diff --git a/lib/Doctrine/Collection/Iterator.php b/lib/Doctrine/Collection/Iterator.php
index 3fdc79cd0..1c6dbe283 100644
--- a/lib/Doctrine/Collection/Iterator.php
+++ b/lib/Doctrine/Collection/Iterator.php
@@ -74,6 +74,7 @@ public function __construct($collection)
      *
      * @return void
      */
+    #[\ReturnTypeWillChange]
     public function rewind()
     {
         $this->index = 0;
@@ -88,6 +89,7 @@ public function rewind()
      *
      * @return integer
      */
+    #[\ReturnTypeWillChange]
     public function key()
     {
         return $this->key;
@@ -98,6 +100,7 @@ public function key()
      *
      * @return Doctrine_Record
      */
+    #[\ReturnTypeWillChange]
     public function current()
     {
         return $this->collection->get($this->key);
@@ -108,6 +111,7 @@ public function current()
      *
      * @return void
      */
+    #[\ReturnTypeWillChange]
     public function next()
     {
         $this->index++;
diff --git a/lib/Doctrine/Collection/Iterator/Expandable.php b/lib/Doctrine/Collection/Iterator/Expandable.php
index 7c18c5c58..3bfab7dd5 100644
--- a/lib/Doctrine/Collection/Iterator/Expandable.php
+++ b/lib/Doctrine/Collection/Iterator/Expandable.php
@@ -32,6 +32,7 @@
  */
 class Doctrine_Collection_Iterator_Expandable extends Doctrine_Collection_Iterator
 {
+    #[\ReturnTypeWillChange]
     public function valid()
     {
         if ($this->index < $this->count) {
diff --git a/lib/Doctrine/Collection/Iterator/Normal.php b/lib/Doctrine/Collection/Iterator/Normal.php
index 540bdad63..c256bd6fb 100644
--- a/lib/Doctrine/Collection/Iterator/Normal.php
+++ b/lib/Doctrine/Collection/Iterator/Normal.php
@@ -35,6 +35,7 @@ class Doctrine_Collection_Iterator_Normal extends Doctrine_Collection_Iterator
     /**
      * @return boolean                          whether or not the iteration will continue
      */
+    #[\ReturnTypeWillChange]
     public function valid()
     {
         return ($this->index < $this->count);
diff --git a/lib/Doctrine/Collection/Iterator/Offset.php b/lib/Doctrine/Collection/Iterator/Offset.php
index 181b73f21..128b1ef10 100644
--- a/lib/Doctrine/Collection/Iterator/Offset.php
+++ b/lib/Doctrine/Collection/Iterator/Offset.php
@@ -32,6 +32,7 @@
  */
 class Doctrine_Collection_Iterator_Offset extends Doctrine_Collection_Iterator
 {
+    #[\ReturnTypeWillChange]
     public function valid()
     { }
 }
\ No newline at end of file
diff --git a/lib/Doctrine/Node/MaterializedPath/LevelOrderIterator.php b/lib/Doctrine/Node/MaterializedPath/LevelOrderIterator.php
index 6283563c3..718a85c0d 100644
--- a/lib/Doctrine/Node/MaterializedPath/LevelOrderIterator.php
+++ b/lib/Doctrine/Node/MaterializedPath/LevelOrderIterator.php
@@ -41,26 +41,31 @@ public function __construct($node, $opts)
         throw new Doctrine_Exception('Not yet implemented');
     }
 
+    #[\ReturnTypeWillChange]
     public function rewind()
     {
         throw new Doctrine_Exception('Not yet implemented');
     }
 
+    #[\ReturnTypeWillChange]
     public function valid()
     {
         throw new Doctrine_Exception('Not yet implemented');
     }
 
+    #[\ReturnTypeWillChange]
     public function current()
     {
         throw new Doctrine_Exception('Not yet implemented');
     }
 
+    #[\ReturnTypeWillChange]
     public function key()
     {
         throw new Doctrine_Exception('Not yet implemented');
     }
 
