diff --git a/src/Composer/DependencyResolver/Decisions.php b/src/Composer/DependencyResolver/Decisions.php
index 8dfd8d86d..6a4809d5d 100644
--- a/src/Composer/DependencyResolver/Decisions.php
+++ b/src/Composer/DependencyResolver/Decisions.php
@@ -205,20 +205,12 @@ class Decisions implements \Iterator, \Countable
         array_pop($this->decisionQueue);
     }
 
-    /**
-     * @return int
-     */
-    #[\ReturnTypeWillChange]
-    public function count()
+    public function count(): int
     {
         return \count($this->decisionQueue);
     }
 
-    /**
-     * @return void
-     */
-    #[\ReturnTypeWillChange]
-    public function rewind()
+    public function rewind(): void
     {
         end($this->decisionQueue);
     }
@@ -232,29 +224,17 @@ class Decisions implements \Iterator, \Countable
         return current($this->decisionQueue);
     }
 
-    /**
-     * @return ?int
-     */
-    #[\ReturnTypeWillChange]
-    public function key()
+    public function key(): ?int
     {
         return key($this->decisionQueue);
     }
 
-    /**
-     * @return void
-     */
-    #[\ReturnTypeWillChange]
-    public function next()
+    public function next(): void
     {
         prev($this->decisionQueue);
     }
 
-    /**
-     * @return bool
-     */
-    #[\ReturnTypeWillChange]
-    public function valid()
+    public function valid(): bool
     {
         return false !== current($this->decisionQueue);
     }
diff --git a/src/Composer/DependencyResolver/Pool.php b/src/Composer/DependencyResolver/Pool.php
index 857f62df8..0fa5783e4 100644
--- a/src/Composer/DependencyResolver/Pool.php
+++ b/src/Composer/DependencyResolver/Pool.php
@@ -129,10 +129,8 @@ class Pool implements \Countable
 
     /**
      * Returns how many packages have been loaded into the pool
-     * @return int
      */
-    #[\ReturnTypeWillChange]
-    public function count()
+    public function count(): int
     {
         return \count($this->packages);
     }
diff --git a/src/Composer/DependencyResolver/RuleSet.php b/src/Composer/DependencyResolver/RuleSet.php
index b754046a6..47868178f 100644
--- a/src/Composer/DependencyResolver/RuleSet.php
+++ b/src/Composer/DependencyResolver/RuleSet.php
@@ -103,11 +103,7 @@ class RuleSet implements \IteratorAggregate, \Countable
         }
     }
 
-    /**
-     * @return int
-     */
-    #[\ReturnTypeWillChange]
-    public function count()
+    public function count(): int
     {
         return $this->nextRuleId;
     }
@@ -127,11 +123,7 @@ class RuleSet implements \IteratorAggregate, \Countable
         return $this->rules;
     }
 
-    /**
-     * @return RuleSetIterator
-     */
-    #[\ReturnTypeWillChange]
-    public function getIterator()
+    public function getIterator(): RuleSetIterator
     {
         return new RuleSetIterator($this->getRules());
     }
diff --git a/src/Composer/DependencyResolver/RuleSetIterator.php b/src/Composer/DependencyResolver/RuleSetIterator.php
index 1450c1cba..e7afb55d3 100644
--- a/src/Composer/DependencyResolver/RuleSetIterator.php
+++ b/src/Composer/DependencyResolver/RuleSetIterator.php
@@ -42,11 +42,7 @@ class RuleSetIterator implements \Iterator
         $this->rewind();
     }
 
-    /**
-     * @return Rule
-     */
-    #[\ReturnTypeWillChange]
-    public function current()
+    public function current(): Rule
     {
         return $this->rules[$this->currentType][$this->currentOffset];
     }
@@ -54,17 +50,12 @@ class RuleSetIterator implements \Iterator
     /**
      * @return RuleSet::TYPE_*|-1
      */
-    #[\ReturnTypeWillChange]
-    public function key()
+    public function key(): int
     {
         return $this->currentType;
     }
 
-    /**
-     * @return void
-     */
-    #[\ReturnTypeWillChange]
-    public function next()
+    public function next(): void
     {
         $this->currentOffset++;
 
@@ -88,11 +79,7 @@ class RuleSetIterator implements \Iterator
         }
     }
 
-    /**
-     * @return void
-     */
-    #[\ReturnTypeWillChange]
-    public function rewind()
+    public function rewind(): void
     {
         $this->currentOffset = 0;
 
