diff --git a/.travis.yml b/.travis.yml
index a3fa48c..3308fdb 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,8 +1,11 @@
 language: php
 
 php:
-  - 5.6
-  - 7
+  - 7.0
+  - 7.1
+  - 7.2
+  - 7.3
+  - 7.4
 
 before_script:
   - composer install --prefer-dist --dev
diff --git a/composer.json b/composer.json
index 7499943..e7a92f4 100644
--- a/composer.json
+++ b/composer.json
@@ -1,12 +1,17 @@
 {
   "name": "vnn/wordpress-rest-api-client",
+  "config": {
+    "platform": {
+      "php": "7.0.33"
+    }
+  },
   "autoload": {
     "psr-4": {
       "Vnn\\WpApiClient\\": "src/"
     }
   },
   "require": {
-    "php": ">= 5.6, <= 8.0",
+    "php": "^7.0",
     "psr/http-message": "^1.0"
   },
   "require-dev": {
diff --git a/composer.lock b/composer.lock
index f5a79a4..86e5dcc 100644
--- a/composer.lock
+++ b/composer.lock
@@ -1,11 +1,10 @@
 {
     "_readme": [
         "This file locks the dependencies of your project to a known state",
-        "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#composer-lock-the-lock-file",
+        "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#installing-dependencies",
         "This file is @generated automatically"
     ],
-    "hash": "97cd566d3eea8745a0634998968f4a11",
-    "content-hash": "06e6daa87a8a0ea3bc19e0aa756bffa4",
+    "content-hash": "8769f4ab9b7eb7df179004be2ff079e3",
     "packages": [
         {
             "name": "psr/http-message",
@@ -55,7 +54,7 @@
                 "request",
                 "response"
             ],
-            "time": "2016-08-06 14:39:51"
+            "time": "2016-08-06T14:39:51+00:00"
         }
     ],
     "packages-dev": [
@@ -111,25 +110,28 @@
                 "constructor",
                 "instantiate"
             ],
-            "time": "2015-06-14 21:17:01"
+            "time": "2015-06-14T21:17:01+00:00"
         },
         {
             "name": "evenement/evenement",
-            "version": "v2.0.0",
+            "version": "v2.1.0",
             "source": {
                 "type": "git",
                 "url": "https://github.com/igorw/evenement.git",
-                "reference": "f6e843799fd4f4184d54d8fc7b5b3551c9fa803e"
+                "reference": "6ba9a777870ab49f417e703229d53931ed40fd7a"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/igorw/evenement/zipball/f6e843799fd4f4184d54d8fc7b5b3551c9fa803e",
-                "reference": "f6e843799fd4f4184d54d8fc7b5b3551c9fa803e",
+                "url": "https://api.github.com/repos/igorw/evenement/zipball/6ba9a777870ab49f417e703229d53931ed40fd7a",
+                "reference": "6ba9a777870ab49f417e703229d53931ed40fd7a",
                 "shasum": ""
             },
             "require": {
                 "php": ">=5.4.0"
             },
+            "require-dev": {
+                "phpunit/phpunit": "^6.0||^5.7||^4.8.35"
+            },
             "type": "library",
             "extra": {
                 "branch-alias": {
@@ -148,8 +150,7 @@
             "authors": [
                 {
                     "name": "Igor Wiedler",
-                    "email": "igor@wiedler.ch",
-                    "homepage": "http://wiedler.ch/igor/"
+                    "email": "igor@wiedler.ch"
                 }
             ],
             "description": "Événement is a very simple event dispatching library for PHP",
@@ -157,45 +158,50 @@
                 "event-dispatcher",
                 "event-emitter"
             ],
-            "time": "2012-11-02 14:49:47"
+            "time": "2017-07-17T17:39:19+00:00"
         },
         {
             "name": "guzzlehttp/guzzle",
-            "version": "6.2.1",
+            "version": "6.5.4",
             "source": {
                 "type": "git",
                 "url": "https://github.com/guzzle/guzzle.git",
-                "reference": "3f808fba627f2c5b69e2501217bf31af349c1427"
+                "reference": "a4a1b6930528a8f7ee03518e6442ec7a44155d9d"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/guzzle/guzzle/zipball/3f808fba627f2c5b69e2501217bf31af349c1427",
-                "reference": "3f808fba627f2c5b69e2501217bf31af349c1427",
+                "url": "https://api.github.com/repos/guzzle/guzzle/zipball/a4a1b6930528a8f7ee03518e6442ec7a44155d9d",
+                "reference": "a4a1b6930528a8f7ee03518e6442ec7a44155d9d",
                 "shasum": ""
             },
             "require": {
+                "ext-json": "*",
                 "guzzlehttp/promises": "^1.0",
-                "guzzlehttp/psr7": "^1.3.1",
-                "php": ">=5.5"
+                "guzzlehttp/psr7": "^1.6.1",
