diff --git a/src/inventory/BaseInventory.php b/src/inventory/BaseInventory.php
index 98419a01a2..bcfefe272f 100644
--- a/src/inventory/BaseInventory.php
+++ b/src/inventory/BaseInventory.php
@@ -90,6 +90,8 @@ abstract class BaseInventory implements Inventory{
 			$items = array_slice($items, 0, $this->getSize(), true);
 		}
 
+		$oldContents = $this->slots->toArray();
+
 		$listeners = $this->listeners;
 		$this->listeners = [];
 		$viewers = $this->viewers;
@@ -109,7 +111,7 @@ abstract class BaseInventory implements Inventory{
 		}
 
 		foreach($this->listeners as $listener){
-			$listener->onContentChange($this);
+			$listener->onContentChange($this, $oldContents);
 		}
 
 		foreach($this->getViewers() as $viewer){
@@ -359,7 +361,7 @@ abstract class BaseInventory implements Inventory{
 
 	protected function onSlotChange(int $index, Item $before) : void{
 		foreach($this->listeners as $listener){
-			$listener->onSlotChange($this, $index);
+			$listener->onSlotChange($this, $index, $before);
 		}
 		foreach($this->viewers as $viewer){
 			$viewer->getNetworkSession()->getInvManager()->syncSlot($this, $index);
diff --git a/src/inventory/CallbackInventoryChangeListener.php b/src/inventory/CallbackInventoryChangeListener.php
index 388b9bf1bb..c3b12a6d49 100644
--- a/src/inventory/CallbackInventoryChangeListener.php
+++ b/src/inventory/CallbackInventoryChangeListener.php
@@ -23,6 +23,7 @@ declare(strict_types=1);
 
 namespace pocketmine\inventory;
 
+use pocketmine\item\Item;
 use pocketmine\utils\Utils;
 
 class CallbackInventoryChangeListener implements InventoryChangeListener{
@@ -31,25 +32,25 @@ class CallbackInventoryChangeListener implements InventoryChangeListener{
 
 	/**
 	 * @var \Closure|null
-	 * @phpstan-var (\Closure(Inventory, int) : void)|null
+	 * @phpstan-var (\Closure(Inventory, int, Item) : void)|null
 	 */
 	private $onSlotChangeCallback;
 	/**
 	 * @var \Closure|null
-	 * @phpstan-var (\Closure(Inventory) : void)|null
+	 * @phpstan-var (\Closure(Inventory, Item[]) : void)|null
 	 */
 	private $onContentChangeCallback;
 
 	/**
-	 * @phpstan-param (\Closure(Inventory, int) : void)|null $onSlotChange
-	 * @phpstan-param (\Closure(Inventory) : void)|null $onContentChange
+	 * @phpstan-param (\Closure(Inventory, int, Item) : void)|null $onSlotChange
+	 * @phpstan-param (\Closure(Inventory, Item[]) : void)|null $onContentChange
 	 */
 	public function __construct(?\Closure $onSlotChange, ?\Closure $onContentChange){
 		if($onSlotChange !== null){
-			Utils::validateCallableSignature(function(Inventory $inventory, int $slot) : void{}, $onSlotChange);
+			Utils::validateCallableSignature(function(Inventory $inventory, int $slot, Item $oldItem) : void{}, $onSlotChange);
 		}
 		if($onContentChange !== null){
-			Utils::validateCallableSignature(function(Inventory $inventory) : void{}, $onContentChange);
+			Utils::validateCallableSignature(function(Inventory $inventory, array $oldContents) : void{}, $onContentChange);
 		}
 
 		$this->onSlotChangeCallback = $onSlotChange;
@@ -61,20 +62,23 @@ class CallbackInventoryChangeListener implements InventoryChangeListener{
 	 */
 	public static function onAnyChange(\Closure $onChange) : self{
 		return new self(
-			static function(Inventory $inventory, int $unused) use ($onChange) : void{
+			static function(Inventory $inventory, int $unused, Item $unusedB) use ($onChange) : void{
 				$onChange($inventory);
 			},
-			static function(Inventory $inventory) use ($onChange) : void{
+			static function(Inventory $inventory, array $unused) use ($onChange) : void{
 				$onChange($inventory);
 			}
 		);
 	}
 
-	public function onSlotChange(Inventory $inventory, int $slot) : void{
-		($this->onSlotChangeCallback)($inventory, $slot);
+	public function onSlotChange(Inventory $inventory, int $slot, Item $oldItem) : void{
+		($this->onSlotChangeCallback)($inventory, $slot, $oldItem);
 	}
 
-	public function onContentChange(Inventory $inventory) : void{
-		($this->onContentChangeCallback)($inventory);
+	/**
+	 * @param Item[] $oldContents
+	 */
+	public function onContentChange(Inventory $inventory, array $oldContents) : void{
+		($this->onContentChangeCallback)($inventory, $oldContents);
 	}
 }
diff --git a/src/inventory/InventoryChangeListener.php b/src/inventory/InventoryChangeListener.php
index d13edf7f08..60069305ef 100644
--- a/src/inventory/InventoryChangeListener.php
+++ b/src/inventory/InventoryChangeListener.php
@@ -23,6 +23,8 @@ declare(strict_types=1);
 
 namespace pocketmine\inventory;
 
+use pocketmine\item\Item;
+
 /**
  * Classes implementing this interface can be injected into inventories to receive notifications when content changes
  * occur.
@@ -32,7 +34,10 @@ namespace pocketmine\inventory;
  */
 interface InventoryChangeListener{
 
-	public function onSlotChange(Inventory $inventory, int $slot) : void;
+	public function onSlotChange(Inventory $inventory, int $slot, Item $oldItem) : void;
 
-	public function onContentChange(Inventory $inventory) : void;
+	/**
+	 * @param Item[] $oldContents
+	 */
+	public function onContentChange(Inventory $inventory, array $oldContents) : void;
 }