diff --git a/api/controllers/AccountsController.php b/api/controllers/AccountsController.php
index 299d976..71ef948 100644
--- a/api/controllers/AccountsController.php
+++ b/api/controllers/AccountsController.php
@@ -4,6 +4,7 @@ namespace api\controllers;
 use api\models\profile\ChangeEmail\ConfirmNewEmailForm;
 use api\models\profile\ChangeEmail\InitStateForm;
 use api\models\profile\ChangeEmail\NewEmailForm;
+use api\models\profile\ChangeLanguageForm;
 use api\models\profile\ChangePasswordForm;
 use api\models\profile\ChangeUsernameForm;
 use common\models\Account;
@@ -30,6 +31,7 @@ class AccountsController extends Controller {
                             'change-email-initialize',
                             'change-email-submit-new-email',
                             'change-email-confirm-new-email',
+                            'change-lang',
                         ],
                         'allow' => true,
                         'roles' => ['@'],
@@ -52,6 +54,7 @@ class AccountsController extends Controller {
             'change-email-initialize' => ['POST'],
             'change-email-submit-new-email' => ['POST'],
             'change-email-confirm-new-email' => ['POST'],
+            'change-lang' => ['POST'],
         ];
     }
 
@@ -157,4 +160,21 @@ class AccountsController extends Controller {
         ];
     }
 
+    public function actionChangeLang() {
+        /** @var Account $account */
+        $account = Yii::$app->user->identity;
+        $model = new ChangeLanguageForm($account);
+        $model->load(Yii::$app->request->post());
+        if (!$model->applyLanguage()) {
+            return [
+                'success' => false,
+                'errors' => $this->normalizeModelErrors($model->getErrors()),
+            ];
+        }
+
+        return [
+            'success' => true,
+        ];
+    }
+
 }
diff --git a/api/models/profile/ChangeLanguageForm.php b/api/models/profile/ChangeLanguageForm.php
new file mode 100644
index 0000000..fa44d26
--- /dev/null
+++ b/api/models/profile/ChangeLanguageForm.php
@@ -0,0 +1,45 @@
+<?php
+namespace api\models\profile;
+
+use api\models\base\ApiForm;
+use common\models\Account;
+use common\validators\LanguageValidator;
+use yii\base\ErrorException;
+
+class ChangeLanguageForm extends ApiForm {
+
+    public $lang;
+
+    private $account;
+
+    public function __construct(Account $account, array $config = []) {
+        $this->account = $account;
+        parent::__construct($config);
+    }
+
+    public function rules() {
+        return [
+            ['lang', 'required'],
+            ['lang', LanguageValidator::class],
+        ];
+    }
+
+    public function applyLanguage() : bool {
+        if (!$this->validate()) {
+            return false;
+        }
+
+        $account = $this->getAccount();
+        $account->lang = $this->lang;
+        if (!$account->save()) {
+            throw new ErrorException('Cannot change user language');
+        }
+
+        return true;
+    }
+
+    public function getAccount() : Account {
+        return $this->account;
+    }
+
+}
diff --git a/tests/codeception/api/_pages/AccountsRoute.php b/tests/codeception/api/_pages/AccountsRoute.php
index 2e8232e..2f1bc05 100644
--- a/tests/codeception/api/_pages/AccountsRoute.php
+++ b/tests/codeception/api/_pages/AccountsRoute.php
@@ -50,4 +50,11 @@ class AccountsRoute extends BasePage {
         ]);
     }
 
+    public function changeLang($lang = null) {
+        $this->route = ['accounts/change-lang'];
+        $this->actor->sendPOST($this->getUrl(), [
+            'lang' => $lang,
+        ]);
+    }
+
 }
diff --git a/tests/codeception/api/functional/AccountsChangeLangCest.php b/tests/codeception/api/functional/AccountsChangeLangCest.php
new file mode 100644
index 0000000..4fc16fb
--- /dev/null
+++ b/tests/codeception/api/functional/AccountsChangeLangCest.php
@@ -0,0 +1,31 @@
+<?php
+namespace tests\codeception\api\functional;
+
+use Codeception\Specify;
+use tests\codeception\api\_pages\AccountsRoute;
+use tests\codeception\api\FunctionalTester;
+
+class AccountsChangeLangCest {
+
+    /**
+     * @var AccountsRoute
+     */
+    private $route;
+
+    public function _before(FunctionalTester $I) {
+        $this->route = new AccountsRoute($I);
+    }
+
+    public function testSubmitNewEmail(FunctionalTester $I) {
+        $I->wantTo('change my account language');
+        $I->loggedInAsActiveAccount();
+
+        $this->route->changeLang('ru');
+        $I->canSeeResponseCodeIs(200);
+        $I->canSeeResponseIsJson();
+        $I->canSeeResponseContainsJson([
+            'success' => true,
+        ]);
+    }
+
+}
diff --git a/tests/codeception/api/unit/models/profile/ChangeLanguageFormTest.php b/tests/codeception/api/unit/models/profile/ChangeLanguageFormTest.php
new file mode 100644
index 0000000..eaa09c2
--- /dev/null
+++ b/tests/codeception/api/unit/models/profile/ChangeLanguageFormTest.php
@@ -0,0 +1,36 @@
+<?php
+namespace codeception\api\unit\models\profile;
+
+use api\models\profile\ChangeLanguageForm;
+use Codeception\Specify;
+use common\models\Account;
+use tests\codeception\api\unit\DbTestCase;
+use tests\codeception\common\fixtures\AccountFixture;
+
+/**
+ * @property AccountFixture $accounts
+ */
+class ChangeLanguageFormTest extends DbTestCase {
+    use Specify;
+
+    public function fixtures() {
+        return [
+            'accounts' => [
+                'class' => AccountFixture::class,
+                'dataFile' => '@tests/codeception/common/fixtures/data/accounts.php',
+            ],
+        ];
+    }
+
+    public function testApplyLanguage() {
+        $this->specify('language changed', function() {
+            /** @var Account $account */
+            $account = Account::findOne($this->accounts['admin']);
+            $model = new ChangeLanguageForm($account);
+            $model->lang = 'ru';
+            expect($model->applyLanguage())->true();
+            expect($account->lang)->equals('ru');
+        });
+    }
+
+}