diff --git a/.gitignore b/.gitignore
index 4046c1b..a698984 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,4 +1,5 @@
 .env
 .idea
 coverage.xml
-vendor
\ No newline at end of file
+vendor
+.phpunit.result.cache
\ No newline at end of file
diff --git a/.travis.yml b/.travis.yml
index 25fe7b8..0394270 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,7 +1,7 @@
 language: php
 php:
-  - '7.2'
-  - '7.3'
+  - '7.4'
+  - '8.0'
 
 before_script:
   - composer install
diff --git a/README.md b/README.md
index 3109114..81808db 100644
--- a/README.md
+++ b/README.md
@@ -8,7 +8,7 @@ It is simple wrapper class written in php to fetch posts from certain Facebook p
 
 Currently I am using [Facebook graph API](https://developers.facebook.com/docs/graph-api) with cool [guzzle](https://github.com/guzzle/guzzle) and [dotenv](https://github.com/vlucas/phpdotenv)
 
-Tested in PHP 7.0 and 7.1
+Tested in PHP 7.0, 7.1, 7.4, 8.0
 
 ## Requirement
 - PHP 7.0+
diff --git a/composer.json b/composer.json
index 1212f09..9390fac 100644
--- a/composer.json
+++ b/composer.json
@@ -13,16 +13,22 @@
     ],
     "require": {
         "php": ">=7.0",
-        "kitetail/zttp": "^0.6.0"
+        "guzzlehttp/guzzle": "^7.3",
+        "ext-json": "*"
     },
     "require-dev": {
         "vlucas/phpdotenv": "~2.2",
-        "phpunit/phpunit": "^6.0"
+        "phpunit/phpunit": "^9.0"
     },
     "autoload": {
         "psr-4": {
             "Xmhafiz\\FbFeed\\": "src/"
         },
         "files": ["helper/helpers.php"]
+    },
+    "autoload-dev": {
+        "psr-4": {
+            "Tests\\": "tests/"
+        }
     }
 }
diff --git a/composer.lock b/composer.lock
index 08695cf..1a4a96d 100644
--- a/composer.lock
+++ b/composer.lock
@@ -4,41 +4,48 @@
         "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#installing-dependencies",
         "This file is @generated automatically"
     ],
-    "content-hash": "86278b4a4206eb5c46f7c79fd137d33e",
+    "content-hash": "86563ebc0b5cd602094911e722a012ef",
     "packages": [
         {
             "name": "guzzlehttp/guzzle",
-            "version": "6.5.5",
+            "version": "7.3.0",
             "source": {
                 "type": "git",
                 "url": "https://github.com/guzzle/guzzle.git",
-                "reference": "9d4290de1cfd701f38099ef7e183b64b4b7b0c5e"
+                "reference": "7008573787b430c1c1f650e3722d9bba59967628"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/guzzle/guzzle/zipball/9d4290de1cfd701f38099ef7e183b64b4b7b0c5e",
-                "reference": "9d4290de1cfd701f38099ef7e183b64b4b7b0c5e",
+                "url": "https://api.github.com/repos/guzzle/guzzle/zipball/7008573787b430c1c1f650e3722d9bba59967628",
+                "reference": "7008573787b430c1c1f650e3722d9bba59967628",
                 "shasum": ""
             },
             "require": {
                 "ext-json": "*",
-                "guzzlehttp/promises": "^1.0",
-                "guzzlehttp/psr7": "^1.6.1",
-                "php": ">=5.5",
-                "symfony/polyfill-intl-idn": "^1.17.0"
+                "guzzlehttp/promises": "^1.4",
+                "guzzlehttp/psr7": "^1.7 || ^2.0",
+                "php": "^7.2.5 || ^8.0",
+                "psr/http-client": "^1.0"
+            },
+            "provide": {
+                "psr/http-client-implementation": "1.0"
             },
             "require-dev": {
+                "bamarni/composer-bin-plugin": "^1.4.1",
                 "ext-curl": "*",
-                "phpunit/phpunit": "^4.8.35 || ^5.7 || ^6.4 || ^7.0",
+                "php-http/client-integration-tests": "^3.0",
+                "phpunit/phpunit": "^8.5.5 || ^9.3.5",
                 "psr/log": "^1.1"
             },
             "suggest": {
+                "ext-curl": "Required for CURL handler support",
+                "ext-intl": "Required for Internationalized Domain Name (IDN) support",