+                "php": ">=5.5",
+                "symfony/polyfill-intl-idn": "1.17.0"
             },
             "require-dev": {
                 "ext-curl": "*",
-                "phpunit/phpunit": "^4.0",
-                "psr/log": "^1.0"
+                "phpunit/phpunit": "^4.8.35 || ^5.7 || ^6.4 || ^7.0",
+                "psr/log": "^1.1"
+            },
+            "suggest": {
+                "psr/log": "Required for using the Log middleware"
             },
             "type": "library",
             "extra": {
                 "branch-alias": {
-                    "dev-master": "6.2-dev"
+                    "dev-master": "6.5-dev"
                 }
             },
             "autoload": {
-                "files": [
-                    "src/functions_include.php"
-                ],
                 "psr-4": {
                     "GuzzleHttp\\": "src/"
-                }
+                },
+                "files": [
+                    "src/functions_include.php"
+                ]
             },
             "notification-url": "https://packagist.org/downloads/",
             "license": [
@@ -219,32 +225,32 @@
                 "rest",
                 "web service"
             ],
-            "time": "2016-07-15 17:22:37"
+            "time": "2020-05-25T19:35:05+00:00"
         },
         {
             "name": "guzzlehttp/promises",
-            "version": "1.2.0",
+            "version": "v1.3.1",
             "source": {
                 "type": "git",
                 "url": "https://github.com/guzzle/promises.git",
-                "reference": "c10d860e2a9595f8883527fa0021c7da9e65f579"
+                "reference": "a59da6cf61d80060647ff4d3eb2c03a2bc694646"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/guzzle/promises/zipball/c10d860e2a9595f8883527fa0021c7da9e65f579",
-                "reference": "c10d860e2a9595f8883527fa0021c7da9e65f579",
+                "url": "https://api.github.com/repos/guzzle/promises/zipball/a59da6cf61d80060647ff4d3eb2c03a2bc694646",
+                "reference": "a59da6cf61d80060647ff4d3eb2c03a2bc694646",
                 "shasum": ""
             },
             "require": {
                 "php": ">=5.5.0"
             },
             "require-dev": {
-                "phpunit/phpunit": "~4.0"
+                "phpunit/phpunit": "^4.0"
             },
             "type": "library",
             "extra": {
                 "branch-alias": {
-                    "dev-master": "1.0-dev"
+                    "dev-master": "1.4-dev"
                 }
             },
             "autoload": {
@@ -270,36 +276,41 @@
             "keywords": [
                 "promise"
             ],
-            "time": "2016-05-18 16:56:05"
+            "time": "2016-12-20T10:07:11+00:00"
         },
         {
             "name": "guzzlehttp/psr7",
-            "version": "1.3.1",
+            "version": "1.6.1",
             "source": {
                 "type": "git",
                 "url": "https://github.com/guzzle/psr7.git",
-                "reference": "5c6447c9df362e8f8093bda8f5d8873fe5c7f65b"
+                "reference": "239400de7a173fe9901b9ac7c06497751f00727a"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/guzzle/psr7/zipball/5c6447c9df362e8f8093bda8f5d8873fe5c7f65b",
-                "reference": "5c6447c9df362e8f8093bda8f5d8873fe5c7f65b",
+                "url": "https://api.github.com/repos/guzzle/psr7/zipball/239400de7a173fe9901b9ac7c06497751f00727a",
+                "reference": "239400de7a173fe9901b9ac7c06497751f00727a",
                 "shasum": ""
             },
             "require": {
                 "php": ">=5.4.0",
-                "psr/http-message": "~1.0"
+                "psr/http-message": "~1.0",
+                "ralouphie/getallheaders": "^2.0.5 || ^3.0.0"
             },
             "provide": {
                 "psr/http-message-implementation": "1.0"
             },
             "require-dev": {
-                "phpunit/phpunit": "~4.0"
+                "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": "1.4-dev"
+                    "dev-master": "1.6-dev"
                 }
             },
             "autoload": {
@@ -319,43 +330,52 @@
                     "name": "Michael Dowling",
                     "email": "mtdowling@gmail.com",
                     "homepage": "https://github.com/mtdowling"
+                },
+                {
+                    "name": "Tobias Schultze",
+                    "homepage": "https://github.com/Tobion"
                 }
             ],
