diff --git a/Internal/CurlClientState.php b/Internal/CurlClientState.php
index 8af4c75..60aab71 100644
--- a/Internal/CurlClientState.php
+++ b/Internal/CurlClientState.php
@@ -83,7 +83,6 @@ public function reset(): void
         foreach ($this->pushedResponses as $url => $response) {
             $this->logger?->debug(\sprintf('Unused pushed response: "%s"', $url));
             curl_multi_remove_handle($this->handle, $response->handle);
-            curl_close($response->handle);
         }
 
         $this->pushedResponses = [];
diff --git a/Response/AmpResponseV4.php b/Response/AmpResponseV4.php
index e1fc119..3f652a4 100644
--- a/Response/AmpResponseV4.php
+++ b/Response/AmpResponseV4.php
@@ -101,7 +101,8 @@ public function __construct(
 
         $throttleWatcher = null;
 
-        $this->id = $id = self::$nextId++;
+        $this->id = $id = self::$nextId;
+        self::$nextId = str_increment(self::$nextId);
         Loop::defer(static function () use ($request, $multi, $id, &$info, &$headers, $canceller, &$options, $onProgress, &$handle, $logger, &$pause) {
             return new Coroutine(self::generateResponse($request, $multi, $id, $info, $headers, $canceller, $options, $onProgress, $handle, $logger, $pause));
         });
diff --git a/Response/AmpResponseV5.php b/Response/AmpResponseV5.php
index 7fc1036..2a673be 100644
--- a/Response/AmpResponseV5.php
+++ b/Response/AmpResponseV5.php
@@ -96,7 +96,8 @@ public function __construct(
         };
 
         $pause = 0.0;
-        $this->id = $id = self::$nextId++;
+        $this->id = $id = self::$nextId;
+        self::$nextId = str_increment(self::$nextId);
 
         $info['pause_handler'] = static function (float $duration) use (&$pause) {
             $pause = $duration;
diff --git a/composer.json b/composer.json
index 39e43f5..869bab8 100644
--- a/composer.json
+++ b/composer.json
@@ -26,6 +26,7 @@
         "psr/log": "^1|^2|^3",
         "symfony/deprecation-contracts": "^2.5|^3",
         "symfony/http-client-contracts": "~3.4.4|^3.5.2",
+        "symfony/polyfill-php83": "^1.29",
         "symfony/service-contracts": "^2.5|^3"
     },
     "require-dev": {