diff --git a/composer.json b/composer.json
index 6431520..07e9c10 100644
--- a/composer.json
+++ b/composer.json
@@ -1,5 +1,5 @@
 {
-    "name": "upyun/sdk",
+    "name": "guoxiangke/upyun-sdk",
     "description": "UPYUN sdk for php",
     "keywords": ["UPYUN", "sdk"],
     "type": "library",
@@ -9,7 +9,7 @@
     "require": {
         "php": ">=5.5.0",
         "ext-curl": "*",
-        "guzzlehttp/guzzle": "~6.0"
+        "guzzlehttp/guzzle": "^7.0"
     },
     "require-dev": {
         "phpunit/phpunit": "~4.0",
diff --git a/src/Upyun/Api/Rest.php b/src/Upyun/Api/Rest.php
index be4b0a0..53a71a0 100644
--- a/src/Upyun/Api/Rest.php
+++ b/src/Upyun/Api/Rest.php
@@ -47,7 +47,7 @@ public function request($method, $storagePath)
      */
     public function withFile($file)
     {
-        $stream = Psr7\stream_for($file);
+        $stream = \GuzzleHttp\Psr7\Utils::streamFor($file);
         $this->file = $stream;
 
         return $this;
diff --git a/src/Upyun/Uploader.php b/src/Upyun/Uploader.php
index 95e6f2f..037b73b 100644
--- a/src/Upyun/Uploader.php
+++ b/src/Upyun/Uploader.php
@@ -24,7 +24,7 @@ public function __construct(Config $config)
 
     public function upload($path, $file, $params, $withAsyncProcess)
     {
-        $stream = Psr7\stream_for($file);
+        $stream = \GuzzleHttp\Psr7\Utils::streamFor($file);
         $size = $stream->getSize();
         $useBlock = $this->needUseBlock($size);
 
@@ -87,7 +87,7 @@ private function pointUpload($path, $stream, $params)
                     'X-Upyun-Multi-Uuid' => $uuid,
                     'X-Upyun-Part-Id' => $partId
                 ))
-                ->withFile(Psr7\stream_for($fileBlock))
+                ->withFile(\GuzzleHttp\Psr7\Utils::streamFor($fileBlock))
                 ->send();
 
             if ($res->getStatusCode() !== 204) {
@@ -167,7 +167,7 @@ private function concurrentPointUpload($path, $stream, $params)
                         'X-Upyun-Multi-Uuid' => $uuid,
                         'X-Upyun-Part-Id' => $i
                     ))
-                    ->withFile(Psr7\stream_for($fileBlock))
+                    ->withFile(\GuzzleHttp\Psr7\Utils::streamFor($fileBlock))
                     ->toRequest();
             }
         };
diff --git a/src/Upyun/Upyun.php b/src/Upyun/Upyun.php
index e74c6c7..40c5ee3 100644
--- a/src/Upyun/Upyun.php
+++ b/src/Upyun/Upyun.php
@@ -154,7 +154,7 @@ public function read($path, $saveHandler = null, $params = array())
 
         if (! isset($params['x-upyun-list-iter'])) {
             if (is_resource($saveHandler)) {
-                Psr7\copy_to_stream($response->getBody(), Psr7\stream_for($saveHandler));
+                Psr7\copy_to_stream($response->getBody(), \GuzzleHttp\Psr7\Utils::streamFor($saveHandler));
                 return true;
             } else {
                 return $response->getBody()->getContents();