diff --git a/.travis.yml b/.travis.yml
index e61f55d..e2854b3 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,8 +1,8 @@
 language: php
 
 php:
-  - 7.0
   - 7.1
+  - 7.2
 
 # faster builds on new travis setup not using sudo
 sudo: false
diff --git a/composer.json b/composer.json
index 2f2d89e..d10a63e 100644
--- a/composer.json
+++ b/composer.json
@@ -14,18 +14,26 @@
         }
     ],
     "require": {
-        "php": ">=7.0.0",
-        "yiisoft/yii2": "*"
+        "php": ">=7.1.0",
+        "yiisoft/yii2": "~2.0.10"
     },
     "require-dev": {
         "friendsofphp/php-cs-fixer": "~2.0",
-        "phpunit/phpunit": "~6.0"
+        "phpunit/phpunit": "^7.3"
     },
     "autoload": {
         "psr-4": {
             "yii2mod\\cart\\": ""
         }
     },
+    "scripts": {
+        "phpcs": "php-cs-fixer fix -v --diff --dry-run --allow-risky=yes;",
+        "phpunit": "phpunit --coverage-text",
+        "test": [
+            "@phpunit",
+            "@phpcs"
+        ]
+    },
     "repositories": [
         {
             "type": "composer",
diff --git a/storage/DatabaseStorage.php b/storage/DatabaseStorage.php
index d1a7e26..df7d9c3 100755
--- a/storage/DatabaseStorage.php
+++ b/storage/DatabaseStorage.php
@@ -3,8 +3,8 @@
 namespace yii2mod\cart\storage;
 
 use Yii;
+use yii\base\BaseObject;
 use yii\base\InvalidConfigException;
-use yii\base\Object;
 use yii\db\Connection;
 use yii\db\Query;
 use yii\web\User;
@@ -18,7 +18,7 @@
  *
  * @package yii2mod\cart\storage
  */
-class DatabaseStorage extends Object implements StorageInterface
+class DatabaseStorage extends BaseObject implements StorageInterface
 {
     /**
      * @var string Name of the user component
diff --git a/tests/TestCase.php b/tests/TestCase.php
index aef26e3..7cd571d 100644
--- a/tests/TestCase.php
+++ b/tests/TestCase.php
@@ -4,6 +4,7 @@
 
 use Yii;
 use yii\helpers\ArrayHelper;
+use yii2mod\cart\tests\data\Session;
 
 /**
  * This is the base class for all yii framework unit tests.
@@ -43,7 +44,7 @@ protected function mockApplication($config = [], $appClass = '\yii\console\Appli
                     'dsn' => 'sqlite::memory:',
                 ],
                 'session' => [
-                    'class' => 'yii\web\DbSession',
+                    'class' => Session::class,
                 ],
                 'cart' => [
                     'class' => 'yii2mod\cart\Cart',
diff --git a/tests/data/Session.php b/tests/data/Session.php
new file mode 100644
index 0000000..c7514f4
--- /dev/null
+++ b/tests/data/Session.php
@@ -0,0 +1,22 @@
+<?php
+
+namespace yii2mod\cart\tests\data;
+
+class Session extends \yii\web\Session
+{
+    /**
+     * @inheritdoc
+     */
+    public function init()
+    {
+        // blank, override, preventing shutdown function registration
+    }
+
+    /**
+     * @inheritdoc
+     */
+    public function open()
+    {
+        // blank, override, preventing session start
+    }
+}