+    #[\ReturnTypeWillChange]
     public function next()
     {
         throw new Doctrine_Exception('Not yet implemented');
diff --git a/lib/Doctrine/Node/MaterializedPath/PostOrderIterator.php b/lib/Doctrine/Node/MaterializedPath/PostOrderIterator.php
index 1cc002f06..be67e3678 100644
--- a/lib/Doctrine/Node/MaterializedPath/PostOrderIterator.php
+++ b/lib/Doctrine/Node/MaterializedPath/PostOrderIterator.php
@@ -41,26 +41,31 @@ public function __construct($node, $opts)
         throw new Doctrine_Exception('Not yet implemented');
     }
 
+    #[\ReturnTypeWillChange]
     public function rewind()
     {
         throw new Doctrine_Exception('Not yet implemented');
     }
 
+    #[\ReturnTypeWillChange]
     public function valid()
     {
         throw new Doctrine_Exception('Not yet implemented');
     }
 
+    #[\ReturnTypeWillChange]
     public function current()
     {
         throw new Doctrine_Exception('Not yet implemented');
     }
 
+    #[\ReturnTypeWillChange]
     public function key()
     {
         throw new Doctrine_Exception('Not yet implemented');
     }
 
+    #[\ReturnTypeWillChange]
     public function next()
     {
         throw new Doctrine_Exception('Not yet implemented');
diff --git a/lib/Doctrine/Node/MaterializedPath/PreOrderIterator.php b/lib/Doctrine/Node/MaterializedPath/PreOrderIterator.php
index 4ea31bd8c..d00438fec 100644
--- a/lib/Doctrine/Node/MaterializedPath/PreOrderIterator.php
+++ b/lib/Doctrine/Node/MaterializedPath/PreOrderIterator.php
@@ -41,26 +41,31 @@ public function __construct($node, $opts)
         throw new Doctrine_Exception('Not yet implemented');
     }
 
+    #[\ReturnTypeWillChange]
     public function rewind()
     {
         throw new Doctrine_Exception('Not yet implemented');
     }
 
+    #[\ReturnTypeWillChange]
     public function valid()
     {
         throw new Doctrine_Exception('Not yet implemented');
     }
 
+    #[\ReturnTypeWillChange]
     public function current()
     {
         throw new Doctrine_Exception('Not yet implemented');
     }
 
+    #[\ReturnTypeWillChange]
     public function key()
     {
         throw new Doctrine_Exception('Not yet implemented');
     }
 
+    #[\ReturnTypeWillChange]
     public function next()
     {
         throw new Doctrine_Exception('Not yet implemented');
diff --git a/lib/Doctrine/Node/NestedSet/PreOrderIterator.php b/lib/Doctrine/Node/NestedSet/PreOrderIterator.php
index a35a72223..9cc399d7d 100644
--- a/lib/Doctrine/Node/NestedSet/PreOrderIterator.php
+++ b/lib/Doctrine/Node/NestedSet/PreOrderIterator.php
@@ -100,6 +100,7 @@ public function __construct($record, $opts)
      *
      * @return void
      */
+    #[\ReturnTypeWillChange]
     public function rewind()
     {
         $this->index = -1;
@@ -111,6 +112,7 @@ public function rewind()
      *
      * @return integer
      */
+    #[\ReturnTypeWillChange]
     public function key()
     {
         return $this->key;
@@ -121,6 +123,7 @@ public function key()
      *
      * @return Doctrine_Record
      */
+    #[\ReturnTypeWillChange]
     public function current()
     {
         $record = $this->collection->get($this->key);
@@ -133,6 +136,7 @@ public function current()
      *
      * @return void
      */
+    #[\ReturnTypeWillChange]
     public function next()
     {
         while ($current = $this->advanceIndex()) {
@@ -149,6 +153,7 @@ public function next()
     /**
      * @return boolean                          whether or not the iteration will continue
      */
+    #[\ReturnTypeWillChange]
     public function valid()
     {
         return ($this->index < $this->count);