-            "description": "PSR-7 message implementation",
+            "description": "PSR-7 message implementation that also provides common utility methods",
             "keywords": [
                 "http",
                 "message",
+                "psr-7",
+                "request",
+                "response",
                 "stream",
-                "uri"
+                "uri",
+                "url"
             ],
-            "time": "2016-06-24 23:00:38"
+            "time": "2019-07-01T23:21:34+00:00"
         },
         {
             "name": "peridot-php/leo",
-            "version": "1.5.0",
+            "version": "1.6.1",
             "source": {
                 "type": "git",
                 "url": "https://github.com/peridot-php/leo.git",
-                "reference": "5ff1a9481faa37a55f5c6569379858dca01312f6"
+                "reference": "2a6f60f237498cd7c3e912d71dcb90424ab66e72"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/peridot-php/leo/zipball/5ff1a9481faa37a55f5c6569379858dca01312f6",
-                "reference": "5ff1a9481faa37a55f5c6569379858dca01312f6",
+                "url": "https://api.github.com/repos/peridot-php/leo/zipball/2a6f60f237498cd7c3e912d71dcb90424ab66e72",
+                "reference": "2a6f60f237498cd7c3e912d71dcb90424ab66e72",
                 "shasum": ""
             },
             "require": {
-                "php": ">=5.4.0"
+                "php": ">=5.4"
             },
             "require-dev": {
-                "peridot-php/peridot-jumpstart": "~1.0",
-                "peridot-php/peridot-prophecy-plugin": "~1.0",
-                "satooshi/php-coveralls": "~0.6"
+                "apigen/apigen": "^4",
+                "friendsofphp/php-cs-fixer": "^1",
+                "peridot-php/peridot-jumpstart": "^1",
+                "peridot-php/peridot-prophecy-plugin": "^1"
             },
             "type": "library",
             "autoload": {
                 "psr-4": {
-                    "Peridot\\Leo\\": "src/"
+                    "Peridot\\Leo\\": "src"
                 },
                 "files": [
                     "src/Interfaces/_interface.bdd.php"
@@ -379,33 +399,32 @@
                 "matcher",
                 "testing"
             ],
-            "time": "2016-03-02 04:33:43"
+            "time": "2017-08-16T21:40:18+00:00"
         },
         {
             "name": "peridot-php/peridot",
-            "version": "1.18.1",
+            "version": "1.19.0",
             "source": {
                 "type": "git",
                 "url": "https://github.com/peridot-php/peridot.git",
-                "reference": "d628aca3fc135a9b570acaeabaf4b39f2dc3a5d6"
+                "reference": "1c573868d856cee7fc9ba89f6a82730f79a3685e"
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             "dist": {
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-                "reference": "d628aca3fc135a9b570acaeabaf4b39f2dc3a5d6",
+                "url": "https://api.github.com/repos/peridot-php/peridot/zipball/1c573868d856cee7fc9ba89f6a82730f79a3685e",
+                "reference": "1c573868d856cee7fc9ba89f6a82730f79a3685e",
                 "shasum": ""
             },
             "require": {
-                "evenement/evenement": "2.0.*",
-                "peridot-php/peridot-scope": "~1.0",
-                "php": ">=5.4.0",
-                "phpunit/php-timer": "~1.0",
-                "symfony/console": "~2.0|~3.0"
+                "evenement/evenement": "^2",
+                "peridot-php/peridot-scope": "^1",
+                "php": ">=5.4",
+                "phpunit/php-timer": "^1",
+                "symfony/console": "^2|^3"
             },
             "require-dev": {
-                "codegyre/robo": "~0.4",
-                "phpunit/php-code-coverage": "~2.0",
-                "satooshi/php-coveralls": "~0.6"
+                "consolidation/robo": "^0.4",
+                "phpunit/php-code-coverage": "^2"
             },
             "bin": [
                 "bin/peridot"
@@ -437,7 +456,7 @@
                 "php",
                 "testing"
             ],
-            "time": "2016-04-22 17:32:25"
+            "time": "2017-01-19T01:11:09+00:00"
         },
         {
             "name": "peridot-php/peridot-prophecy-plugin",
@@ -474,7 +493,7 @@
                 }
             ],
             "description": "Inject prophecy mocks into your Peridot tests",
-            "time": "2014-11-25 17:54:09"
+            "time": "2014-11-25T17:54:09+00:00"
         },
         {
