diff --git a/src/Symfony/Component/Yaml/Dumper.php b/src/Symfony/Component/Yaml/Dumper.php
index dcb104ccff065..2cbae238cc059 100644
--- a/src/Symfony/Component/Yaml/Dumper.php
+++ b/src/Symfony/Component/Yaml/Dumper.php
@@ -48,7 +48,7 @@ public function __construct(int $indentation = 4)
      *
      * @return string The YAML representation of the PHP value
      */
-    public function dump($input, int $inline = 0, int $indent = 0, int $flags = 0): string
+    public function dump(mixed $input, int $inline = 0, int $indent = 0, int $flags = 0): string
     {
         $output = '';
         $prefix = $indent ? str_repeat(' ', $indent) : '';
diff --git a/src/Symfony/Component/Yaml/Inline.php b/src/Symfony/Component/Yaml/Inline.php
index 349ed6c94e727..4e7645022bbfa 100644
--- a/src/Symfony/Component/Yaml/Inline.php
+++ b/src/Symfony/Component/Yaml/Inline.php
@@ -200,12 +200,8 @@ public static function dump($value, int $flags = 0): string
 
     /**
      * Check if given array is hash or just normal indexed array.
-     *
-     * @param array|\ArrayObject|\stdClass $value The PHP array or array-like object to check
-     *
-     * @return bool true if value is hash array, false otherwise
      */
-    public static function isHash($value): bool
+    public static function isHash(array|\ArrayObject|\stdClass $value): bool
     {
         if ($value instanceof \stdClass || $value instanceof \ArrayObject) {
             return true;
diff --git a/src/Symfony/Component/Yaml/Tag/TaggedValue.php b/src/Symfony/Component/Yaml/Tag/TaggedValue.php
index 4ea3406135999..55676ac785106 100644
--- a/src/Symfony/Component/Yaml/Tag/TaggedValue.php
+++ b/src/Symfony/Component/Yaml/Tag/TaggedValue.php
@@ -20,7 +20,7 @@ final class TaggedValue
     private $tag;
     private $value;
 
-    public function __construct(string $tag, $value)
+    public function __construct(string $tag, mixed $value)
     {
         $this->tag = $tag;
         $this->value = $value;
diff --git a/src/Symfony/Component/Yaml/Yaml.php b/src/Symfony/Component/Yaml/Yaml.php
index 4fea47f9a7488..2664684c38fa2 100644
--- a/src/Symfony/Component/Yaml/Yaml.php
+++ b/src/Symfony/Component/Yaml/Yaml.php
@@ -93,7 +93,7 @@ public static function parse(string $input, int $flags = 0)
      *
      * @return string A YAML string representing the original PHP value
      */
-    public static function dump($input, int $inline = 2, int $indent = 4, int $flags = 0): string
+    public static function dump(mixed $input, int $inline = 2, int $indent = 4, int $flags = 0): string
     {
         $yaml = new Dumper($indent);