                 "psr/log": "Required for using the Log middleware"
             },
             "type": "library",
             "extra": {
                 "branch-alias": {
-                    "dev-master": "6.5-dev"
+                    "dev-master": "7.3-dev"
                 }
             },
             "autoload": {
@@ -58,6 +65,11 @@
                     "name": "Michael Dowling",
                     "email": "mtdowling@gmail.com",
                     "homepage": "https://github.com/mtdowling"
+                },
+                {
+                    "name": "Márk Sági-Kazár",
+                    "email": "mark.sagikazar@gmail.com",
+                    "homepage": "https://sagikazarmark.hu"
                 }
             ],
             "description": "Guzzle is a PHP HTTP client library",
@@ -68,23 +80,47 @@
                 "framework",
                 "http",
                 "http client",
+                "psr-18",
+                "psr-7",
                 "rest",
                 "web service"
             ],
-            "time": "2020-06-16T21:01:06+00:00"
+            "support": {
+                "issues": "https://github.com/guzzle/guzzle/issues",
+                "source": "https://github.com/guzzle/guzzle/tree/7.3.0"
+            },
+            "funding": [
+                {
+                    "url": "https://github.com/GrahamCampbell",
+                    "type": "github"
+                },
+                {
+                    "url": "https://github.com/Nyholm",
+                    "type": "github"
+                },
+                {
+                    "url": "https://github.com/alexeyshockov",
+                    "type": "github"
+                },
+                {
+                    "url": "https://github.com/gmponos",
+                    "type": "github"
+                }
+            ],
+            "time": "2021-03-23T11:33:13+00:00"
         },
         {
             "name": "guzzlehttp/promises",
-            "version": "1.4.0",
+            "version": "1.5.0",
             "source": {
                 "type": "git",
                 "url": "https://github.com/guzzle/promises.git",
-                "reference": "60d379c243457e073cff02bc323a2a86cb355631"
+                "reference": "136a635e2b4a49b9d79e9c8fee267ffb257fdba0"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/guzzle/promises/zipball/60d379c243457e073cff02bc323a2a86cb355631",
-                "reference": "60d379c243457e073cff02bc323a2a86cb355631",
+                "url": "https://api.github.com/repos/guzzle/promises/zipball/136a635e2b4a49b9d79e9c8fee267ffb257fdba0",
+                "reference": "136a635e2b4a49b9d79e9c8fee267ffb257fdba0",
                 "shasum": ""
             },
             "require": {
@@ -96,7 +132,7 @@
             "type": "library",
             "extra": {
                 "branch-alias": {
-                    "dev-master": "1.4-dev"
+                    "dev-master": "1.5-dev"
                 }
             },
             "autoload": {
@@ -112,43 +148,79 @@
                 "MIT"
             ],
             "authors": [
+                {
+                    "name": "Graham Campbell",
+                    "email": "hello@gjcampbell.co.uk",
+                    "homepage": "https://github.com/GrahamCampbell"
+                },
                 {
                     "name": "Michael Dowling",
                     "email": "mtdowling@gmail.com",
                     "homepage": "https://github.com/mtdowling"
+                },
+                {
+                    "name": "Tobias Nyholm",
+                    "email": "tobias.nyholm@gmail.com",
+                    "homepage": "https://github.com/Nyholm"
+                },
+                {
+                    "name": "Tobias Schultze",
+                    "email": "webmaster@tubo-world.de",
+                    "homepage": "https://github.com/Tobion"