             "name": "peridot-php/peridot-scope",
@@ -513,20 +532,20 @@
                 }
             ],
             "description": "Scopes for function binding and mixins",
-            "time": "2016-02-22 13:27:54"
+            "time": "2016-02-22T13:27:54+00:00"
         },
         {
             "name": "phpdocumentor/reflection-common",
-            "version": "1.0",
+            "version": "1.0.1",
             "source": {
                 "type": "git",
                 "url": "https://github.com/phpDocumentor/ReflectionCommon.git",
-                "reference": "144c307535e82c8fdcaacbcfc1d6d8eeb896687c"
+                "reference": "21bdeb5f65d7ebf9f43b1b25d404f87deab5bfb6"
             },
             "dist": {
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-                "url": "https://api.github.com/repos/phpDocumentor/ReflectionCommon/zipball/144c307535e82c8fdcaacbcfc1d6d8eeb896687c",
-                "reference": "144c307535e82c8fdcaacbcfc1d6d8eeb896687c",
+                "url": "https://api.github.com/repos/phpDocumentor/ReflectionCommon/zipball/21bdeb5f65d7ebf9f43b1b25d404f87deab5bfb6",
+                "reference": "21bdeb5f65d7ebf9f43b1b25d404f87deab5bfb6",
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             },
             "require": {
@@ -567,33 +586,40 @@
                 "reflection",
                 "static analysis"
             ],
-            "time": "2015-12-27 11:43:31"
+            "time": "2017-09-11T18:02:19+00:00"
         },
         {
             "name": "phpdocumentor/reflection-docblock",
-            "version": "3.1.0",
+            "version": "4.3.4",
             "source": {
                 "type": "git",
                 "url": "https://github.com/phpDocumentor/ReflectionDocBlock.git",
-                "reference": "9270140b940ff02e58ec577c237274e92cd40cdd"
+                "reference": "da3fd972d6bafd628114f7e7e036f45944b62e9c"
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-                "reference": "9270140b940ff02e58ec577c237274e92cd40cdd",
+                "url": "https://api.github.com/repos/phpDocumentor/ReflectionDocBlock/zipball/da3fd972d6bafd628114f7e7e036f45944b62e9c",
+                "reference": "da3fd972d6bafd628114f7e7e036f45944b62e9c",
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             },
             "require": {
-                "php": ">=5.5",
-                "phpdocumentor/reflection-common": "^1.0@dev",
-                "phpdocumentor/type-resolver": "^0.2.0",
+                "php": "^7.0",
+                "phpdocumentor/reflection-common": "^1.0.0 || ^2.0.0",
+                "phpdocumentor/type-resolver": "~0.4 || ^1.0.0",
                 "webmozart/assert": "^1.0"
             },
             "require-dev": {
-                "mockery/mockery": "^0.9.4",
-                "phpunit/phpunit": "^4.4"
+                "doctrine/instantiator": "^1.0.5",
+                "mockery/mockery": "^1.0",
+                "phpdocumentor/type-resolver": "0.4.*",
+                "phpunit/phpunit": "^6.4"
             },
             "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "4.x-dev"
+                }
+            },
             "autoload": {
                 "psr-4": {
                     "phpDocumentor\\Reflection\\": [
@@ -612,29 +638,29 @@
                 }
             ],
             "description": "With this component, a library can provide support for annotations via DocBlocks or otherwise retrieve information that is embedded in a DocBlock.",
-            "time": "2016-06-10 09:48:41"
+            "time": "2019-12-28T18:55:12+00:00"
         },
         {
             "name": "phpdocumentor/type-resolver",
-            "version": "0.2",
+            "version": "0.5.1",
             "source": {
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                 "url": "https://github.com/phpDocumentor/TypeResolver.git",
-                "reference": "b39c7a5b194f9ed7bd0dd345c751007a41862443"
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-                "reference": "b39c7a5b194f9ed7bd0dd345c751007a41862443",
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             "require": {
-                "php": ">=5.5",
+                "php": "^7.0",
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             },
             "require-dev": {
-                "mockery/mockery": "^0.9.4",
-                "phpunit/phpunit": "^5.2||^4.8.24"
+                "mockery/mockery": "^1.0",
+                "phpunit/phpunit": "^6.4"
             },
             "type": "library",
             "extra": {
