diff --git a/.travis.yml b/.travis.yml
index ba86bfb..358442d 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,11 +1,10 @@
 language: php
 
 php:
-  - '5.4'
-  - '5.5'
-  - '5.6'
   - '7.0'
   - '7.1'
+  - '7.2'
+  - '7.3'
 
 services:
   - redis-server
@@ -13,7 +12,6 @@ services:
 before_install: v=$(phpenv version-name); if [ ${v:0:1} -lt 7 ]; then pecl install igbinary ; yes | pecl install redis; else echo "extension = redis.so" >> ~/.phpenv/versions/$(phpenv version-name)/etc/php.ini; fi
 
 install:
-  - composer global require --prefer-dist "fxp/composer-asset-plugin:^1.2.0"
   - composer require codeclimate/php-test-reporter --dev --prefer-dist
   - composer install --no-progress --no-interaction --prefer-dist
 
diff --git a/README.md b/README.md
index 2890ecf..d8356ba 100644
--- a/README.md
+++ b/README.md
@@ -4,25 +4,10 @@ This extension provides the [redis](http://redis.io/) key-value store support fo
 
 It includes a `Cache` and `Session` storage handler in redis.
 
-
-[![Build Status](https://travis-ci.org/dcb9/yii2-phpredis.svg?branch=master)](https://travis-ci.org/dcb9/yii2-phpredis)
-[![Code Climate](https://codeclimate.com/github/dcb9/yii2-phpredis/badges/gpa.svg)](https://codeclimate.com/github/dcb9/yii2-phpredis)
-[![Test Coverage](https://codeclimate.com/github/dcb9/yii2-phpredis/badges/coverage.svg)](https://codeclimate.com/github/dcb9/yii2-phpredis/coverage)
-[![Issue Count](https://codeclimate.com/github/dcb9/yii2-phpredis/badges/issue_count.svg)](https://codeclimate.com/github/dcb9/yii2-phpredis)
-[![Latest Stable Version](https://poser.pugx.org/dcb9/yii2-phpredis/version)](https://packagist.org/packages/dcb9/yii2-phpredis)
-[![Total Downloads](https://poser.pugx.org/dcb9/yii2-phpredis/downloads)](https://packagist.org/packages/dcb9/yii2-phpredis)
-[![License](https://poser.pugx.org/dcb9/yii2-phpredis/license)](https://packagist.org/packages/dcb9/yii2-phpredis)
+[![Build Status](https://travis-ci.org/nuwber/yii2-phpredis.svg?branch=master)](https://travis-ci.org/nuwber/yii2-phpredis)
 
 **Notice: THIS REPO DOES NOT SUPPORT ACTIVE RECORD.**
 
-Requirements
-------------
-
-- PHP >= 5.4.0 
-- Redis >= 2.6.12
-- ext-redis >= 2.2.7
-- Yii2 ~2.0.4
-
 Installation
 ------------
 
@@ -50,15 +35,20 @@ To use this extension, you have to configure the Connection class in your applic
 
 ```php
 return [
-    //....
     'components' => [
         'redis' => [
-            'class' => 'dcb9\redis\Connection',
+            'class' => \dcb9\redis\Connection::class,
             'hostname' => 'localhost',
             'port' => 6379,
             'database' => 0,
         ],
-    ]
+        'cache' => [
+            'class' => \dcb9\redis\Cache::class,
+        ],
+        'session' => [
+            'class' => \dcb9\redis\Session::class,
+        ],
+    ],
 ];
 ```
 
@@ -67,22 +57,14 @@ Run unit test
 
 You can specific your redis config
 
-```
+```bash
 $ cp tests/config.php tests/config-local.php
-$ vim tests/config-local.php
 ```
 
 and Run
 
-```
+```bash
 $ ./vendor/bin/phpunit
-PHPUnit 5.6.1 by Sebastian Bergmann and contributors.
-
-............                           12 / 12 (100%)
-
-Time: 600 ms, Memory: 10.00MB
-
-OK (12 tests, 50 assertions)
 ```
 
 Performance test
diff --git a/composer.json b/composer.json
index 4895ae3..013cdda 100644
--- a/composer.json
+++ b/composer.json
@@ -10,25 +10,25 @@
     }
   ],
   "require": {
-    "yiisoft/yii2": "~2.0.4",
-    "ext-redis": ">=2.2.7",
-    "php": ">=5.4.0"
+    "ext-json": "*",
+    "yiisoft/yii2": "~2.0.14",
+    "ext-redis": ">=3",
+    "php": ">=7.0"
   },
   "autoload": {
     "psr-4": {
-      "dcb9\\redis\\": ""
+      "dcb9\\redis\\": "src/",
+      "dcb9\\redis\\tests\\": "tests/"
     }
   },
   "require-dev": {
     "phpunit/phpunit": "<6.0",
     "yiisoft/yii2-redis": "^2.0"
   },
-  "config": {
-    "fxp-asset": {
-      "vcs-driver-options": {
-      "github-no-api": true
-    },
-    "pattern-skip-version": "(-build|-patch)"
+  "repositories": [
+    {
+      "type": "composer",
+      "url": "https://asset-packagist.org"
     }
-  }
+  ]
 }
diff --git a/phpredis-vs-yii-redis.png b/phpredis-vs-yii-redis.png
index d977632..b1594f4 100644
Binary files a/phpredis-vs-yii-redis.png and b/phpredis-vs-yii-redis.png differ
diff --git a/Cache.php b/src/Cache.php
similarity index 99%
rename from Cache.php
rename to src/Cache.php
index 725c9ee..452ff7f 100644
--- a/Cache.php
+++ b/src/Cache.php
@@ -23,11 +23,10 @@ class Cache extends \yii\caching\Cache
     public function init()
     {
         parent::init();
-        $this->redis = Instance::ensure($this->redis, Connection::className());
+        $this->redis = Instance::ensure($this->redis, Connection::class);
         $this->redis->open();
     }
 
