diff --git a/common/oatbox/filesystem/FileSystem.php b/common/oatbox/filesystem/FileSystem.php
index 85dde8a3e..71927f6fa 100644
--- a/common/oatbox/filesystem/FileSystem.php
+++ b/common/oatbox/filesystem/FileSystem.php
@@ -82,7 +82,7 @@ protected function getFileSystem()
      *
      * @return FilesystemAdapter adapter
      */
-    private function getAdapter()
+    public function getAdapter()
     {
         return $this->getFileSystem()->getAdapter();
     }
diff --git a/common/oatbox/filesystem/utils/FlyWrapperTrait.php b/common/oatbox/filesystem/utils/FlyWrapperTrait.php
index 5f54eb8e9..caf7a3498 100644
--- a/common/oatbox/filesystem/utils/FlyWrapperTrait.php
+++ b/common/oatbox/filesystem/utils/FlyWrapperTrait.php
@@ -36,7 +36,7 @@ public function writeStream($path, $resource, Config $config)
 
     /**
      * (non-PHPdoc)
-     * @see \League\Flysystem\FilesystemAdapter::update()
+     * @see \League\Flysystem\FilesystemAdapter::write()
      */
     public function update($path, $contents, Config $config)
     {
@@ -47,7 +47,7 @@ public function update($path, $contents, Config $config)
 
     /**
      * (non-PHPdoc)
-     * @see \League\Flysystem\FilesystemAdapter::updateStream()
+     * @see \League\Flysystem\FilesystemAdapter::writeStream()
      */
     public function updateStream($path, $resource, Config $config)
     {
diff --git a/composer.json b/composer.json
index ec7e78591..bab286647 100755
--- a/composer.json
+++ b/composer.json
@@ -59,8 +59,9 @@
     "doctrine/dbal": "^2.12",
     "doctrine/annotations": "^1.13",
     "laminas/laminas-servicemanager": "~2.5.0",
-    "league/flysystem": "~1.0",
-    "league/flysystem-memory": "~1.0",
+    "league/flysystem": "^2.0",
+    "league/flysystem-memory": "^2.0",
+    "league/flysystem-google-cloud-storage": "^2.0",
     "oat-sa/oatbox-extension-installer": "~1.1||dev-master",
     "oat-sa/lib-generis-search": "^2.3.0",
     "monolog/monolog": "^1.23.0",
@@ -86,7 +87,7 @@
     "php-mock/php-mock": "^2.0"
   },
   "suggest": {
-    "superbalist/flysystem-google-storage": "Supports google flystore"
+    "league/flysystem-google-cloud-storage": "Supports google flystore"
   },
   "autoload": {
     "psr-4": {
@@ -107,5 +108,10 @@
     "psr-4": {
       "oat\\generis\\test\\": "generis/test/"
     }
+  },
+  "config": {
+    "allow-plugins": {
+      "oat-sa/oatbox-extension-installer": true
+    }
   }
 }