMapping> MAPPINGS = new ArrayList<>();
 
 		static {
+			MAPPINGS.add(new NmsMapping("1.21.9", "v1_21_R6"));
 			MAPPINGS.add(new NmsMapping("1.21.6", "v1_21_R5"));
 			MAPPINGS.add(new NmsMapping("1.21.5", "v1_21_R4"));
 			MAPPINGS.add(new NmsMapping("1.21.4", "v1_21_R3"));
diff --git a/zip-nms/pom.xml b/zip-nms/pom.xml
index a064cdc..896168c 100644
--- a/zip-nms/pom.xml
+++ b/zip-nms/pom.xml
@@ -24,5 +24,6 @@
 		<module>zip-nms-v1_21_R3</module>
 		<module>zip-nms-v1_21_R4</module>
 		<module>zip-nms-v1_21_R5</module>
+		<module>zip-nms-v1_21_R6</module>
 	</modules>
 </project>
\ No newline at end of file
diff --git a/zip-nms/zip-nms-v1_21_R6/pom.xml b/zip-nms/zip-nms-v1_21_R6/pom.xml
new file mode 100644
index 0000000..65d0555
--- /dev/null
+++ b/zip-nms/zip-nms-v1_21_R6/pom.xml
@@ -0,0 +1,70 @@
+<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
+  <modelVersion>4.0.0</modelVersion>
+
+	<parent>
+		<groupId>net.imprex</groupId>
+		<artifactId>zip-nms</artifactId>
+		<version>${revision}</version>
+	</parent>
+
+	<artifactId>zip-nms-v1_21_R6</artifactId>
+
+	<dependencies>
+		<dependency>
+			<groupId>net.imprex</groupId>
+			<artifactId>zip-nms-api</artifactId>
+			<version>${revision}</version>
+			<scope>provided</scope>
+		</dependency>
+		<dependency>
+			<groupId>org.spigotmc</groupId>
+			<artifactId>spigot</artifactId>
+			<version>1.21.9-R0.1-SNAPSHOT</version>
+			<classifier>remapped-mojang</classifier>
+			<scope>provided</scope>
+		</dependency>
+	</dependencies>
+
+	<build>
+		<plugins>
+			<plugin>
+				<groupId>net.md-5</groupId>
+				<artifactId>specialsource-maven-plugin</artifactId>
+				<version>${plugin.specialsource.version}</version>
+				<executions>
+					<execution>
+						<phase>package</phase>
+						<goals>
+							<goal>remap</goal>
+						</goals>
+						<id>remap-obf</id>
+						<configuration>
+							<srgIn>
+								org.spigotmc:minecraft-server:1.21.9-R0.1-SNAPSHOT:txt:maps-mojang</srgIn>
+							<reverse>true</reverse>
+							<remappedDependencies>
+								org.spigotmc:spigot:1.21.9-R0.1-SNAPSHOT:jar:remapped-mojang</remappedDependencies>
+							<remappedArtifactAttached>true</remappedArtifactAttached>
+							<remappedClassifierName>remapped-obf</remappedClassifierName>
+						</configuration>
+					</execution>
+					<execution>
+						<phase>package</phase>
+						<goals>
+							<goal>remap</goal>
+						</goals>
+						<id>remap-spigot</id>
+						<configuration>
+							<inputFile>
+								${project.build.directory}/${project.artifactId}-${project.version}-remapped-obf.jar</inputFile>
+							<srgIn>
+								org.spigotmc:minecraft-server:1.21.9-R0.1-SNAPSHOT:csrg:maps-spigot</srgIn>
+							<remappedDependencies>
+								org.spigotmc:spigot:1.21.9-R0.1-SNAPSHOT:jar:remapped-obf</remappedDependencies>
+						</configuration>
+					</execution>
+				</executions>
+			</plugin>
+		</plugins>
+	</build>
+</project>
\ No newline at end of file
diff --git a/zip-nms/zip-nms-v1_21_R6/src/main/java/net/imprex/zip/nms/v1_21_R6/ZipNmsManager.java b/zip-nms/zip-nms-v1_21_R6/src/main/java/net/imprex/zip/nms/v1_21_R6/ZipNmsManager.java
new file mode 100644
index 0000000..be7f15f
--- /dev/null
+++ b/zip-nms/zip-nms-v1_21_R6/src/main/java/net/imprex/zip/nms/v1_21_R6/ZipNmsManager.java
@@ -0,0 +1,214 @@
+package net.imprex.zip.nms.v1_21_R6;
+
+import java.io.ByteArrayInputStream;
+import java.io.IOException;
+import java.lang.reflect.InvocationTargetException;
+import java.lang.reflect.Method;
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.List;
+import java.util.UUID;
+import java.util.function.BiConsumer;
+
+import org.bukkit.Material;
+import org.bukkit.craftbukkit.v1_21_R6.inventory.CraftItemStack;
+import org.bukkit.inventory.ItemStack;
+import org.bukkit.inventory.meta.SkullMeta;
+
+import com.google.common.collect.Multimaps;
+import com.google.gson.JsonArray;
+import com.google.gson.JsonElement;
+import com.google.gson.JsonObject;
+import com.mojang.authlib.GameProfile;
