diff --git a/MongoDBCachePool.php b/MongoDBCachePool.php
index dad9c09..13e99c0 100644
--- a/MongoDBCachePool.php
+++ b/MongoDBCachePool.php
@@ -18,6 +18,7 @@
 
 /**
  * @author Tobias Nyholm <tobias.nyholm@gmail.com>
+ * @author Magnus Nordlander
  */
 class MongoDBCachePool extends AbstractCachePool
 {
@@ -34,6 +35,13 @@ public function __construct(Collection $collection)
         $this->collection = $collection;
     }
 
+    /**
+     * @param Manager $manager
+     * @param string  $database
+     * @param string  $collection
+     *
+     * @return Collection
+     */
     public static function createCollection(Manager $manager, $database, $collection)
     {
         $collection = new Collection($manager, $database, $collection);
@@ -42,23 +50,29 @@ public static function createCollection(Manager $manager, $database, $collection
         return $collection;
     }
 
+    /**
+     * {@inheritdoc}
+     */
     protected function fetchObjectFromCache($key)
     {
         $object = $this->collection->findOne(['_id' => $key]);
 
         if (!$object || !isset($object->data)) {
-            return [false, null];
+            return [false, null, []];
         }
 
         if (isset($object->expiresAt)) {
             if ($object->expiresAt < time()) {
-                return [false, null];
+                return [false, null, []];
             }
         }
 
-        return [true, unserialize($object->data)];
+        return [true, unserialize($object->data), []];
     }
 
+    /**
+     * {@inheritdoc}
+     */
     protected function clearAllObjectsFromCache()
     {
         $this->collection->deleteMany([]);
@@ -66,6 +80,9 @@ protected function clearAllObjectsFromCache()
         return true;
     }
 
+    /**
+     * {@inheritdoc}
+     */
     protected function clearOneObjectFromCache($key)
     {
         $this->collection->deleteOne(['_id' => $key]);
@@ -73,6 +90,9 @@ protected function clearOneObjectFromCache($key)
         return true;
     }
 
+    /**
+     * {@inheritdoc}
+     */
     protected function storeItemInCache(CacheItemInterface $item, $ttl)
     {
         $object = [
diff --git a/composer.json b/composer.json
index 0fdb42b..721ce45 100644
--- a/composer.json
+++ b/composer.json
@@ -26,13 +26,13 @@
     "require":           {
         "php":                  "^5.5|^7.0",
         "psr/cache":            "^1.0",
-        "cache/adapter-common": "^0.2",
-        "cache/taggable-cache": "^0.3",
+        "cache/adapter-common": "^0.3",
+        "cache/taggable-cache": "^0.4",
         "mongodb/mongodb":      "^1.0"
     },
     "require-dev":       {
         "phpunit/phpunit":         "^4.0|^5.1",
-        "cache/integration-tests": "0.9.0"
+        "cache/integration-tests": "^0.9"
     },
     "provide":           {
         "psr/cache-implementation": "^1.0"