diff --git a/bukkit/src/main/java/net/momirealms/craftengine/bukkit/item/BukkitItemManager.java b/bukkit/src/main/java/net/momirealms/craftengine/bukkit/item/BukkitItemManager.java
index 20c326586..601609099 100644
--- a/bukkit/src/main/java/net/momirealms/craftengine/bukkit/item/BukkitItemManager.java
+++ b/bukkit/src/main/java/net/momirealms/craftengine/bukkit/item/BukkitItemManager.java
@@ -1,5 +1,6 @@
 package net.momirealms.craftengine.bukkit.item;
 
+import com.saicone.rtag.item.ItemTagStream;
 import net.momirealms.craftengine.bukkit.item.behavior.BucketItemBehavior;
 import net.momirealms.craftengine.bukkit.item.behavior.FlintAndSteelItemBehavior;
 import net.momirealms.craftengine.bukkit.item.behavior.WaterBucketItemBehavior;
@@ -138,7 +139,10 @@ public class BukkitItemManager extends AbstractItemManager<ItemStack> {
 
     @Override
     public Item<ItemStack> fromByteArray(byte[] bytes) {
-        return this.factory.wrap(ItemStack.deserializeBytes(bytes));
+        if (VersionHelper.isOrAbove1_21_6()) {
+            return this.factory.wrap(ItemStack.deserializeBytes(bytes));
+        }
+        return this.factory.wrap(ItemTagStream.INSTANCE.fromBytes(bytes));
     }
 
     @Override
diff --git a/bukkit/src/main/java/net/momirealms/craftengine/bukkit/item/factory/BukkitItemFactory.java b/bukkit/src/main/java/net/momirealms/craftengine/bukkit/item/factory/BukkitItemFactory.java
index 5cf774fd7..3dcff2fc1 100644
--- a/bukkit/src/main/java/net/momirealms/craftengine/bukkit/item/factory/BukkitItemFactory.java
+++ b/bukkit/src/main/java/net/momirealms/craftengine/bukkit/item/factory/BukkitItemFactory.java
@@ -1,6 +1,7 @@
 package net.momirealms.craftengine.bukkit.item.factory;
 
 import com.google.gson.JsonElement;
+import com.saicone.rtag.item.ItemTagStream;
 import net.momirealms.craftengine.bukkit.plugin.reflection.minecraft.CoreReflections;
 import net.momirealms.craftengine.bukkit.util.ItemTags;
 import net.momirealms.craftengine.core.item.ItemFactory;
@@ -9,6 +10,7 @@ import net.momirealms.craftengine.core.item.JukeboxPlayable;
 import net.momirealms.craftengine.core.item.setting.EquipmentData;
 import net.momirealms.craftengine.core.plugin.CraftEngine;
 import net.momirealms.craftengine.core.util.Key;
+import net.momirealms.craftengine.core.util.VersionHelper;
 import net.momirealms.sparrow.nbt.Tag;
 import org.bukkit.inventory.ItemStack;
 
@@ -48,7 +50,10 @@ public abstract class BukkitItemFactory<W extends ItemWrapper<ItemStack>> extend
 
     @Override
     protected byte[] toByteArray(W item) {
-        return item.getItem().serializeAsBytes();
+        if (VersionHelper.isOrAbove1_21_6()) {
+            return item.getItem().serializeAsBytes();
+        }
+        return ItemTagStream.INSTANCE.toBytes(item.getItem());
     }
 
     @Override