diff --git a/src/Pool/Dummy.php b/src/Pool/Dummy.php
index bd948b8..ab95aac 100644
--- a/src/Pool/Dummy.php
+++ b/src/Pool/Dummy.php
@@ -4,7 +4,6 @@
 
 use Evenement\EventEmitterTrait;
 use React\EventLoop\LoopInterface;
-use React\Promise\FulfilledPromise;
 use React\Promise\PromiseInterface;
 use WyriHaximus\React\ChildProcess\Messenger\Messages\Message;
 use WyriHaximus\React\ChildProcess\Messenger\Messages\Rpc;
@@ -30,7 +29,7 @@ public function __construct(ProcessCollectionInterface $processCollection, LoopI
      */
     public function rpc(Rpc $message)
     {
-        return new FulfilledPromise();
+        return \React\Promise\resolve();
     }
 
     /**
diff --git a/src/Queue/Overflow.php b/src/Queue/Overflow.php
index 893ccfa..82c396c 100644
--- a/src/Queue/Overflow.php
+++ b/src/Queue/Overflow.php
@@ -2,7 +2,6 @@
 
 namespace WyriHaximus\React\ChildProcess\Pool\Queue;
 
-use React\Promise\FulfilledPromise;
 use React\Promise\PromiseInterface;
 use WyriHaximus\React\ChildProcess\Messenger\Messages\Rpc;
 use WyriHaximus\React\ChildProcess\Pool\QueueInterface;
@@ -67,7 +66,7 @@ public function dequeue()
     protected function requeue()
     {
         if ($this->queue->count() === 0) {
-            return new FulfilledPromise();
+            return \React\Promise\resolve();
         }
 
         return \React\Promise\resolve($this->queue->dequeue())->then(function (Rpc $rpc) {