@@ -644,9 +670,7 @@
             },
             "autoload": {
                 "psr-4": {
-                    "phpDocumentor\\Reflection\\": [
-                        "src/"
-                    ]
+                    "phpDocumentor\\Reflection\\": "src"
                 }
             },
             "notification-url": "https://packagist.org/downloads/",
@@ -659,41 +683,42 @@
                     "email": "me@mikevanriel.com"
                 }
             ],
-            "time": "2016-06-10 07:14:17"
+            "time": "2017-12-30T13:23:38+00:00"
         },
         {
             "name": "phpspec/prophecy",
-            "version": "v1.6.1",
+            "version": "v1.10.3",
             "source": {
                 "type": "git",
                 "url": "https://github.com/phpspec/prophecy.git",
-                "reference": "58a8137754bc24b25740d4281399a4a3596058e0"
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-                "reference": "58a8137754bc24b25740d4281399a4a3596058e0",
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                 "doctrine/instantiator": "^1.0.2",
                 "php": "^5.3|^7.0",
-                "phpdocumentor/reflection-docblock": "^2.0|^3.0.2",
-                "sebastian/comparator": "^1.1",
-                "sebastian/recursion-context": "^1.0"
+                "phpdocumentor/reflection-docblock": "^2.0|^3.0.2|^4.0|^5.0",
+                "sebastian/comparator": "^1.2.3|^2.0|^3.0|^4.0",
+                "sebastian/recursion-context": "^1.0|^2.0|^3.0|^4.0"
             },
             "require-dev": {
-                "phpspec/phpspec": "^2.0"
+                "phpspec/phpspec": "^2.5 || ^3.2",
+                "phpunit/phpunit": "^4.8.35 || ^5.7 || ^6.5 || ^7.1"
             },
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+                "url": "https://github.com/symfony/polyfill-intl-idn.git",
+                "reference": "3bff59ea7047e925be6b7f2059d60af31bb46d6a"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/symfony/polyfill-intl-idn/zipball/3bff59ea7047e925be6b7f2059d60af31bb46d6a",
+                "reference": "3bff59ea7047e925be6b7f2059d60af31bb46d6a",
+                "shasum": ""
+            },
+            "require": {
+                "php": ">=5.3.3",
+                "symfony/polyfill-mbstring": "^1.3",
+                "symfony/polyfill-php72": "^1.10"
+            },
+            "suggest": {
+                "ext-intl": "For best performance"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "1.17-dev"
+                }
+            },
+            "autoload": {
+                "psr-4": {
+                    "Symfony\\Polyfill\\Intl\\Idn\\": ""
+                },
+                "files": [
+                    "bootstrap.php"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "authors": [
+                {
+                    "name": "Laurent Bassin",
+                    "email": "laurent@bassin.info"
+                },
+                {
+                    "name": "Symfony Community",
+                    "homepage": "https://symfony.com/contributors"
+                }
+            ],
+            "description": "Symfony polyfill for intl's idn_to_ascii and idn_to_utf8 functions",
+            "homepage": "https://symfony.com",
+            "keywords": [
+                "compatibility",
+                "idn",
+                "intl",
+                "polyfill",
+                "portable",
+                "shim"
+            ],
+            "funding": [
+                {
+                    "url": "https://symfony.com/sponsor",
+                    "type": "custom"
+                },
+                {
+                    "url": "https://github.com/fabpot",
+                    "type": "github"
+                },
+                {
+                    "url": "https://tidelift.com/funding/github/packagist/symfony/symfony",
+                    "type": "tidelift"
+                }
+            ],
+            "time": "2020-05-12T16:47:27+00:00"
         },
         {
             "name": "symfony/polyfill-mbstring",
-            "version": "v1.2.0",
+            "version": "v1.17.0",
             "source": {
                 "type": "git",
                 "url": "https://github.com/symfony/polyfill-mbstring.git",
-                "reference": "dff51f72b0706335131b00a7f49606168c582594"
+                "reference": "fa79b11539418b02fc5e1897267673ba2c19419c"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/symfony/polyfill-mbstring/zipball/dff51f72b0706335131b00a7f49606168c582594",
