diff --git a/composer.lock b/composer.lock
index 81612a8..f746144 100644
--- a/composer.lock
+++ b/composer.lock
@@ -8,27 +8,28 @@
     "packages": [
         {
             "name": "guzzlehttp/guzzle",
-            "version": "6.3.3",
+            "version": "6.4.1",
             "source": {
                 "type": "git",
                 "url": "https://github.com/guzzle/guzzle.git",
-                "reference": "407b0cb880ace85c9b63c5f9551db498cb2d50ba"
+                "reference": "0895c932405407fd3a7368b6910c09a24d26db11"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/guzzle/guzzle/zipball/407b0cb880ace85c9b63c5f9551db498cb2d50ba",
-                "reference": "407b0cb880ace85c9b63c5f9551db498cb2d50ba",
+                "url": "https://api.github.com/repos/guzzle/guzzle/zipball/0895c932405407fd3a7368b6910c09a24d26db11",
+                "reference": "0895c932405407fd3a7368b6910c09a24d26db11",
                 "shasum": ""
             },
             "require": {
+                "ext-json": "*",
                 "guzzlehttp/promises": "^1.0",
-                "guzzlehttp/psr7": "^1.4",
+                "guzzlehttp/psr7": "^1.6.1",
                 "php": ">=5.5"
             },
             "require-dev": {
                 "ext-curl": "*",
                 "phpunit/phpunit": "^4.8.35 || ^5.7 || ^6.4 || ^7.0",
-                "psr/log": "^1.0"
+                "psr/log": "^1.1"
             },
             "suggest": {
                 "psr/log": "Required for using the Log middleware"
@@ -40,12 +41,12 @@
                 }
             },
             "autoload": {
-                "files": [
-                    "src/functions_include.php"
-                ],
                 "psr-4": {
                     "GuzzleHttp\\": "src/"
-                }
+                },
+                "files": [
+                    "src/functions_include.php"
+                ]
             },
             "notification-url": "https://packagist.org/downloads/",
             "license": [
@@ -69,7 +70,7 @@
                 "rest",
                 "web service"
             ],
-            "time": "2018-04-22T15:46:56+00:00"
+            "time": "2019-10-23T15:58:00+00:00"
         },
         {
             "name": "guzzlehttp/promises",
@@ -124,33 +125,37 @@
         },
         {
             "name": "guzzlehttp/psr7",
-            "version": "1.5.2",
+            "version": "1.6.1",
             "source": {
                 "type": "git",
                 "url": "https://github.com/guzzle/psr7.git",
-                "reference": "9f83dded91781a01c63574e387eaa769be769115"
+                "reference": "239400de7a173fe9901b9ac7c06497751f00727a"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/guzzle/psr7/zipball/9f83dded91781a01c63574e387eaa769be769115",
-                "reference": "9f83dded91781a01c63574e387eaa769be769115",
+                "url": "https://api.github.com/repos/guzzle/psr7/zipball/239400de7a173fe9901b9ac7c06497751f00727a",
+                "reference": "239400de7a173fe9901b9ac7c06497751f00727a",
                 "shasum": ""
             },
             "require": {
                 "php": ">=5.4.0",
                 "psr/http-message": "~1.0",
-                "ralouphie/getallheaders": "^2.0.5"
+                "ralouphie/getallheaders": "^2.0.5 || ^3.0.0"
             },
             "provide": {
                 "psr/http-message-implementation": "1.0"
             },
             "require-dev": {
+                "ext-zlib": "*",
                 "phpunit/phpunit": "~4.8.36 || ^5.7.27 || ^6.5.8"
             },
+            "suggest": {
+                "zendframework/zend-httphandlerrunner": "Emit PSR-7 responses"
+            },
             "type": "library",
             "extra": {
                 "branch-alias": {
-                    "dev-master": "1.5-dev"
+                    "dev-master": "1.6-dev"
                 }
             },
             "autoload": {
@@ -187,7 +192,7 @@
                 "uri",
                 "url"
             ],
-            "time": "2018-12-04T20:46:45+00:00"
+            "time": "2019-07-01T23:21:34+00:00"
         },
         {
             "name": "league/commonmark",
@@ -462,24 +467,24 @@
         },
         {
             "name": "ralouphie/getallheaders",
-            "version": "2.0.5",
+            "version": "3.0.3",
             "source": {
                 "type": "git",
                 "url": "https://github.com/ralouphie/getallheaders.git",
-                "reference": "5601c8a83fbba7ef674a7369456d12f1e0d0eafa"
+                "reference": "120b605dfeb996808c31b6477290a714d356e822"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/ralouphie/getallheaders/zipball/5601c8a83fbba7ef674a7369456d12f1e0d0eafa",
-                "reference": "5601c8a83fbba7ef674a7369456d12f1e0d0eafa",
+                "url": "https://api.github.com/repos/ralouphie/getallheaders/zipball/120b605dfeb996808c31b6477290a714d356e822",
+                "reference": "120b605dfeb996808c31b6477290a714d356e822",
                 "shasum": ""
             },
             "require": {
-                "php": ">=5.3"
+                "php": ">=5.6"
             },
             "require-dev": {
-                "phpunit/phpunit": "~3.7.0",
-                "satooshi/php-coveralls": ">=1.0"
+                "php-coveralls/php-coveralls": "^2.1",
+                "phpunit/phpunit": "^5 || ^6.5"
             },
             "type": "library",
             "autoload": {
@@ -498,7 +503,7 @@
                 }
             ],
             "description": "A polyfill for getallheaders.",
-            "time": "2016-02-11T07:05:27+00:00"
+            "time": "2019-03-08T08:55:37+00:00"
         },
         {
             "name": "scrivo/highlight.php",