                 }
             ],
             "description": "Guzzle promises library",
             "keywords": [
                 "promise"
             ],
-            "time": "2020-09-30T07:37:28+00:00"
+            "support": {
+                "issues": "https://github.com/guzzle/promises/issues",
+                "source": "https://github.com/guzzle/promises/tree/1.5.0"
+            },
+            "funding": [
+                {
+                    "url": "https://github.com/GrahamCampbell",
+                    "type": "github"
+                },
+                {
+                    "url": "https://github.com/Nyholm",
+                    "type": "github"
+                },
+                {
+                    "url": "https://tidelift.com/funding/github/packagist/guzzlehttp/promises",
+                    "type": "tidelift"
+                }
+            ],
+            "time": "2021-10-07T13:05:22+00:00"
         },
         {
             "name": "guzzlehttp/psr7",
-            "version": "1.7.0",
+            "version": "2.1.0",
             "source": {
                 "type": "git",
                 "url": "https://github.com/guzzle/psr7.git",
-                "reference": "53330f47520498c0ae1f61f7e2c90f55690c06a3"
+                "reference": "089edd38f5b8abba6cb01567c2a8aaa47cec4c72"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/guzzle/psr7/zipball/53330f47520498c0ae1f61f7e2c90f55690c06a3",
-                "reference": "53330f47520498c0ae1f61f7e2c90f55690c06a3",
+                "url": "https://api.github.com/repos/guzzle/psr7/zipball/089edd38f5b8abba6cb01567c2a8aaa47cec4c72",
+                "reference": "089edd38f5b8abba6cb01567c2a8aaa47cec4c72",
                 "shasum": ""
             },
             "require": {
-                "php": ">=5.4.0",
-                "psr/http-message": "~1.0",
-                "ralouphie/getallheaders": "^2.0.5 || ^3.0.0"
+                "php": "^7.2.5 || ^8.0",
+                "psr/http-factory": "^1.0",
+                "psr/http-message": "^1.0",
+                "ralouphie/getallheaders": "^3.0"
             },
             "provide": {
+                "psr/http-factory-implementation": "1.0",
                 "psr/http-message-implementation": "1.0"
             },
             "require-dev": {
-                "ext-zlib": "*",
-                "phpunit/phpunit": "~4.8.36 || ^5.7.27 || ^6.5.14 || ^7.5.20 || ^8.5.8 || ^9.3.10"
+                "bamarni/composer-bin-plugin": "^1.4.1",
+                "http-interop/http-factory-tests": "^0.9",
+                "phpunit/phpunit": "^8.5.8 || ^9.3.10"
             },
             "suggest": {
                 "laminas/laminas-httphandlerrunner": "Emit PSR-7 responses"
@@ -156,30 +228,53 @@
             "type": "library",
             "extra": {
                 "branch-alias": {
-                    "dev-master": "1.7-dev"
+                    "dev-master": "2.1-dev"
                 }
             },
             "autoload": {
                 "psr-4": {
                     "GuzzleHttp\\Psr7\\": "src/"
-                },
-                "files": [
-                    "src/functions_include.php"
-                ]
+                }
             },
             "notification-url": "https://packagist.org/downloads/",
             "license": [
                 "MIT"
             ],
             "authors": [
+                {
+                    "name": "Graham Campbell",
+                    "email": "hello@gjcampbell.co.uk",
+                    "homepage": "https://github.com/GrahamCampbell"
+                },
                 {
                     "name": "Michael Dowling",
                     "email": "mtdowling@gmail.com",
                     "homepage": "https://github.com/mtdowling"
                 },
+                {
+                    "name": "George Mponos",
+                    "email": "gmponos@gmail.com",
