diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 2d7c9cd..804faa0 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -20,7 +20,7 @@ jobs:
         uses: shivammathur/setup-php@v2
         with:
           php-version: ${{ matrix.php-version }}
-          tools: composer:v1
+          tools: composer:v2
       - name: Composer cache
         uses: actions/cache@v4
         with:
diff --git a/src/Bot/Model/Request/MessageSendRequest.php b/src/Bot/Model/Request/MessageSendRequest.php
index 26c6bdc..0a07f8f 100644
--- a/src/Bot/Model/Request/MessageSendRequest.php
+++ b/src/Bot/Model/Request/MessageSendRequest.php
@@ -101,6 +101,15 @@ class MessageSendRequest implements ModelInterface
      */
     private $transportAttachments;
 
+    /**
+     * @var bool $massCommunication
+     *
+     * @Type("bool")
+     * @Accessor(getter="getMassCommunication",setter="setMassCommunication")
+     * @Serializer\SerializedName("mass_communication")
+     */
+    private $massCommunication;
+
     /**
      * @var int $chatId
      *
@@ -170,6 +179,22 @@ public function setTransportAttachments(TransportAttachments $transportAttachmen
         $this->transportAttachments = $transportAttachments;
     }
 
+    /**
+     * @return bool|null
+     */
+    public function getMassCommunication(): ?bool
+    {
+        return $this->massCommunication;
+    }
+
+    /**
+     * @param bool|null $massCommunication
+     */
+    public function setMassCommunication(?bool $massCommunication): void
+    {
+        $this->massCommunication = $massCommunication;
+    }
+
     /**
      * @return string
      */
diff --git a/tests/Bot/Tests/Model/MessageSendRequestTest.php b/tests/Bot/Tests/Model/MessageSendRequestTest.php
new file mode 100644
index 0000000..565b321
--- /dev/null
+++ b/tests/Bot/Tests/Model/MessageSendRequestTest.php
@@ -0,0 +1,32 @@
+<?php
+
+namespace RetailCrm\Mg\Bot\Tests\Model;
+
+use PHPUnit\Framework\TestCase;
+use RetailCrm\Common\Serializer;
+use RetailCrm\Mg\Bot\Model\Request\MessageSendRequest;
+
+class MessageSendRequestTest extends TestCase
+{
+    /**
+     * @dataProvider dataProvider_massCommunication
+     * @param bool $value
+     */
+    public function testSerialization_MassCommunication(bool $value): void
+    {
+        $request = new MessageSendRequest();
+        $request->setMassCommunication($value);
+
+        $result = Serializer::serialize($request, Serializer::S_ARRAY);
+
+        self::assertEquals(['mass_communication' => $value], $result);
+    }
+
+    public function dataProvider_massCommunication(): array
+    {
+        return [
+            [true],
+            [false],
+        ];
+    }
+}
\ No newline at end of file