+import com.mojang.authlib.properties.Property;
+import com.mojang.authlib.properties.PropertyMap;
+import com.mojang.serialization.DataResult;
+import com.mojang.serialization.Dynamic;
+import com.mojang.serialization.DynamicOps;
+import com.mojang.serialization.JsonOps;
+
+import net.imprex.zip.common.BPConstants;
+import net.imprex.zip.common.ReflectionUtil;
+import net.imprex.zip.nms.api.ItemStackContainerResult;
+import net.imprex.zip.nms.api.ItemStackWithSlot;
+import net.imprex.zip.nms.api.NmsManager;
+import net.minecraft.SharedConstants;
+import net.minecraft.core.RegistryAccess;
+import net.minecraft.nbt.CompoundTag;
+import net.minecraft.nbt.ListTag;
+import net.minecraft.nbt.NbtAccounter;
+import net.minecraft.nbt.NbtIo;
+import net.minecraft.nbt.NbtOps;
+import net.minecraft.nbt.Tag;
+import net.minecraft.server.MinecraftServer;
+import net.minecraft.util.datafix.DataFixers;
+import net.minecraft.util.datafix.fixes.References;
+import net.minecraft.world.item.component.ResolvableProfile;
+
+public class ZipNmsManager implements NmsManager {
+
+	private static final int DATA_VERSION = SharedConstants.getCurrentVersion().dataVersion().version();
+
+	@SuppressWarnings("deprecation")
+	private static final RegistryAccess DEFAULT_REGISTRY = MinecraftServer.getServer().registryAccess();
+
+	private static final DynamicOps<Tag> DYNAMIC_OPS_NBT = DEFAULT_REGISTRY.createSerializationContext(NbtOps.INSTANCE);
+	private static final DynamicOps<JsonElement> DYNAMIC_OPS_JSON = DEFAULT_REGISTRY.createSerializationContext(JsonOps.INSTANCE);
+	
+	private static final BiConsumer<SkullMeta, GameProfile> SET_PROFILE;
+
+	static {
+		BiConsumer<SkullMeta, GameProfile> setProfile = (meta, profile) -> {
+			throw new NullPointerException("Unable to find 'setProfile' method!");
+		};
+
+		Class<?> craftMetaSkullClass = new ItemStack(Material.PLAYER_HEAD)
+				.getItemMeta()
+				.getClass();
+
+		Method setResolvableProfileMethod = ReflectionUtil.searchMethod(craftMetaSkullClass, void.class, ResolvableProfile.class);
+		if (setResolvableProfileMethod != null) {
+			setProfile = (meta, profile) -> {
+				try {
+					setResolvableProfileMethod.invoke(meta, ResolvableProfile.createResolved(profile));
+				} catch (IllegalAccessException | InvocationTargetException e) {
+					e.printStackTrace();
+				}
+			};
+		} else {
+			Method setProfileMethod = ReflectionUtil.searchMethod(craftMetaSkullClass, void.class, GameProfile.class);
+			if (setProfileMethod != null) {
+				setProfile = (meta, profile) -> {
+					try {
+						setProfileMethod.invoke(meta, profile);
+					} catch (IllegalAccessException | InvocationTargetException e) {
+						e.printStackTrace();
+					}
+				};
+			}
+		}
+
+		SET_PROFILE = setProfile;
+	}
+
+	@Override
+	public JsonObject itemstackToJsonElement(ItemStack[] items) {
+		JsonArray jsonItems = new JsonArray();
+		for (int slot = 0; slot < items.length; slot++) {
+			ItemStack item = items[slot];
+			if (item == null || item.getType() == Material.AIR) {
+				continue;
+			}
+			net.minecraft.world.item.ItemStack minecraftItem = CraftItemStack.asNMSCopy(item);
+			
+			DataResult<JsonElement> result = net.minecraft.world.item.ItemStack.CODEC.encodeStart(DYNAMIC_OPS_JSON, minecraftItem);
+			JsonObject resultJson = result.getOrThrow().getAsJsonObject();
+			
+			resultJson.addProperty(BPConstants.KEY_INVENTORY_SLOT, slot);
+			jsonItems.add(resultJson);
+		}
+		
+		JsonObject outputJson = new JsonObject();
+		outputJson.addProperty(BPConstants.KEY_INVENTORY_VERSION, BPConstants.INVENTORY_VERSION);
+		outputJson.addProperty(BPConstants.KEY_INVENTORY_DATA_VERSION, DATA_VERSION);
+		outputJson.addProperty(BPConstants.KEY_INVENTORY_ITEMS_SIZE, items.length);
+		outputJson.add(BPConstants.KEY_INVENTORY_ITEMS, jsonItems);
+		return outputJson;
+	}
+
+	@Override
+	public ItemStackContainerResult jsonElementToItemStack(JsonObject json) {
+		// check if current version the same