-                "reference": "dff51f72b0706335131b00a7f49606168c582594",
+                "url": "https://api.github.com/repos/symfony/polyfill-mbstring/zipball/fa79b11539418b02fc5e1897267673ba2c19419c",
+                "reference": "fa79b11539418b02fc5e1897267673ba2c19419c",
                 "shasum": ""
             },
             "require": {
@@ -1164,7 +1525,7 @@
             "type": "library",
             "extra": {
                 "branch-alias": {
-                    "dev-master": "1.2-dev"
+                    "dev-master": "1.17-dev"
                 }
             },
             "autoload": {
@@ -1198,35 +1559,117 @@
                 "portable",
                 "shim"
             ],
-            "time": "2016-05-18 14:26:46"
+            "funding": [
+                {
+                    "url": "https://symfony.com/sponsor",
+                    "type": "custom"
+                },
+                {
+                    "url": "https://github.com/fabpot",
+                    "type": "github"
+                },
+                {
+                    "url": "https://tidelift.com/funding/github/packagist/symfony/symfony",
+                    "type": "tidelift"
+                }
+            ],
+            "time": "2020-05-12T16:47:27+00:00"
         },
         {
-            "name": "webmozart/assert",
-            "version": "1.1.0",
+            "name": "symfony/polyfill-php72",
+            "version": "v1.17.0",
             "source": {
                 "type": "git",
-                "url": "https://github.com/webmozart/assert.git",
-                "reference": "bb2d123231c095735130cc8f6d31385a44c7b308"
+                "url": "https://github.com/symfony/polyfill-php72.git",
+                "reference": "f048e612a3905f34931127360bdd2def19a5e582"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/webmozart/assert/zipball/bb2d123231c095735130cc8f6d31385a44c7b308",
-                "reference": "bb2d123231c095735130cc8f6d31385a44c7b308",
+                "url": "https://api.github.com/repos/symfony/polyfill-php72/zipball/f048e612a3905f34931127360bdd2def19a5e582",
+                "reference": "f048e612a3905f34931127360bdd2def19a5e582",
                 "shasum": ""
             },
             "require": {
-                "php": "^5.3.3|^7.0"
-            },
-            "require-dev": {
-                "phpunit/phpunit": "^4.6",
-                "sebastian/version": "^1.0.1"
+                "php": ">=5.3.3"
             },
             "type": "library",
             "extra": {
                 "branch-alias": {
-                    "dev-master": "1.2-dev"
+                    "dev-master": "1.17-dev"
+                }
+            },
+            "autoload": {
+                "psr-4": {
+                    "Symfony\\Polyfill\\Php72\\": ""
+                },
+                "files": [
+                    "bootstrap.php"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "authors": [
+                {
+                    "name": "Nicolas Grekas",
+                    "email": "p@tchwork.com"
+                },
+                {
+                    "name": "Symfony Community",
+                    "homepage": "https://symfony.com/contributors"
+                }
+            ],
+            "description": "Symfony polyfill backporting some PHP 7.2+ features to lower PHP versions",
+            "homepage": "https://symfony.com",
+            "keywords": [
+                "compatibility",
+                "polyfill",
+                "portable",
+                "shim"
+            ],
+            "funding": [
+                {
+                    "url": "https://symfony.com/sponsor",
+                    "type": "custom"
+                },
+                {
+                    "url": "https://github.com/fabpot",
+                    "type": "github"
+                },
+                {
+                    "url": "https://tidelift.com/funding/github/packagist/symfony/symfony",
+                    "type": "tidelift"
                 }
+            ],
+            "time": "2020-05-12T16:47:27+00:00"
+        },
+        {
+            "name": "webmozart/assert",
+            "version": "1.9.0",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/webmozart/assert.git",
+                "reference": "9dc4f203e36f2b486149058bade43c851dd97451"
             },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/webmozart/assert/zipball/9dc4f203e36f2b486149058bade43c851dd97451",
+                "reference": "9dc4f203e36f2b486149058bade43c851dd97451",