+                    "homepage": "https://github.com/gmponos"
+                },
+                {
+                    "name": "Tobias Nyholm",
+                    "email": "tobias.nyholm@gmail.com",
+                    "homepage": "https://github.com/Nyholm"
+                },
+                {
+                    "name": "Márk Sági-Kazár",
+                    "email": "mark.sagikazar@gmail.com",
+                    "homepage": "https://github.com/sagikazarmark"
+                },
                 {
                     "name": "Tobias Schultze",
+                    "email": "webmaster@tubo-world.de",
                     "homepage": "https://github.com/Tobion"
+                },
+                {
+                    "name": "Márk Sági-Kazár",
+                    "email": "mark.sagikazar@gmail.com",
+                    "homepage": "https://sagikazarmark.hu"
                 }
             ],
             "description": "PSR-7 message implementation that also provides common utility methods",
@@ -193,115 +288,43 @@
                 "uri",
                 "url"
             ],
-            "time": "2020-09-30T07:37:11+00:00"
-        },
-        {
-            "name": "kitetail/zttp",
-            "version": "v0.6.0",
-            "source": {
-                "type": "git",
-                "url": "https://github.com/kitetail/zttp.git",
-                "reference": "92662d7f9025b4c9a0b8a585e31810461fcca435"
+            "support": {
+                "issues": "https://github.com/guzzle/psr7/issues",
+                "source": "https://github.com/guzzle/psr7/tree/2.1.0"
             },
-            "dist": {
-                "type": "zip",
-                "url": "https://api.github.com/repos/kitetail/zttp/zipball/92662d7f9025b4c9a0b8a585e31810461fcca435",
-                "reference": "92662d7f9025b4c9a0b8a585e31810461fcca435",
-                "shasum": ""
-            },
-            "require": {
-                "guzzlehttp/guzzle": "^6.0",
-                "php": ">=7.0",
-                "tightenco/collect": "^5.4"
-            },
-            "require-dev": {
-                "laravel/lumen-framework": "5.5.*",
-                "phpunit/phpunit": "^6.0"
-            },
-            "type": "library",
-            "autoload": {
-                "files": [
-                    "src/Zttp.php"
-                ]
-            },
-            "notification-url": "https://packagist.org/downloads/",
-            "license": [
-                "MIT"
-            ],
-            "authors": [
+            "funding": [
                 {
-                    "name": "Adam Wathan",
-                    "email": "adam.wathan@gmail.com"
-                }
-            ],
-            "description": "A developer-experience focused HTTP client, optimized for most common use cases.",
-            "keywords": [
-                "Guzzle",
-                "http"
-            ],
-            "time": "2019-06-10T12:18:52+00:00"
-        },
-        {
-            "name": "paragonie/random_compat",
-            "version": "v9.99.99",
-            "source": {
-                "type": "git",
-                "url": "https://github.com/paragonie/random_compat.git",
-                "reference": "84b4dfb120c6f9b4ff7b3685f9b8f1aa365a0c95"
-            },
-            "dist": {
-                "type": "zip",
-                "url": "https://api.github.com/repos/paragonie/random_compat/zipball/84b4dfb120c6f9b4ff7b3685f9b8f1aa365a0c95",
-                "reference": "84b4dfb120c6f9b4ff7b3685f9b8f1aa365a0c95",
-                "shasum": ""
-            },
-            "require": {
-                "php": "^7"
-            },
-            "require-dev": {
-                "phpunit/phpunit": "4.*|5.*",
-                "vimeo/psalm": "^1"
-            },
-            "suggest": {
-                "ext-libsodium": "Provides a modern crypto API that can be used to generate random bytes."
