diff --git a/src/Codeception/Module/Yii2.php b/src/Codeception/Module/Yii2.php
index 768c69a..0da51e5 100644
--- a/src/Codeception/Module/Yii2.php
+++ b/src/Codeception/Module/Yii2.php
@@ -13,14 +13,11 @@
 use Codeception\Lib\Connector\Yii2\TransactionForcer;
 use Codeception\Lib\Framework;
 use Codeception\Lib\Interfaces\ActiveRecord;
-use Codeception\Lib\Interfaces\MultiSession;
 use Codeception\Lib\Interfaces\PartedModule;
 use Codeception\TestInterface;
 use PHPUnit\Framework\Assert;
 use ReflectionClass;
 use RuntimeException;
-use Symfony\Component\BrowserKit\CookieJar;
-use Symfony\Component\BrowserKit\History;
 use Yii;
 use yii\base\Security;
 use yii\db\ActiveQueryInterface;
@@ -29,7 +26,6 @@
 use yii\mail\BaseMessage;
 use yii\mail\MessageInterface;
 use yii\test\Fixture;
-use yii\web\Application as WebApplication;
 use yii\web\IdentityInterface;
 
 /**
@@ -207,7 +203,6 @@
  *       closeSessionOnRecreateApplication: bool,
  *       applicationClass: class-string<\yii\base\Application>|null
  *   }
- * @phpstan-type SessionBackup array{cookie: array<mixed>, session: array<mixed>, headers: array<string, string>, clientContext: array{ cookieJar: CookieJar, history: History }}
  * @phpstan-type ClientConfig array{
  *       configFile: string,
  *       responseCleanMethod: Yii2Connector::CLEAN_CLEAR|Yii2Connector::CLEAN_MANUAL|Yii2Connector::CLEAN_RECREATE,
@@ -218,7 +213,7 @@
  *       applicationClass: class-string<\yii\base\Application>|null
  *   }
  */
-final class Yii2 extends Framework implements ActiveRecord, MultiSession, PartedModule
+final class Yii2 extends Framework implements ActiveRecord, PartedModule
 {
     /**
      * @var list<Yii2Connector\FixturesStore>
@@ -886,64 +881,4 @@ public function _afterSuite(): void
 
         $_SERVER = $this->server;
     }
-
-    /**
-     * Initialize an empty session. Implements MultiSession.
-     */
-    public function _initializeSession(): void
-    {
-        $this->getClient()->restart();
-        $this->headers = [];
-        $_SESSION = [];
-        $_COOKIE = [];
-    }
-
-    /**
-     * Return the session content for future restoring. Implements MultiSession.
-     *
-     * @return SessionBackup
-     */
-    public function _backupSession(): array
-    {
-        if (Yii::$app instanceof WebApplication && Yii::$app->has('session', true) && Yii::$app->session->useCustomStorage) {
-            throw new ModuleException($this, "Yii2 MultiSession only supports the default session backend.");
-        }
-        return [
-            'clientContext' => $this->getClient()->getContext(),
-            'headers' => $this->headers,
-            // @phpstan-ignore nullCoalesce.variable
-            'cookie' => $_COOKIE ?? [],
-            'session' => $_SESSION ?? [],
-        ];
-    }
-
-    /**
-     * Restore a session. Implements MultiSession.
-     *
-     * @param SessionBackup $session output of _backupSession()
-     */
-    public function _loadSession($session): void
-    {
-        $this->getClient()->setContext($session['clientContext']);
-        $this->headers = $session['headers'];
-        $_SESSION = $session['session'];
-        $_COOKIE = $session['cookie'];
-        $app = Yii::$app;
-        if ($app?->has('user', true)) {
-            $definitions = $app->getComponents();
-            $app->set('user', $definitions['user']);
-        }
-    }
-
-    /**
-     * Close and dump a session. Implements MultiSession.
-     *
-     * @param mixed $session
-     */
-    public function _closeSession($session = null): void
-    {
-        if (! $session) {
-            $this->_initializeSession();
-        }
-    }
 }