diff --git a/src/main/java/net/minestom/server/instance/block/BlockImpl.java b/src/main/java/net/minestom/server/instance/block/BlockImpl.java
index b20525b02..3281eeaf9 100644
--- a/src/main/java/net/minestom/server/instance/block/BlockImpl.java
+++ b/src/main/java/net/minestom/server/instance/block/BlockImpl.java
@@ -3,9 +3,9 @@ package net.minestom.server.instance.block;
 import com.github.benmanes.caffeine.cache.Cache;
 import com.github.benmanes.caffeine.cache.Caffeine;
 import com.google.gson.JsonObject;
-import it.unimi.dsi.fastutil.objects.ObjectArrayList;
 import net.minestom.server.registry.Registry;
 import net.minestom.server.tag.Tag;
+import net.minestom.server.utils.ObjectArray;
 import net.minestom.server.utils.block.BlockUtils;
 import org.jetbrains.annotations.NotNull;
 import org.jetbrains.annotations.Nullable;
@@ -17,7 +17,7 @@ import java.util.function.Function;
 
 final class BlockImpl implements Block {
     // Block state -> block object
-    private static final ObjectArrayList<Block> BLOCK_STATE_MAP = new ObjectArrayList<>();
+    private static final ObjectArray<Block> BLOCK_STATE_MAP = new ObjectArray<>();
     private static final Registry.Container<Block> CONTAINER = new Registry.Container<>(Registry.Resource.BLOCKS,
             (container, namespace, object) -> {
                 final JsonObject stateObject = object.remove("states").getAsJsonObject();
@@ -30,7 +30,7 @@ final class BlockImpl implements Block {
                     final var propertyMap = BlockUtils.parseProperties(query);
                     final Block block = new BlockImpl(Registry.block(namespace, object, stateOverride),
                             unmodifiableEntries, propertyMap, null, null);
-                    BLOCK_STATE_MAP.add(block.stateId(), block);
+                    BLOCK_STATE_MAP.set(block.stateId(), block);
                     propertyEntry.put(propertyMap, block);
                 }
                 // Register default state
diff --git a/src/main/java/net/minestom/server/registry/Registry.java b/src/main/java/net/minestom/server/registry/Registry.java
index 795d909c6..06676d488 100644
--- a/src/main/java/net/minestom/server/registry/Registry.java
+++ b/src/main/java/net/minestom/server/registry/Registry.java
@@ -4,12 +4,12 @@ import com.google.gson.Gson;
 import com.google.gson.JsonElement;
 import com.google.gson.JsonObject;
 import com.google.gson.stream.JsonReader;
-import it.unimi.dsi.fastutil.objects.ObjectArrayList;
 import net.minestom.server.entity.EntitySpawnType;
 import net.minestom.server.entity.EquipmentSlot;
 import net.minestom.server.instance.block.Block;
 import net.minestom.server.item.Material;
 import net.minestom.server.utils.NamespaceID;
+import net.minestom.server.utils.ObjectArray;
 import net.minestom.server.utils.validate.Check;
 import org.jetbrains.annotations.ApiStatus;
 import org.jetbrains.annotations.NotNull;
@@ -76,7 +76,7 @@ public final class Registry {
         // namespace -> registry data
         private final Map<String, T> namespaceMap = new HashMap<>();
         // id -> registry data
-        private final ObjectArrayList<T> idMap = new ObjectArrayList<>();
+        private final ObjectArray<T> ids = new ObjectArray<>();
         private final Collection<T> objects = Collections.unmodifiableCollection(namespaceMap.values());
 
         private final boolean initialized;
@@ -90,7 +90,7 @@ public final class Registry {
                 loader.accept(this, namespace, object);
             }
             this.initialized = true;
-            this.idMap.trim();
+            this.ids.trim();
         }
 
         public T get(@NotNull String namespace) {
@@ -102,7 +102,7 @@ public final class Registry {
         }
 
         public T getId(int id) {
-            return idMap.get(id);
+            return ids.get(id);
         }
 
         public Collection<T> values() {
@@ -111,7 +111,7 @@ public final class Registry {
 
         public void register(@NotNull T value) {
             Check.stateCondition(initialized, "Registering is only available within the loader lambda.");
-            this.idMap.add(value.id(), value);
+            this.ids.set(value.id(), value);
             this.namespaceMap.put(value.name(), value);
         }
 
diff --git a/src/main/java/net/minestom/server/utils/ObjectArray.java b/src/main/java/net/minestom/server/utils/ObjectArray.java
new file mode 100644
index 000000000..50544ca46
--- /dev/null
+++ b/src/main/java/net/minestom/server/utils/ObjectArray.java
@@ -0,0 +1,47 @@
+package net.minestom.server.utils;
+
+import org.jetbrains.annotations.ApiStatus;
+
+/**
+ * Represents an array which will be resized to the highest required index.
+ *
+ * @param <T> the type of the array
+ */
+@ApiStatus.Internal
+public final class ObjectArray<T> {
+    private T[] array;
+    private int max;
+
+    public ObjectArray(int size) {
+        this.array = allocate(size);
+    }
+
+    public ObjectArray() {
+        this(0);
+    }
+
+    public void set(int index, T object) {
+        if (index >= array.length) {
+            T[] newArray = allocate(index * 2 + 1);
+            System.arraycopy(array, 0, newArray, 0, array.length);
+            this.array = newArray;
+        }
+        array[index] = object;
+        this.max = Math.max(max, index);
+    }
+
+    public T get(int index) {
+        return index < array.length ? array[index] : null;
+    }
+
+    public void trim() {
+        T[] newArray = allocate(max + 1);
+        System.arraycopy(array, 0, newArray, 0, max + 1);
+        this.array = newArray;
+    }
+
+    private static <T> T[] allocate(int length) {
+        //noinspection unchecked
+        return (T[]) new Object[length];
+    }
+}