diff --git a/composer.json b/composer.json
index 951fc70..af2d28d 100644
--- a/composer.json
+++ b/composer.json
@@ -23,7 +23,7 @@
     "symfony/console": "^2.7"
   },
   "require": {
-    "php": ">=5.6.0"
+    "php": ">=8.1"
   },
   "autoload": {
     "files": [
diff --git a/src/Collection.php b/src/Collection.php
index f8037a0..087414a 100644
--- a/src/Collection.php
+++ b/src/Collection.php
@@ -8,7 +8,7 @@
 use IteratorAggregate;
 use Traversable;
 
-class Collection implements IteratorAggregate, \Serializable, CollectionInterface
+class Collection implements IteratorAggregate, CollectionInterface
 {
     use CollectionTrait;
 
@@ -95,7 +95,7 @@ public static function range($start = 0, $end = null, $step = 1)
      * {@inheritdoc}
      * @throws InvalidReturnValue
      */
-    public function getIterator()
+    public function getIterator(): Traversable
     {
         if ($this->inputFactory) {
             $input = call_user_func($this->inputFactory);
@@ -131,6 +131,18 @@ function ($value, $key) {
         );
     }
 
+    public function __serialize()
+    {
+        return toArray(
+            map(
+                $this->input,
+                function ($value, $key) {
+                    return [$key, $value];
+                }
+            )
+        );
+    }
+
     /**
      * {@inheritdoc}
      */
@@ -138,4 +150,9 @@ public function unserialize($serialized)
     {
         $this->input = dereferenceKeyValue(unserialize($serialized));
     }
+
+    public function __unserialize($data)
+    {
+        $this->input = dereferenceKeyValue($data);
+    }
 }