diff --git a/src/WebSocket/Adapter.php b/src/WebSocket/Adapter.php
index 540e8e3..b8fa8c0 100644
--- a/src/WebSocket/Adapter.php
+++ b/src/WebSocket/Adapter.php
@@ -122,11 +122,4 @@ abstract public function setWorkerNumber(int $num): self;
      * @return mixed
      */
     abstract public function getNative(): mixed;
-
-    /**
-     * Returns all connections.
-     *
-     * @return array<mixed>
-     */
-    abstract public function getConnections(): array;
 }
diff --git a/src/WebSocket/Adapter/Swoole.php b/src/WebSocket/Adapter/Swoole.php
index 15af799..fc891e4 100644
--- a/src/WebSocket/Adapter/Swoole.php
+++ b/src/WebSocket/Adapter/Swoole.php
@@ -16,10 +16,6 @@ class Swoole extends Adapter
     protected string $host;
 
     protected int $port;
-    /**
-    * @var array<int|string,bool|int|string>
-    */
-    private static array $connections = [];
 
     public function __construct(string $host = '0.0.0.0', int $port = 80)
     {
@@ -103,8 +99,6 @@ public function onWorkerStop(callable $callback): Adapter
     public function onOpen(callable $callback): self
     {
         $this->server->on('open', function (Server $server, Request $request) use ($callback) {
-            self::$connections[$request->fd] = true;
-
             call_user_func($callback, $request->fd, $request);
         });
 
@@ -123,8 +117,6 @@ public function onMessage(callable $callback): self
     public function onClose(callable $callback): self
     {
         $this->server->on('close', function (Server $server, int $fd) use ($callback) {
-            unset(self::$connections[$fd]);
-
             call_user_func($callback, $fd);
         });
 
@@ -165,9 +157,4 @@ public function getNative(): Server
     {
         return $this->server;
     }
-
-    public function getConnections(): array
-    {
-        return array_keys(self::$connections);
-    }
 }
diff --git a/src/WebSocket/Adapter/Workerman.php b/src/WebSocket/Adapter/Workerman.php
index b95234f..1f510a9 100644
--- a/src/WebSocket/Adapter/Workerman.php
+++ b/src/WebSocket/Adapter/Workerman.php
@@ -155,9 +155,4 @@ public function getNative(): Worker
     {
         return $this->server;
     }
-
-    public function getConnections(): array
-    {
-        return array_keys(TcpConnection::$connections);
-    }
 }
diff --git a/src/WebSocket/Server.php b/src/WebSocket/Server.php
index 984eb34..795ef8c 100644
--- a/src/WebSocket/Server.php
+++ b/src/WebSocket/Server.php
@@ -214,16 +214,6 @@ public function onRequest(callable $callback): self
         return $this;
     }
 
-    /**
-     * Returns all connections.
-     *
-     * @return array<mixed>
-     */
-    public function getConnections(): array
-    {
-        return $this->adapter->getConnections();
-    }
-
     /**
      * Register callback. Will be executed when error occurs.
      *
diff --git a/tests/servers/Swoole/server.php b/tests/servers/Swoole/server.php
index 54c88d1..59dca4d 100644
--- a/tests/servers/Swoole/server.php
+++ b/tests/servers/Swoole/server.php
@@ -11,6 +11,9 @@
 
 $server = new WebSocket\Server($adapter);
 
+/** @var array<int,bool> $connections */
+$connections = [];
+
 $server
     ->onWorkerStart(function (int $workerId) {
         echo 'worker started ', $workerId, PHP_EOL;
@@ -18,13 +21,15 @@
     ->onWorkerStop(function (int $workerId) {
         echo "worker stopped ", $workerId, PHP_EOL;
     })
-    ->onOpen(function (int $connection, Request $request) {
+    ->onOpen(function (int $connection, Request $request) use (&$connections) {
+        $connections[$connection] = true;
         echo 'connected ', $connection, PHP_EOL;
     })
-    ->onClose(function (int $connection) {
+    ->onClose(function (int $connection) use (&$connections) {
+        unset($connections[$connection]);
         echo 'disconnected ', $connection, PHP_EOL;
     })
-    ->onMessage(function (int $connection, string $message) use ($server) {
+    ->onMessage(function (int $connection, string $message) use ($server, &$connections) {
         echo $message, PHP_EOL;
 
         switch ($message) {
@@ -35,7 +40,7 @@
                 $server->send([$connection], 'ping');
                 break;
             case 'broadcast':
-                $server->send($server->getConnections(), 'broadcast');
+                $server->send(array_keys($connections), 'broadcast');
                 break;
             case 'disconnect':
                 $server->send([$connection], 'disconnect');
@@ -43,7 +48,7 @@
                 break;
         }
     })
-    ->onRequest(function (Request $request, Response $response) use ($server) {
+    ->onRequest(function (Request $request, Response $response) use (&$connections) {
         echo 'HTTP request received: ', $request->server['request_uri'], PHP_EOL;
 
         if ($request->server['request_uri'] === '/health') {
@@ -55,7 +60,7 @@
             $response->status(200);
             $response->end(json_encode([
                 'server' => 'Swoole WebSocket',
-                'connections' => count($server->getConnections()),
+                'connections' => count($connections),
                 'timestamp' => time()
             ]));
         } else {
diff --git a/tests/servers/Workerman/server.php b/tests/servers/Workerman/server.php
index 3333300..ee3e8e0 100644
--- a/tests/servers/Workerman/server.php
+++ b/tests/servers/Workerman/server.php
@@ -11,6 +11,9 @@
 
 $server = new WebSocket\Server($adapter);
 
+/** @var array<int,bool> $connections */
+$connections = [];
+
 $server
     ->onWorkerStart(function (int $workerId) {
         echo 'worker started ', $workerId, PHP_EOL;
@@ -18,13 +21,15 @@
     ->onWorkerStop(function (int $workerId) {
         echo "worker stopped ", $workerId, PHP_EOL;
     })
-    ->onOpen(function (int $connection, array $request) {
+    ->onOpen(function (int $connection, array $request) use (&$connections) {
+        $connections[$connection] = true;
         echo 'connected ', $connection, PHP_EOL;
     })
-    ->onClose(function (int $connection) {
+    ->onClose(function (int $connection) use (&$connections) {
+        unset($connections[$connection]);
         echo 'disconnected ', $connection, PHP_EOL;
     })
-    ->onMessage(function (int $connection, string $message) use ($server) {
+    ->onMessage(function (int $connection, string $message) use ($server, &$connections) {
         echo $message, PHP_EOL;
 
         switch ($message) {
@@ -35,7 +40,7 @@
                 $server->send([$connection], 'ping');
                 break;
             case 'broadcast':
-                $server->send($server->getConnections(), 'broadcast');
+                $server->send(array_keys($connections), 'broadcast');
                 break;
             case 'disconnect':
                 $server->send([$connection], 'disconnect');
@@ -43,7 +48,7 @@
                 break;
         }
     })
-    ->onRequest(function (TcpConnection $connection, Request $request) use ($server) {
+    ->onRequest(function (TcpConnection $connection, Request $request) use (&$connections) {
         $path = $request->path();
         if (!is_string($path)) {
             throw new \Exception('Invalid path ' . $path . ' for request: ' . json_encode($request, JSON_PRETTY_PRINT));
@@ -61,7 +66,7 @@
                              'Connection: close' . "\r\n\r\n" .
                              json_encode([
                                  'server' => 'Workerman WebSocket',
-                                 'connections' => count($server->getConnections()),
+                                 'connections' => count($connections),
                                  'timestamp' => time()
                              ]));
         } else {