diff --git a/.travis.yml b/.travis.yml
index b566097..ae3b105 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,12 +1,13 @@
 language: php
 php:
-  - 5.4
   - 5.5
   - 5.6
+  - 7.0
 services:
   - redis-server
 before_script:
-  - pecl config-set preferred_state beta; printf "yes\n" | pecl install apcu ;
+  - if [[ $TRAVIS_PHP_VERSION =~ 5.[56] ]] ; then echo yes | pecl install apcu-4.0.10; fi;
+  - if [[ $TRAVIS_PHP_VERSION = 7.* ]] ; then pecl config-set preferred_state beta; echo yes | pecl install apcu; fi;
   - phpenv config-add tests/php.ini
   - composer install
 script: cd tests && phpunit --configuration phpunit.xml --coverage-text ./
diff --git a/composer.json b/composer.json
index b89f194..ef20bec 100644
--- a/composer.json
+++ b/composer.json
@@ -4,6 +4,7 @@
     "description": "Rate Limiting Library With Token Bucket Algorithm",
     "version": "1.1.0",
     "require": {
+        "php": ">=5.5"
     },
     "require-dev": {
         "phpunit/phpunit": "^4.6.6"
diff --git a/src/Adapter/APCu.php b/src/Adapter/APCu.php
new file mode 100644
index 0000000..02d3252
--- /dev/null
+++ b/src/Adapter/APCu.php
@@ -0,0 +1,31 @@
+<?php
+
+namespace Touhonoob\RateLimit\Adapter;
+
+/**
+ * @author Peter Chung <touhonoob@gmail.com>
+ * @date June 7, 2016
+ */
+class APCu extends \Touhonoob\RateLimit\Adapter
+{
+
+    public function set($key, $value, $ttl)
+    {
+        return apcu_store($key, $value, $ttl);
+    }
+
+    public function get($key)
+    {
+        return apcu_fetch($key);
+    }
+
+    public function exists($key)
+    {
+        return apcu_exists($key);
+    }
+
+    public function del($key)
+    {
+        return apcu_delete($key);
+    }
+}
diff --git a/tests/RateLimitTest.php b/tests/RateLimitTest.php
index 259f3b4..6f87ccb 100644
--- a/tests/RateLimitTest.php
+++ b/tests/RateLimitTest.php
@@ -16,17 +16,27 @@ class RateLimitTest extends \PHPUnit_Framework_TestCase
     const MAX_REQUESTS = 10;
     const PERIOD = 3;
 
-    public function tearDown()
+    /**
+     * @requires extension apc
+     */
+    public function testCheckAPC()
     {
-        
+        $adapter = new \Touhonoob\RateLimit\Adapter\APC();
+        $this->check($adapter);
     }
 
-    public function testCheckAPC()
+    /**
+     * @requires extension apcu
+     */
+    public function testCheckAPCu()
     {
-        $adapter = new \Touhonoob\RateLimit\Adapter\APC();
+        $adapter = new \Touhonoob\RateLimit\Adapter\APCu();
         $this->check($adapter);
     }
 
+    /**
+     * @requires extension redis
+     */ 
     public function testCheckRedis()
     {
         $adapter = new \Touhonoob\RateLimit\Adapter\Redis();