-
     /**
      * @inheritdoc
      */
diff --git a/Connection.php b/src/Connection.php
similarity index 93%
rename from Connection.php
rename to src/Connection.php
index 040009b..634a686 100644
--- a/Connection.php
+++ b/src/Connection.php
@@ -64,15 +64,6 @@ public function __construct($config = [])
         }
     }
 
-    /**
-     * Returns the fully qualified name of this class.
-     * @return string the fully qualified name of this class.
-     */
-    public static function className()
-    {
-        return get_called_class();
-    }
-
     /**
      * Establishes a DB connection.
      * It does nothing if a DB connection has already been established.
@@ -123,7 +114,7 @@ public function ping()
         return parent::ping() === '+PONG';
     }
 
-    public function flushdb()
+    public function flushdb($async = null)
     {
         return parent::flushDB();
     }
diff --git a/Session.php b/src/Session.php
similarity index 98%
rename from Session.php
rename to src/Session.php
index 5425b61..b82abca 100644
--- a/Session.php
+++ b/src/Session.php
@@ -77,7 +77,7 @@ public function init()
             $this->redis = Yii::$app->get($this->redis);
         } elseif (is_array($this->redis)) {
             if (!isset($this->redis['class'])) {
-                $this->redis['class'] = Connection::className();
+                $this->redis['class'] = Connection::class;
             }
             $this->redis = Yii::createObject($this->redis);
         }
diff --git a/tests/CacheTest.php b/tests/CacheTest.php
index 1b8c156..ae981bd 100644
--- a/tests/CacheTest.php
+++ b/tests/CacheTest.php
@@ -97,7 +97,7 @@ public function testMultiSet()
         $this->assertEquals('v1', $cache->get('k1'));
         $this->assertEquals('v2', $cache->get('k2'));
         $this->assertEquals('v3', $cache->get('k3'));
-        sleep(1);
+        usleep(1100000);
         $this->assertFalse($cache->get('k1'));
         $this->assertFalse($cache->get('k2'));
         $this->assertFalse($cache->get('k3'));
@@ -107,7 +107,6 @@ public function testMultiSet()
         $this->assertFalse($cache->exists('k3'));
 
         $cache->multiSet($items);
-        sleep(2);
         $this->assertEquals('v1', $cache->get('k1'));
         $this->assertEquals('v2', $cache->get('k2'));
         $this->assertEquals('v3', $cache->get('k3'));
@@ -118,7 +117,7 @@ public function testSetGet()
         $cache = $this->getCacheInstance();
         $cache->set('key', 'val', 1);
         $this->assertEquals('val', $cache->get('key'));
-        sleep(1);
+        usleep(1100000);
         $this->assertFalse($cache->get('key'));
         $this->assertFalse($cache->exists('key'));
 
@@ -150,7 +149,7 @@ public function testMultiAdd()
             'k1' => 'v1',
         ], 1));
         $this->assertEquals('vv55', $cache->get('k5'));
-        sleep(1);
+        usleep(1100000);
         $this->assertFalse($cache->exists('k5'));
         $this->assertTrue($cache->exists('k1'));
     }
diff --git a/tests/SessionTest.php b/tests/SessionTest.php
index 237f641..413e4f6 100644
--- a/tests/SessionTest.php
+++ b/tests/SessionTest.php
@@ -2,30 +2,32 @@
 
 namespace dcb9\redis\tests;
 
-use dcb9\redis\Connection;
 use Yii;
+use dcb9\redis\Connection;
+use dcb9\redis\Session;
 
 class SessionTest extends TestCase
 {
     public function testSession()
     {
-        $params = self::getParam();
-        $params['class'] = Connection::className();
         $this->mockApplication([
             'components' => [
-                'redis' => $params,
-                'session' => 'dcb9\\redis\\Session',
+                'redis' => array_merge(self::getParam(), [
+                    'class' => Connection::class,
+                ]),
+                'session' => Session::class,
             ]
         ]);
 
         $sessionId = 'sessionId';
         $session = Yii::$app->session;
-        $session->setTimeout(1);
         $sessionData = json_encode([
             'sessionId' => $sessionId,
             'username' => 'bob',
         ]);
+
         $session->writeSession($sessionId, $sessionData);
+
         $this->assertEquals($sessionData, $session->readSession($sessionId));
         $this->assertTrue($session->destroySession($sessionId));
         $this->assertEquals('', $session->readSession($sessionId));
diff --git a/tests/performance.php b/tests/performance.php
index 02b3c79..f8a69fd 100644
--- a/tests/performance.php
+++ b/tests/performance.php
@@ -56,3 +56,17 @@
     $yiiRedis->get('yii_redis_prefix' . $i);
 }
 echo " " . ((microtime(true) - $start) * 1000) . " micro seconds.\n";
+
+echo "phpredis run DEL $count times in";
+$start = microtime(true);
+for ($i = 0; $i < $count; $i++) {
+    $phpRedis->del('php_redis_prefix' . $i);
+}
+echo " " . ((microtime(true) - $start) * 1000) . " micro seconds.\n";
+
+echo "yii redis run DEL $count times in";
+$start = microtime(true);
+for ($i = 0; $i < $count; $i++) {
+    $yiiRedis->del('yii_redis_prefix' . $i);
+}
+echo " " . ((microtime(true) - $start) * 1000) . " micro seconds.\n";