-            },
-            "type": "library",
-            "notification-url": "https://packagist.org/downloads/",
-            "license": [
-                "MIT"
-            ],
-            "authors": [
+                    "url": "https://github.com/GrahamCampbell",
+                    "type": "github"
+                },
+                {
+                    "url": "https://github.com/Nyholm",
+                    "type": "github"
+                },
                 {
-                    "name": "Paragon Initiative Enterprises",
-                    "email": "security@paragonie.com",
-                    "homepage": "https://paragonie.com"
+                    "url": "https://tidelift.com/funding/github/packagist/guzzlehttp/psr7",
+                    "type": "tidelift"
                 }
             ],
-            "description": "PHP 5.x polyfill for random_bytes() and random_int() from PHP 7",
-            "keywords": [
-                "csprng",
-                "polyfill",
-                "pseudorandom",
-                "random"
-            ],
-            "time": "2018-07-02T15:55:56+00:00"
+            "time": "2021-10-06T17:43:30+00:00"
         },
         {
-            "name": "psr/http-message",
+            "name": "psr/http-client",
             "version": "1.0.1",
             "source": {
                 "type": "git",
-                "url": "https://github.com/php-fig/http-message.git",
-                "reference": "f6561bf28d520154e4b0ec72be95418abe6d9363"
+                "url": "https://github.com/php-fig/http-client.git",
+                "reference": "2dfb5f6c5eff0e91e20e913f8c5452ed95b86621"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/php-fig/http-message/zipball/f6561bf28d520154e4b0ec72be95418abe6d9363",
-                "reference": "f6561bf28d520154e4b0ec72be95418abe6d9363",
+                "url": "https://api.github.com/repos/php-fig/http-client/zipball/2dfb5f6c5eff0e91e20e913f8c5452ed95b86621",
+                "reference": "2dfb5f6c5eff0e91e20e913f8c5452ed95b86621",
                 "shasum": ""
             },
             "require": {
-                "php": ">=5.3.0"
+                "php": "^7.0 || ^8.0",
+                "psr/http-message": "^1.0"
             },
             "type": "library",
             "extra": {
@@ -311,7 +334,7 @@
             },
             "autoload": {
                 "psr-4": {
-                    "Psr\\Http\\Message\\": "src/"
+                    "Psr\\Http\\Client\\": "src/"
                 }
             },
             "notification-url": "https://packagist.org/downloads/",
@@ -324,98 +347,47 @@
                     "homepage": "http://www.php-fig.org/"
                 }
             ],
-            "description": "Common interface for HTTP messages",
-            "homepage": "https://github.com/php-fig/http-message",
+            "description": "Common interface for HTTP clients",
+            "homepage": "https://github.com/php-fig/http-client",
             "keywords": [
                 "http",
-                "http-message",
+                "http-client",
                 "psr",
-                "psr-7",
-                "request",
-                "response"
+                "psr-18"
             ],
-            "time": "2016-08-06T14:39:51+00:00"
-        },
-        {
-            "name": "ralouphie/getallheaders",
-            "version": "3.0.3",
-            "source": {
-                "type": "git",
-                "url": "https://github.com/ralouphie/getallheaders.git",
-                "reference": "120b605dfeb996808c31b6477290a714d356e822"
-            },
-            "dist": {
-                "type": "zip",
-                "url": "https://api.github.com/repos/ralouphie/getallheaders/zipball/120b605dfeb996808c31b6477290a714d356e822",
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-                "shasum": ""
-            },
-            "require": {
-                "php": ">=5.6"
-            },
-            "require-dev": {
-                "php-coveralls/php-coveralls": "^2.1",
-                "phpunit/phpunit": "^5 || ^6.5"
-            },
-            "type": "library",
-            "autoload": {
-                "files": [
-                    "src/getallheaders.php"
-                ]
+            "support": {
+                "source": "https://github.com/php-fig/http-client/tree/master"
             },
-            "notification-url": "https://packagist.org/downloads/",
-            "license": [
-                "MIT"
-            ],
-            "authors": [
-                {
