diff --git a/src/RPC/RPC.php b/src/RPC/RPC.php
index 09f6b05..adce49a 100644
--- a/src/RPC/RPC.php
+++ b/src/RPC/RPC.php
@@ -32,14 +32,8 @@ class RPC implements RPCInterface
 
     /**
      * @var positive-int
-     * @deprecated since v3.2.1.
      */
-    private static int $seq = 1;
-
-    /**
-     * @deprecated since v3.2.1. Need for backward compatibility.
-     */
-    private bool $hasSequence = false;
+    private int $seq = 1;
 
     /**
      * @param RelayInterface $relay
@@ -49,8 +43,6 @@ public function __construct(RelayInterface $relay, CodecInterface $codec = null)
     {
         $this->relay = $relay;
         $this->codec = $codec ?? new JsonCodec();
-        /** @psalm-suppress DeprecatedProperty */
-        $this->hasSequence = \method_exists($this->relay, 'getNextSequence');
     }
 
     /**
@@ -84,10 +76,7 @@ public function withCodec(CodecInterface $codec): RPCInterface
      */
     public function call(string $method, $payload, $options = null)
     {
-        /** @psalm-suppress DeprecatedMethod */
-        $seq = $this->getNextSequence();
-
-        $this->relay->send($this->packFrame($method, $payload, $seq));
+        $this->relay->send($this->packFrame($method, $payload));
 
         // wait for the frame confirmation
         $frame = $this->relay->waitFrame();
@@ -96,11 +85,11 @@ public function call(string $method, $payload, $options = null)
             throw new RPCException('Invalid RPC frame, options missing');
         }
 
-        if ($frame->options[0] !== $seq) {
+        if ($frame->options[0] !== $this->seq) {
             throw new RPCException('Invalid RPC frame, sequence mismatch');
         }
 
-        self::$seq++;
+        $this->seq++;
 
         return $this->decodeResponse($frame, $options);
     }
@@ -174,22 +163,13 @@ private function decodeResponse(Frame $frame, $options = null)
      * @param mixed $payload
      * @return Frame
      */
-    private function packFrame(string $method, $payload, int $seq): Frame
+    private function packFrame(string $method, $payload): Frame
     {
         if ($this->service !== null) {
             $method = $this->service . '.' . \ucfirst($method);
         }
 
         $body = $method . $this->codec->encode($payload);
-        return new Frame($body, [$seq, \strlen($method)], $this->codec->getIndex());
-    }
-
-    /**
-     * @deprecated since v3.2.1.
-     */
-    private function getNextSequence(): int
-    {
-        /** @psalm-suppress DeprecatedProperty */
-        return $this->hasSequence ? $this->relay->getNextSequence() : self::$seq;
+        return new Frame($body, [$this->seq, \strlen($method)], $this->codec->getIndex());
     }
 }
diff --git a/src/Relay.php b/src/Relay.php
index d05d567..ec4794d 100644
--- a/src/Relay.php
+++ b/src/Relay.php
@@ -13,8 +13,6 @@ abstract class Relay implements RelayInterface
     public const PIPES = 'pipes';
     protected const CONNECTION_EXP = '/(?P<protocol>[^:\/]+):\/\/(?P<arg1>[^:]+)(:(?P<arg2>[^:]+))?/';
 
-    private int $sequence = 1;
-
     /**
      * Create relay using string address.
      *
@@ -95,9 +93,4 @@ private static function openOut(string $output)
 
         return $resource;
     }
-
-    public function getNextSequence(): int
-    {
-        return $this->sequence++;
-    }
 }
diff --git a/src/RelayInterface.php b/src/RelayInterface.php
index c425999..209983c 100644
--- a/src/RelayInterface.php
+++ b/src/RelayInterface.php
@@ -8,14 +8,17 @@
 
 /**
  * Blocking, duplex relay.
- * @method getNextSequence(): int
  */
 interface RelayInterface
 {
     /**
+     * @return Frame
      * @throws RelayException
      */
     public function waitFrame(): Frame;
 
+    /**
+     * @param Frame $frame
+     */
     public function send(Frame $frame): void;
 }
diff --git a/tests/Goridge/RPCTest.php b/tests/Goridge/RPCTest.php
index f817837..165a397 100644
--- a/tests/Goridge/RPCTest.php
+++ b/tests/Goridge/RPCTest.php
@@ -157,7 +157,7 @@ public function testLongRawBody(): void
     {
         $conn = $this->makeRPC();
         $payload = random_bytes(65000 * 1000);
-
+        
         $resp = $conn->withCodec(new RawCodec())->call(
             'Service.EchoBinary',
             $payload