diff --git a/composer.lock b/composer.lock
index 6adc5a4..c26b52e 100644
--- a/composer.lock
+++ b/composer.lock
@@ -4,7 +4,7 @@
         "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#composer-lock-the-lock-file",
         "This file is @generated automatically"
     ],
-    "hash": "b04c7356be97fd379c1cb13021ca84dd",
+    "hash": "290ec143f080e1c734a859e075fe8298",
     "content-hash": "a79fdbd91551aa896dfeebc869a1fa27",
     "packages": [
         {
@@ -76,27 +76,27 @@
         },
         {
             "name": "guzzlehttp/guzzle",
-            "version": "6.2.0",
+            "version": "6.2.1",
             "source": {
                 "type": "git",
                 "url": "https://github.com/guzzle/guzzle.git",
-                "reference": "d094e337976dff9d8e2424e8485872194e768662"
+                "reference": "3f808fba627f2c5b69e2501217bf31af349c1427"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/guzzle/guzzle/zipball/d094e337976dff9d8e2424e8485872194e768662",
-                "reference": "d094e337976dff9d8e2424e8485872194e768662",
+                "url": "https://api.github.com/repos/guzzle/guzzle/zipball/3f808fba627f2c5b69e2501217bf31af349c1427",
+                "reference": "3f808fba627f2c5b69e2501217bf31af349c1427",
                 "shasum": ""
             },
             "require": {
-                "guzzlehttp/promises": "~1.0",
-                "guzzlehttp/psr7": "~1.1",
-                "php": ">=5.5.0"
+                "guzzlehttp/promises": "^1.0",
+                "guzzlehttp/psr7": "^1.3.1",
+                "php": ">=5.5"
             },
             "require-dev": {
                 "ext-curl": "*",
-                "phpunit/phpunit": "~4.0",
-                "psr/log": "~1.0"
+                "phpunit/phpunit": "^4.0",
+                "psr/log": "^1.0"
             },
             "type": "library",
             "extra": {
@@ -134,7 +134,7 @@
                 "rest",
                 "web service"
             ],
-            "time": "2016-03-21 20:02:09"
+            "time": "2016-07-15 17:22:37"
         },
         {
             "name": "guzzlehttp/promises",