-                    "name": "Ralph Khattar",
-                    "email": "ralph.khattar@gmail.com"
-                }
-            ],
-            "description": "A polyfill for getallheaders.",
-            "time": "2019-03-08T08:55:37+00:00"
+            "time": "2020-06-29T06:28:15+00:00"
         },
         {
-            "name": "symfony/polyfill-intl-idn",
-            "version": "v1.18.1",
+            "name": "psr/http-factory",
+            "version": "1.0.1",
             "source": {
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-                "url": "https://github.com/symfony/polyfill-intl-idn.git",
-                "reference": "5dcab1bc7146cf8c1beaa4502a3d9be344334251"
+                "url": "https://github.com/php-fig/http-factory.git",
+                "reference": "12ac7fcd07e5b077433f5f2bee95b3a771bf61be"
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             "dist": {
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-                "reference": "5dcab1bc7146cf8c1beaa4502a3d9be344334251",
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+                "reference": "12ac7fcd07e5b077433f5f2bee95b3a771bf61be",
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             },
             "require": {
-                "php": ">=5.3.3",
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-                "symfony/polyfill-php70": "^1.10",
-                "symfony/polyfill-php72": "^1.10"
-            },
-            "suggest": {
-                "ext-intl": "For best performance"
+                "php": ">=7.0.0",
+                "psr/http-message": "^1.0"
             },
             "type": "library",
             "extra": {
                 "branch-alias": {
-                    "dev-master": "1.18-dev"
-                },
-                "thanks": {
-                    "name": "symfony/polyfill",
-                    "url": "https://github.com/symfony/polyfill"
+                    "dev-master": "1.0.x-dev"
                 }
             },
             "autoload": {
                 "psr-4": {
-                    "Symfony\\Polyfill\\Intl\\Idn\\": ""
-                },
-                "files": [
-                    "bootstrap.php"
-                ]
+                    "Psr\\Http\\Message\\": "src/"
+                }
             },
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             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/symfony/polyfill-ctype/zipball/1c302646f6efc070cd46856e600e5e0684d6b454",
-                "reference": "1c302646f6efc070cd46856e600e5e0684d6b454",
+                "url": "https://api.github.com/repos/symfony/polyfill-ctype/zipball/46cd95797e9df938fdd2b03693b5fca5e64b01ce",
+                "reference": "46cd95797e9df938fdd2b03693b5fca5e64b01ce",
                 "shasum": ""
             },
             "require": {
-                "php": ">=5.3.3"
+                "php": ">=7.1"
             },
             "suggest": {
                 "ext-ctype": "For best performance"
@@ -2403,7 +2442,7 @@
             "type": "library",
             "extra": {
                 "branch-alias": {
-                    "dev-master": "1.18-dev"
+                    "dev-main": "1.23-dev"
                 },
                 "thanks": {
                     "name": "symfony/polyfill",
@@ -2440,6 +2479,9 @@
                 "polyfill",
                 "portable"
             ],
+            "support": {
+                "source": "https://github.com/symfony/polyfill-ctype/tree/v1.23.0"
+            },
             "funding": [
                 {
                     "url": "https://symfony.com/sponsor",
@@ -2454,20 +2496,20 @@
                     "type": "tidelift"
                 }
             ],
-            "time": "2020-07-14T12:35:20+00:00"
+            "time": "2021-02-19T12:13:01+00:00"
         },
         {
             "name": "theseer/tokenizer",
-            "version": "1.2.0",
+            "version": "1.2.1",
             "source": {
                 "type": "git",
                 "url": "https://github.com/theseer/tokenizer.git",
-                "reference": "75a63c33a8577608444246075ea0af0d052e452a"
+                "reference": "34a41e998c2183e22995f158c581e7b5e755ab9e"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/theseer/tokenizer/zipball/75a63c33a8577608444246075ea0af0d052e452a",
-                "reference": "75a63c33a8577608444246075ea0af0d052e452a",
+                "url": "https://api.github.com/repos/theseer/tokenizer/zipball/34a41e998c2183e22995f158c581e7b5e755ab9e",
