diff --git a/src/Http/NfseClient.php b/src/Http/NfseClient.php
index 9a333f3..11ec0c0 100644
--- a/src/Http/NfseClient.php
+++ b/src/Http/NfseClient.php
@@ -80,7 +80,19 @@ public function query(string $chaveAcesso): ReceiptData
 
     public function cancel(string $chaveAcesso, string $motivo): bool
     {
-        [$httpStatus, $body] = $this->delete('/dps/' . $chaveAcesso, $motivo);
+        $eventoXml = $this->buildCancelEventXml($chaveAcesso, $motivo);
+        $signedEventoXml = $this->signer->sign($eventoXml, $this->cert->cnpj);
+
+        $compressedEventoXml = gzencode($signedEventoXml);
+
+        if ($compressedEventoXml === false) {
+            throw new NetworkException('Failed to compress cancellation event XML payload before transmission.');
+        }
+
+        [$httpStatus, $body] = $this->postEvento(
+            '/nfse/' . $chaveAcesso . '/eventos',
+            base64_encode($compressedEventoXml),
+        );
 
         if ($httpStatus >= 400) {
             throw new CancellationException(
@@ -146,12 +158,15 @@ private function get(string $path): array
     /**
      * @return array{int, array<string, mixed>}
      */
-    private function delete(string $path, string $motivo): array
+    private function postEvento(string $path, string $eventoXmlGZipB64): array
     {
-        $payload = json_encode(['motivo' => $motivo], JSON_THROW_ON_ERROR);
+        $payload = json_encode([
+            'pedidoRegistroEventoXmlGZipB64' => $eventoXmlGZipB64,
+        ], JSON_THROW_ON_ERROR);
+
         $context = stream_context_create([
             'http' => [
-                'method'        => 'DELETE',
+                'method'        => 'POST',
                 'header'        => "Content-Type: application/json\r\nAccept: application/json\r\n",
                 'content'       => $payload,
                 'ignore_errors' => true,
@@ -162,6 +177,34 @@ private function delete(string $path, string $motivo): array
         return $this->fetchAndDecode($path, $context);
     }
 
+    private function buildCancelEventXml(string $chaveAcesso, string $motivo): string
+    {
+        $doc = new \DOMDocument('1.0', 'UTF-8');
+        $doc->formatOutput = false;
+
+        $root = $doc->createElementNS('http://www.sped.fazenda.gov.br/nfse', 'pedRegEvento');
+        $root->setAttribute('versao', '1.01');
+        $doc->appendChild($root);
+
+        $infPedReg = $doc->createElement('infPedReg');
+        $infPedReg->setAttribute('Id', 'PRE' . $chaveAcesso . '101101');
+        $root->appendChild($infPedReg);
+
+        $infPedReg->appendChild($doc->createElement('tpAmb', $this->environment->sandboxMode ? '2' : '1'));
+        $infPedReg->appendChild($doc->createElement('verAplic', 'akaunting-nfse'));
+        $infPedReg->appendChild($doc->createElement('dhEvento', (new \DateTimeImmutable())->format('Y-m-d\\TH:i:sP')));
+        $infPedReg->appendChild($doc->createElement('CNPJAutor', $this->cert->cnpj));
+        $infPedReg->appendChild($doc->createElement('chNFSe', $chaveAcesso));
+
+        $e101101 = $doc->createElement('e101101');
+        $e101101->appendChild($doc->createElement('xDesc', 'Cancelamento de NFS-e'));
+        $e101101->appendChild($doc->createElement('cMotivo', '1'));
+        $e101101->appendChild($doc->createElement('xMotivo', $motivo));
+        $infPedReg->appendChild($e101101);
+
+        return $doc->saveXML($doc->documentElement) ?: '';
+    }
+
     /**
      * @return array<string, bool|string>
      */
diff --git a/tests/Unit/Http/NfseClientTest.php b/tests/Unit/Http/NfseClientTest.php
index a7aaa2f..f3437d9 100644
--- a/tests/Unit/Http/NfseClientTest.php
+++ b/tests/Unit/Http/NfseClientTest.php
@@ -136,7 +136,7 @@ public function testQueryReturnsReceiptDataOnSuccess(): void
             new Response($payload, ['Content-Type' => 'application/json'], 200)
         );
 