+                "shasum": ""
+            },
+            "require": {
+                "php": "^5.3.3 || ^7.0",
+                "symfony/polyfill-ctype": "^1.8"
+            },
+            "conflict": {
+                "phpstan/phpstan": "<0.12.20",
+                "vimeo/psalm": "<3.9.1"
+            },
+            "require-dev": {
+                "phpunit/phpunit": "^4.8.36 || ^7.5.13"
+            },
+            "type": "library",
             "autoload": {
                 "psr-4": {
                     "Webmozart\\Assert\\": "src/"
@@ -1248,7 +1691,7 @@
                 "check",
                 "validate"
             ],
-            "time": "2016-08-09 15:02:57"
+            "time": "2020-06-16T10:16:42+00:00"
         }
     ],
     "aliases": [],
@@ -1257,7 +1700,11 @@
     "prefer-stable": false,
     "prefer-lowest": false,
     "platform": {
-        "php": ">= 5.6, <= 8.0"
+        "php": "^7.0"
+    },
+    "platform-dev": [],
+    "platform-overrides": {
+        "php": "7.0.33"
     },
-    "platform-dev": []
+    "plugin-api-version": "1.1.0"
 }
diff --git a/specs/Endpoint/abstract-wp-endpoint.spec.php b/specs/Endpoint/abstract-wp-endpoint.spec.php
index 11c82c7..c026e40 100644
--- a/specs/Endpoint/abstract-wp-endpoint.spec.php
+++ b/specs/Endpoint/abstract-wp-endpoint.spec.php
@@ -61,6 +61,17 @@
             $data = $endpoint->save(['foo' => 'bar']);
             expect($data)->to->equal(['foo' => 'bar']);
         });
+
+        it('should handle unicode data', function() {
+            $client = $this->getProphet()->prophesize(WpClient::class);
+            $response = new \GuzzleHttp\Psr7\Response(200, ['Content-Type' => 'application/json'], '{"first": "Iván", "last": "Peña"}');
+            $client->send(\Prophecy\Argument::type(Request::class))->willReturn($response)->shouldBeCalled();
+
+            $endpoint = new FakeEndpoint($client->reveal());
+
+            $data = $endpoint->save(['first' => 'Iván', 'last' => 'Peña']);
+            expect($data)->to->equal(['first' => 'Iván', 'last' => 'Peña']);
+        });
     });
 
     afterEach(function () {
diff --git a/specs/Endpoint/media.spec.php b/specs/Endpoint/media.spec.php
new file mode 100644
index 0000000..bf85224
--- /dev/null
+++ b/specs/Endpoint/media.spec.php
@@ -0,0 +1,92 @@
+<?php
+
+use Vnn\WpApiClient\Endpoint\Media;
+use Vnn\WpApiClient\WpClient;
+use Vnn\WpApiClient\Http\GuzzleAdapter;
+use Vnn\WpApiClient\Auth\WpBasicAuth;
+use Prophecy\Argument;
+use GuzzleHttp\Psr7\Request;
+use Psr\Http\Message\ResponseInterface;
+use Psr\Http\Message\StreamInterface;
+
+describe(Media::class, function () {
+    beforeEach(function () {
+        $this->wpClient = $this->getProphet()->prophesize(WpClient::class);
+        $this->mediaEndpoint = new Media($this->wpClient->reveal());
+    });
+
+    context('when the file to be uploaded is not found', function () {
+        xit('should throw a Runtime Exception for a missing remote file', function () {
+            $imgUrl = 'http://example.com/img/baby-squirrel-eating-pizza.jpg';
+            $contentType = 'image/jpeg';
+            set_error_handler(function (int $errno, string $errstr, string $errfile) {
+                expect($errno)->to->equal(E_WARNING);
+                expect(strpos($errstr, '404 Not Found'))->to->not->equal(false);
+            });
+
+            expect(
+                [
+                    $this->mediaEndpoint,
+                    'upload'
+                ]
+            )
+                ->with($imgUrl, [], $contentType)
+                ->to->throw(RuntimeException::class);
+
+            restore_error_handler();
+        });
+
+        it('should throw a Runtime Exception for a missing local file', function () {
+            $filename = realpath(dirname('../')) . '/file-does-not-exist.txt';
+
+            set_error_handler(function (int $errno, string $errstr, string $errfile) {
+                expect($errno)->to->equal(E_WARNING);
+                expect(strpos($errstr, ' No such file or directory'))->to->not->equal(false);
+            });
+
+            expect(
+                [
+                    $this->mediaEndpoint,
+                    'upload'
+                ]
+            )
+                ->with($filename)
+                ->to->throw(RuntimeException::class);
+
+            restore_error_handler();
+        });
+    });
+
+    context('when the file to be upload exists', function () {
+        it('should attempt to create a new media item using a POST request', function () {
+            // mocking the response...
