diff --git a/Abstracts/TraitServer.php b/Abstracts/TraitServer.php
index a745dd0..aa15496 100644
--- a/Abstracts/TraitServer.php
+++ b/Abstracts/TraitServer.php
@@ -70,7 +70,7 @@ trait TraitServer
 		if (get_called_class() != CoroutineServer::class) {
 			pcntl_signal(SIGINT, [$this, 'onSigint']);
 		} else {
-			Coroutine::create(function () use ($signal, $callback) {
+			Coroutine::create(static function () use ($signal, $callback) {
 				$data = Coroutine::waitSignal($signal);
 				if ($data) {
 					$callback($signal, [true]);
diff --git a/CoroutineServer.php b/CoroutineServer.php
index 651cc68..56a1b50 100644
--- a/CoroutineServer.php
+++ b/CoroutineServer.php
@@ -176,7 +176,7 @@ class CoroutineServer implements ServerInterface
 			
 			$this->onTasker();
 			foreach ($this->servers as $server) {
-				Coroutine::create(function () use ($server) {
+				Coroutine::create(static function () use ($server) {
 					$server->start();
 				});
 			}
@@ -216,7 +216,7 @@ class CoroutineServer implements ServerInterface
 		
 		$this->channel = new Coroutine\Channel($config[Constant::OPTION_TASK_WORKER_NUM]);
 		for ($i = 0; $i < $config[Constant::OPTION_TASK_WORKER_NUM]; $i++) {
-			Coroutine::create(fn() => $this->taskRunner($i, $taskEvents, $finishEvents));
+			Coroutine::create(static fn() => $this->taskRunner($i, $taskEvents, $finishEvents));
 		}
 	}