diff --git a/src/Symfony/Component/Yaml/Inline.php b/src/Symfony/Component/Yaml/Inline.php
index 9672e2c35c0d6..bcb1ed8874179 100644
--- a/src/Symfony/Component/Yaml/Inline.php
+++ b/src/Symfony/Component/Yaml/Inline.php
@@ -211,7 +211,19 @@ public static function dump($value, int $flags = 0): string
      */
     public static function isHash($value): bool
     {
-        return !\is_array($value) || !array_is_list($value);
+        if ($value instanceof \stdClass || $value instanceof \ArrayObject) {
+            return true;
+        }
+
+        $expectedKey = 0;
+
+        foreach ($value as $key => $val) {
+            if ($key !== $expectedKey++) {
+                return true;
+            }
+        }
+
+        return false;
     }
 
     /**
diff --git a/src/Symfony/Component/Yaml/composer.json b/src/Symfony/Component/Yaml/composer.json
index a3a4bb832f441..f8919aead29af 100644
--- a/src/Symfony/Component/Yaml/composer.json
+++ b/src/Symfony/Component/Yaml/composer.json
@@ -18,9 +18,7 @@
     "require": {
         "php": ">=7.2.5",
         "symfony/deprecation-contracts": "^2.1",
-        "symfony/polyfill-ctype": "^1.8",
-        "symfony/polyfill-php80": "^1.16",
-        "symfony/polyfill-php81": "^1.22"
+        "symfony/polyfill-ctype": "^1.8"
     },
     "require-dev": {
         "symfony/console": "^5.3|^6.0"