+		if (json.get(BPConstants.KEY_INVENTORY_VERSION).getAsInt() != BPConstants.INVENTORY_VERSION) {
+			throw new IllegalStateException("Unable to convert binary to itemstack because zip version is missmatching");
+		}
+		
+		int dataVersion = json.get(BPConstants.KEY_INVENTORY_DATA_VERSION).getAsInt();
+		int itemsSize = json.get(BPConstants.KEY_INVENTORY_ITEMS_SIZE).getAsInt();
+		
+		List<ItemStackWithSlot> items = new ArrayList<>();
+		
+		JsonArray jsonItems = json.get(BPConstants.KEY_INVENTORY_ITEMS).getAsJsonArray();
+		for (JsonElement item : jsonItems) {
+			Dynamic<JsonElement> dynamicItem = new Dynamic<>(JsonOps.INSTANCE, item);
+			Dynamic<JsonElement> dynamicItemFixed = DataFixers.getDataFixer()
+					.update(References.ITEM_STACK, dynamicItem, dataVersion, DATA_VERSION);
+			
+			net.minecraft.world.item.ItemStack minecraftItem = net.minecraft.world.item.ItemStack.CODEC
+					.parse(DYNAMIC_OPS_JSON, dynamicItemFixed.getValue())
+					.getOrThrow();
+			
+			ItemStack bukkitItem = CraftItemStack.asCraftMirror(minecraftItem);
+			int slot = item.getAsJsonObject().get(BPConstants.KEY_INVENTORY_SLOT).getAsInt();
+			
+			items.add(new ItemStackWithSlot(slot, bukkitItem));
+		}
+		
+		return new ItemStackContainerResult(itemsSize, items);
+	}
+	
+	@Override
+	public JsonObject migrateToJsonElement(byte[] binary) {
+		CompoundTag compound;
+		try (ByteArrayInputStream inputStream = new ByteArrayInputStream(binary)) {
+			compound = NbtIo.readCompressed(inputStream, NbtAccounter.unlimitedHeap());
+		} catch (IOException e) {
+			throw new IllegalStateException("Unable to parse binary to nbt", e);
+		}
+		
+		ListTag list = compound.getListOrEmpty("i");
+
+		int currentSlot = 0;
+		
+		JsonArray jsonItems = new JsonArray();
+		for (Tag base : list) {
+			if (base instanceof CompoundTag itemTag) {
+				String itemType = itemTag.getString("id").orElse("");
+				if (itemType.equals("minecraft:air")) {
+					currentSlot++;
+					continue;
+				}
+				
+				Dynamic<Tag> dynamicItem = new Dynamic<>(NbtOps.INSTANCE, itemTag);
+				net.minecraft.world.item.ItemStack minecraftItem = net.minecraft.world.item.ItemStack.CODEC
+						.parse(DYNAMIC_OPS_NBT, dynamicItem.getValue())
+						.getOrThrow();
+				
+				DataResult<JsonElement> result = net.minecraft.world.item.ItemStack.CODEC.encodeStart(DYNAMIC_OPS_JSON, minecraftItem);
+				JsonObject resultJson = result.getOrThrow().getAsJsonObject();
+				
+				resultJson.addProperty(BPConstants.KEY_INVENTORY_SLOT, currentSlot);
+				jsonItems.add(resultJson);
+				
+				currentSlot++;
+			}
+		}
+		
+		JsonObject json = new JsonObject();
+		json.addProperty(BPConstants.KEY_INVENTORY_VERSION, BPConstants.INVENTORY_VERSION);
+		json.addProperty(BPConstants.KEY_INVENTORY_DATA_VERSION, DATA_VERSION);
+		json.addProperty(BPConstants.KEY_INVENTORY_ITEMS_SIZE, list.size());
+		json.add(BPConstants.KEY_INVENTORY_ITEMS, jsonItems);
+		return json;
+	}
+
+	@Override
+	public void setSkullProfile(SkullMeta meta, String texture) {
+		try {
+			HashMap<String, Property> properties = new HashMap<>();
+			properties.put("textures", new Property("textures", texture));
+			
+			PropertyMap propertyMap = new PropertyMap(Multimaps.forMap(properties));
+			GameProfile gameProfile = new GameProfile(UUID.randomUUID(), "", propertyMap);
+
+			SET_PROFILE.accept(meta, gameProfile);
+		} catch (Exception e) {
+			e.printStackTrace();
+		}
+	}
+
+	@Override
+	public boolean isAir(Material material) {
+		return material == null || material == Material.AIR;
+	}
+}
\ No newline at end of file
diff --git a/zip-plugin/pom.xml b/zip-plugin/pom.xml
index 7aa6882..cd7515d 100644
--- a/zip-plugin/pom.xml
+++ b/zip-plugin/pom.xml
@@ -119,5 +119,11 @@
 			<version>${revision}</version>
 			<scope>compile</scope>
 		</dependency>
+		<dependency>
+			<groupId>net.imprex</groupId>
+			<artifactId>zip-nms-v1_21_R6</artifactId>
+			<version>${revision}</version>
+			<scope>compile</scope>
+		</dependency>
 	</dependencies>
 </project>
\ No newline at end of file