diff --git a/.github/workflows/ci-build.yml b/.github/workflows/ci-build.yml
index f86f143..c6652e2 100644
--- a/.github/workflows/ci-build.yml
+++ b/.github/workflows/ci-build.yml
@@ -53,4 +53,4 @@ jobs:
           token: ${{ secrets.CODECOV_TOKEN }}
           file: ./coverage.xml
           flags: php
-          fail_ci_if_error: false
+          fail_ci_if_error: false
\ No newline at end of file
diff --git a/examples/swoole.php b/examples/swoole.php
new file mode 100644
index 0000000..c8b479c
--- /dev/null
+++ b/examples/swoole.php
@@ -0,0 +1,23 @@
+<?php
+
+declare(strict_types=1);
+
+use Spiral\Goridge;
+use Swoole\Coroutine as Co;
+use Swoole\Coroutine\Barrier;
+
+require 'vendor/autoload.php';
+
+Co::set(['hook_flags'=> SWOOLE_HOOK_ALL]);
+Co\Run(function () {
+    $barrier = Barrier::make();
+    for ($i = 0; $i < 3; $i++) {
+        go(function () use ($barrier) {
+            $rpc = new Goridge\RPC\RPC(
+                Goridge\Relay::create('tcp://127.0.0.1:6001')
+            );
+            echo $rpc->call('App.Hi', 'Antony');
+        });
+    }
+    Barrier::wait($barrier);
+});
\ No newline at end of file
diff --git a/src/RPC/RPC.php b/src/RPC/RPC.php
index 1e07e9f..f2d4b49 100644
--- a/src/RPC/RPC.php
+++ b/src/RPC/RPC.php
@@ -30,11 +30,6 @@ class RPC implements RPCInterface
      */
     private ?string $service = null;
 
-    /**
-     * @var positive-int
-     */
-    private static int $seq = 1;
-
     /**
      * @param RelayInterface $relay
      * @param CodecInterface|null $codec
@@ -76,7 +71,9 @@ public function withCodec(CodecInterface $codec): RPCInterface
      */
     public function call(string $method, $payload, $options = null)
     {
-        $this->relay->send($this->packFrame($method, $payload));
+        $seq = $this->relay->getNextSeq();
+
+        $this->relay->send($this->packFrame($method, $payload, $seq));
 
         // wait for the frame confirmation
         $frame = $this->relay->waitFrame();
@@ -85,12 +82,10 @@ public function call(string $method, $payload, $options = null)
             throw new RPCException('Invalid RPC frame, options missing');
         }
 
-        if ($frame->options[0] !== self::$seq) {
+        if ($frame->options[0] !== $seq) {
             throw new RPCException('Invalid RPC frame, sequence mismatch');
         }
 
-        self::$seq++;
-
         return $this->decodeResponse($frame, $options);
     }
 
@@ -163,13 +158,13 @@ private function decodeResponse(Frame $frame, $options = null)
      * @param mixed $payload
      * @return Frame
      */
-    private function packFrame(string $method, $payload): Frame
+    private function packFrame(string $method, $payload, int $seq): Frame
     {
         if ($this->service !== null) {
             $method = $this->service . '.' . \ucfirst($method);
         }
 
         $body = $method . $this->codec->encode($payload);
-        return new Frame($body, [self::$seq, \strlen($method)], $this->codec->getIndex());
+        return new Frame($body, [$seq, \strlen($method)], $this->codec->getIndex());
     }
 }
diff --git a/src/Relay.php b/src/Relay.php
index ec4794d..a967452 100644
--- a/src/Relay.php
+++ b/src/Relay.php
@@ -13,6 +13,11 @@ abstract class Relay implements RelayInterface
     public const PIPES = 'pipes';
     protected const CONNECTION_EXP = '/(?P<protocol>[^:\/]+):\/\/(?P<arg1>[^:]+)(:(?P<arg2>[^:]+))?/';
 
+    /**
+     * @var int
+     */
+    private int $seq = 1;
+
     /**
      * Create relay using string address.
      *
@@ -93,4 +98,12 @@ private static function openOut(string $output)
 
         return $resource;
     }
+
+    /**
+     * @return int
+     */
+    public function getNextSeq(): int
+    {
+        return $this->seq++;
+    }
 }
diff --git a/src/RelayInterface.php b/src/RelayInterface.php
index 209983c..27e7f96 100644
--- a/src/RelayInterface.php
+++ b/src/RelayInterface.php
@@ -21,4 +21,9 @@ public function waitFrame(): Frame;
      * @param Frame $frame
      */
     public function send(Frame $frame): void;
+
+    /**
+     * @return int
+     */
+    public function getNextSeq(): int;
 }