diff --git a/composer.json b/composer.json
index 9624f06..862b0db 100644
--- a/composer.json
+++ b/composer.json
@@ -38,7 +38,7 @@
         "yiisoft/yii2-faker": "*",
         "flow/jsonpath": "^0.3.1",
         "phpunit/phpunit": "^5.7",
-        "codeception/codeception": "~2.3",
+        "codeception/codeception": "2.3.4",
         "codeception/specify": "*",
         "codeception/verify": "*",
         "phploc/phploc": "^3.0.1",
diff --git a/tests/codeception/api/functional.suite.yml b/tests/codeception/api/functional.suite.yml
index 3dd11ab..2c726d3 100644
--- a/tests/codeception/api/functional.suite.yml
+++ b/tests/codeception/api/functional.suite.yml
@@ -13,6 +13,7 @@ modules:
         Yii2:
             configFile: '../config/api/functional.php'
             cleanup: true
+            transaction: false
         Redis:
             host: "%REDIS_HOST%"
             port: 6379
diff --git a/tests/codeception/api/unit.suite.yml b/tests/codeception/api/unit.suite.yml
index ddf9713..ccb1862 100644
--- a/tests/codeception/api/unit.suite.yml
+++ b/tests/codeception/api/unit.suite.yml
@@ -9,3 +9,4 @@ modules:
         Yii2:
             configFile: '../config/api/unit.php'
             cleanup: true
+            transaction: false
diff --git a/tests/codeception/api/unit/models/authentication/RegistrationFormTest.php b/tests/codeception/api/unit/models/authentication/RegistrationFormTest.php
index d3e7c57..2db914f 100644
--- a/tests/codeception/api/unit/models/authentication/RegistrationFormTest.php
+++ b/tests/codeception/api/unit/models/authentication/RegistrationFormTest.php
@@ -10,6 +10,8 @@ use common\models\UsernameHistory;
 use GuzzleHttp\ClientInterface;
 use tests\codeception\api\unit\TestCase;
 use tests\codeception\common\fixtures\AccountFixture;
+use tests\codeception\common\fixtures\EmailActivationFixture;
+use tests\codeception\common\fixtures\UsernameHistoryFixture;
 use Yii;
 use yii\web\Request;
 use const common\LATEST_RULES_VERSION;
@@ -30,6 +32,8 @@ class RegistrationFormTest extends TestCase {
     public function _fixtures() {
         return [
             'accounts' => AccountFixture::class,
+            'emailActivations' => EmailActivationFixture::class,
+            'usernameHistory' => UsernameHistoryFixture::class,
         ];
     }
 
diff --git a/tests/codeception/common/unit.suite.yml b/tests/codeception/common/unit.suite.yml
index 74f9d6a..11d4bb4 100644
--- a/tests/codeception/common/unit.suite.yml
+++ b/tests/codeception/common/unit.suite.yml
@@ -8,3 +8,4 @@ modules:
         Yii2:
             configFile: '../config/common/unit.php'
             cleanup: true
+            transaction: false
diff --git a/tests/codeception/console/unit.suite.yml b/tests/codeception/console/unit.suite.yml
index 110e551..baa5a80 100644
--- a/tests/codeception/console/unit.suite.yml
+++ b/tests/codeception/console/unit.suite.yml
@@ -8,3 +8,4 @@ modules:
         Yii2:
             configFile: '../config/console/unit.php'
             cleanup: true
+            transaction: false