+            $streamResponse = $this->getProphet()->prophesize(StreamInterface::class);
+            $streamResponse->getContents()->willReturn(json_encode(['id' => 32, 'date' => (new DateTime())->format('c')]))
+                ->shouldBeCalled();
+
+            $response = $this->getProphet()->prophesize(ResponseInterface::class);
+            $response->hasHeader('Content-Type')->willReturn(true)->shouldBeCalled();
+            $response->getHeader('Content-Type')->willReturn(['application/json'])->shouldBeCalled();
+            $response->getBody()->willReturn($streamResponse->reveal());
+
+            $this->wpClient
+                ->send(Argument::that(function($arg) {
+                    return ($arg instanceof Request) &&
+                        $arg->getHeader('Content-Type') == ['text/plain'] &&
+                        $arg->getHeader('Content-Disposition') == ['attachment; filename="README.md"'] &&
+                        $arg->getMethod() == 'POST'
+                    ;
+                }))
+                ->willReturn($response->reveal())
+                ->shouldBeCalled();
+
+            $filename = realpath(dirname('../')) . '/README.md';
+            $response = $this->mediaEndpoint->upload($filename);
+            expect($response['id'])->to->equal(32);
+        });
+    });
+
+    afterEach(function () {
+        $this->getProphet()->checkPredictions();
+    });
+});
diff --git a/src/Endpoint/AbstractWpEndpoint.php b/src/Endpoint/AbstractWpEndpoint.php
index d1664b6..f1105d9 100644
--- a/src/Endpoint/AbstractWpEndpoint.php
+++ b/src/Endpoint/AbstractWpEndpoint.php
@@ -15,7 +15,7 @@ abstract class AbstractWpEndpoint
     /**
      * @var WpClient
      */
-    private $client;
+    protected $client;
 
     /**
      * Users constructor.
diff --git a/src/Endpoint/Media.php b/src/Endpoint/Media.php
index 6647ffd..cd3fe09 100644
--- a/src/Endpoint/Media.php
+++ b/src/Endpoint/Media.php
@@ -2,6 +2,9 @@
 
 namespace Vnn\WpApiClient\Endpoint;
 
+use GuzzleHttp\Psr7\Request;
+use RuntimeException;
+
 /**
  * Class Media
  * @package Vnn\WpApiClient\Endpoint
@@ -15,4 +18,47 @@ protected function getEndpoint()
     {
         return '/wp-json/wp/v2/media';
     }
+
+    /**
+     * @param string $filePath absolute path of file to upload, or full URL of resource
+     * @param array $data
+     * @param string $mimeType if $filePath is a URL, the mime type of the file to be uploaded
+     * @throws \RuntimeException
+     * @return array
+     */
+    public function upload(string $filePath, array $data = [], $mimeType = null) : array
+    {
+        $url = $this->getEndpoint();
+
+        if (isset($data['id'])) {
+            $url .= '/' . $data['id'];
+            unset($data['id']);
+        }
+
+        $fileName = basename($filePath);
+        $fileHandle = fopen($filePath, "r");
+
+        if ($fileHandle !== false) {
+            if (!$mimeType) {
+                $mimeType = mime_content_type($filePath);
+            }
+
+            $request = new Request(
+                'POST',
+                $url,
+                [
+                    'Content-Type' => $mimeType,
+                    'Content-Disposition' => 'attachment; filename="'.$fileName.'"'
+                ],
+                $fileHandle
+            );
+            $response = $this->client->send($request);
+            fclose($fileHandle);
+            if ($response->hasHeader('Content-Type') &&
+                substr($response->getHeader('Content-Type')[0], 0, 16) === 'application/json') {
+                    return json_decode($response->getBody()->getContents(), true);
+            }
+        }
+        throw new RuntimeException('Unexpected response');
+    }
 }