-        $client = $this->makeClient();
+        $client = $this->makeClient($this->signer);
 
         $receipt = $client->query('xyz-456');
 
@@ -146,13 +146,34 @@ public function testQueryReturnsReceiptDataOnSuccess(): void
     public function testCancelReturnsTrueOnSuccess(): void
     {
         self::$server->setResponseOfPath(
-            '/SefinNacional/dps/abc-123',
+            '/SefinNacional/nfse/abc-123/eventos',
             new Response('{}', ['Content-Type' => 'application/json'], 200)
         );
 
-        $client = $this->makeClient();
+        $client = $this->makeClient($this->signer);
 
         self::assertTrue($client->cancel('abc-123', 'Cancelamento a pedido do tomador'));
+
+        $request = self::$server->getLastRequest();
+        self::assertNotNull($request);
+        self::assertSame('POST', $request->getRequestMethod());
+        self::assertSame('/SefinNacional/nfse/abc-123/eventos', $request->getRequestUri());
+
+        $payload = json_decode($request->getInput(), true, 512, JSON_THROW_ON_ERROR);
+        self::assertIsArray($payload);
+        self::assertArrayHasKey('pedidoRegistroEventoXmlGZipB64', $payload);
+
+        $compressedXml = base64_decode((string) $payload['pedidoRegistroEventoXmlGZipB64'], true);
+        self::assertNotFalse($compressedXml);
+
+        $eventoXml = gzdecode($compressedXml);
+        self::assertNotFalse($eventoXml);
+        self::assertStringContainsString('<pedRegEvento', $eventoXml);
+        self::assertStringContainsString('<chNFSe>abc-123</chNFSe>', $eventoXml);
+        self::assertStringContainsString('<e101101>', $eventoXml);
+        self::assertStringContainsString('<xDesc>Cancelamento de NFS-e</xDesc>', $eventoXml);
+        self::assertStringContainsString('<cMotivo>1</cMotivo>', $eventoXml);
+        self::assertStringContainsString('<xMotivo>Cancelamento a pedido do tomador</xMotivo>', $eventoXml);
     }
 
     // -------------------------------------------------------------------------
@@ -202,7 +223,7 @@ public function testQueryThrowsQueryExceptionWhenGatewayReturnsError(): void
             new Response('{"error":"not found"}', ['Content-Type' => 'application/json'], 404),
         );
 
-        $client = $this->makeClient();
+        $client = $this->makeClient($this->signer);
 
         $this->expectException(QueryException::class);
         $client->query('missing-key');
@@ -215,7 +236,7 @@ public function testQueryExceptionCarriesErrorCodeAndHttpStatus(): void
             new Response('{"error":"not found"}', ['Content-Type' => 'application/json'], 404),
         );
 
-        $client = $this->makeClient();
+        $client = $this->makeClient($this->signer);
 
         try {
             $client->query('missing-key');
@@ -229,11 +250,11 @@ public function testQueryExceptionCarriesErrorCodeAndHttpStatus(): void
     public function testCancelThrowsCancellationExceptionWhenGatewayReturnsError(): void
     {
         self::$server->setResponseOfPath(
-            '/SefinNacional/dps/blocked-key',
+            '/SefinNacional/nfse/blocked-key/eventos',
             new Response('{"error":"cannot cancel"}', ['Content-Type' => 'application/json'], 409),
         );
 
-        $client = $this->makeClient();
+        $client = $this->makeClient($this->signer);
 
         $this->expectException(CancellationException::class);
         $client->cancel('blocked-key', 'a pedido do tomador');
@@ -242,11 +263,11 @@ public function testCancelThrowsCancellationExceptionWhenGatewayReturnsError():
     public function testCancellationExceptionCarriesErrorCodeAndHttpStatus(): void
     {
         self::$server->setResponseOfPath(
-            '/SefinNacional/dps/blocked-key',
+            '/SefinNacional/nfse/blocked-key/eventos',
             new Response('{"error":"cannot cancel"}', ['Content-Type' => 'application/json'], 409),
         );
 
-        $client = $this->makeClient();
+        $client = $this->makeClient($this->signer);
 
         try {
             $client->cancel('blocked-key', 'a pedido do tomador');