@@ -111,11 +98,7 @@ class RuleSetIterator implements \Iterator
         } while (isset($this->types[$this->currentTypeOffset]) && !\count($this->rules[$this->currentType]));
     }
 
-    /**
-     * @return bool
-     */
-    #[\ReturnTypeWillChange]
-    public function valid()
+    public function valid(): bool
     {
         return isset($this->rules[$this->currentType], $this->rules[$this->currentType][$this->currentOffset]);
     }
diff --git a/src/Composer/Package/Archiver/ArchivableFilesFilter.php b/src/Composer/Package/Archiver/ArchivableFilesFilter.php
index 6f25923d7..3242df7e8 100644
--- a/src/Composer/Package/Archiver/ArchivableFilesFilter.php
+++ b/src/Composer/Package/Archiver/ArchivableFilesFilter.php
@@ -23,8 +23,7 @@ class ArchivableFilesFilter extends FilterIterator
     /**
      * @return bool true if the current element is acceptable, otherwise false.
      */
-    #[\ReturnTypeWillChange]
-    public function accept()
+    public function accept(): bool
     {
         $file = $this->getInnerIterator()->current();
         if ($file->isDir()) {
diff --git a/src/Composer/Package/Archiver/ArchivableFilesFinder.php b/src/Composer/Package/Archiver/ArchivableFilesFinder.php
index 4dcb718ba..b1d5650ed 100644
--- a/src/Composer/Package/Archiver/ArchivableFilesFinder.php
+++ b/src/Composer/Package/Archiver/ArchivableFilesFinder.php
@@ -90,8 +90,7 @@ class ArchivableFilesFinder extends \FilterIterator
         parent::__construct($this->finder->getIterator());
     }
 
-    #[\ReturnTypeWillChange]
-    public function accept()
+    public function accept(): bool
     {
         /** @var SplFileInfo $current */
         $current = $this->getInnerIterator()->current();
diff --git a/src/Composer/Repository/ArrayRepository.php b/src/Composer/Repository/ArrayRepository.php
index 3d4e15abd..03e5fd819 100644
--- a/src/Composer/Repository/ArrayRepository.php
+++ b/src/Composer/Repository/ArrayRepository.php
@@ -322,8 +322,7 @@ class ArrayRepository implements RepositoryInterface
      *
      * @return int Number of packages
      */
-    #[\ReturnTypeWillChange]
-    public function count()
+    public function count(): int
     {
         if (null === $this->packages) {
             $this->initialize();
diff --git a/src/Composer/Repository/CompositeRepository.php b/src/Composer/Repository/CompositeRepository.php
index d6cfc46e7..83603081c 100644
--- a/src/Composer/Repository/CompositeRepository.php
+++ b/src/Composer/Repository/CompositeRepository.php
@@ -178,8 +178,7 @@ class CompositeRepository implements RepositoryInterface
     /**
      * @inheritDoc
      */
-    #[\ReturnTypeWillChange]
-    public function count()
+    public function count(): int
     {
         $total = 0;
         foreach ($this->repositories as $repository) {
diff --git a/src/Composer/Repository/FilterRepository.php b/src/Composer/Repository/FilterRepository.php
index 0ee1ae53d..6e27cf837 100644
--- a/src/Composer/Repository/FilterRepository.php
+++ b/src/Composer/Repository/FilterRepository.php
@@ -181,8 +181,7 @@ class FilterRepository implements RepositoryInterface
     /**
      * @inheritDoc
      */
-    #[\ReturnTypeWillChange]
-    public function count()
+    public function count(): int
     {
         if ($this->repo->count() > 0) {
             return count($this->getPackages());
diff --git a/src/Composer/Util/ErrorHandler.php b/src/Composer/Util/ErrorHandler.php
index 1bb7d4301..4a7901b41 100644
--- a/src/Composer/Util/ErrorHandler.php
+++ b/src/Composer/Util/ErrorHandler.php
@@ -54,15 +54,6 @@ class ErrorHandler
         }
 
         if (self::$io) {
-            // ignore symfony/* deprecation warnings
-            // TODO remove in 2.3
-            if (Preg::isMatch('{^Return type of Symfony\\\\.*ReturnTypeWillChange}is', $message)) {
-                return true;
-            }
-            if (strpos(strtr($file, '\\', '/'), 'vendor/symfony/') !== false) {
-                return true;
-            }
-
             self::$io->writeError('<warning>Deprecation Notice: '.$message.' in '.$file.':'.$line.'</warning>');
             if (self::$io->isVerbose()) {
                 self::$io->writeError('<warning>Stack trace:</warning>');