+                "reference": "34a41e998c2183e22995f158c581e7b5e755ab9e",
                 "shasum": ""
             },
             "require": {
@@ -2494,26 +2536,30 @@
                 }
             ],
             "description": "A small library for converting tokenized PHP source code into XML and potentially other formats",
+            "support": {
+                "issues": "https://github.com/theseer/tokenizer/issues",
+                "source": "https://github.com/theseer/tokenizer/tree/1.2.1"
+            },
             "funding": [
                 {
                     "url": "https://github.com/theseer",
                     "type": "github"
                 }
             ],
-            "time": "2020-07-12T23:59:07+00:00"
+            "time": "2021-07-28T10:34:58+00:00"
         },
         {
             "name": "vlucas/phpdotenv",
-            "version": "v2.6.6",
+            "version": "v2.6.8",
             "source": {
                 "type": "git",
                 "url": "https://github.com/vlucas/phpdotenv.git",
-                "reference": "e1d57f62db3db00d9139078cbedf262280701479"
+                "reference": "f1e2a35e53abe9322f0ab9ada689967e30055d40"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/vlucas/phpdotenv/zipball/e1d57f62db3db00d9139078cbedf262280701479",
-                "reference": "e1d57f62db3db00d9139078cbedf262280701479",
+                "url": "https://api.github.com/repos/vlucas/phpdotenv/zipball/f1e2a35e53abe9322f0ab9ada689967e30055d40",
+                "reference": "f1e2a35e53abe9322f0ab9ada689967e30055d40",
                 "shasum": ""
             },
             "require": {
@@ -2523,7 +2569,7 @@
             "require-dev": {
                 "ext-filter": "*",
                 "ext-pcre": "*",
-                "phpunit/phpunit": "^4.8.35 || ^5.7.27"
+                "phpunit/phpunit": "^4.8.36 || ^5.7.27 || ^6.5.14 || ^7.5.20 || ^8.5.21"
             },
             "suggest": {
                 "ext-filter": "Required to use the boolean validator.",
@@ -2547,13 +2593,11 @@
             "authors": [
                 {
                     "name": "Graham Campbell",
-                    "email": "graham@alt-three.com",
-                    "homepage": "https://gjcampbell.co.uk/"
+                    "email": "hello@gjcampbell.co.uk"
                 },
                 {
                     "name": "Vance Lucas",
-                    "email": "vance@vancelucas.com",
-                    "homepage": "https://vancelucas.com/"
+                    "email": "vance@vancelucas.com"
                 }
             ],
             "description": "Loads environment variables from `.env` to `getenv()`, `$_ENV` and `$_SERVER` automagically.",
@@ -2562,6 +2606,10 @@
                 "env",
                 "environment"
             ],
+            "support": {
+                "issues": "https://github.com/vlucas/phpdotenv/issues",
+                "source": "https://github.com/vlucas/phpdotenv/tree/v2.6.8"
+            },
             "funding": [
                 {
                     "url": "https://github.com/GrahamCampbell",
@@ -2572,34 +2620,39 @@
                     "type": "tidelift"
                 }
             ],
-            "time": "2020-07-14T17:54:18+00:00"
+            "time": "2021-10-02T19:02:17+00:00"
         },
         {
             "name": "webmozart/assert",
-            "version": "1.9.1",
+            "version": "1.10.0",
             "source": {
                 "type": "git",
-                "url": "https://github.com/webmozart/assert.git",
-                "reference": "bafc69caeb4d49c39fd0779086c03a3738cbb389"
+                "url": "https://github.com/webmozarts/assert.git",
+                "reference": "6964c76c7804814a842473e0c8fd15bab0f18e25"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/webmozart/assert/zipball/bafc69caeb4d49c39fd0779086c03a3738cbb389",
-                "reference": "bafc69caeb4d49c39fd0779086c03a3738cbb389",
+                "url": "https://api.github.com/repos/webmozarts/assert/zipball/6964c76c7804814a842473e0c8fd15bab0f18e25",
+                "reference": "6964c76c7804814a842473e0c8fd15bab0f18e25",
                 "shasum": ""
             },
             "require": {
-                "php": "^5.3.3 || ^7.0 || ^8.0",
+                "php": "^7.2 || ^8.0",
                 "symfony/polyfill-ctype": "^1.8"
             },
             "conflict": {
                 "phpstan/phpstan": "<0.12.20",
-                "vimeo/psalm": "<3.9.1"
+                "vimeo/psalm": "<4.6.1 || 4.6.2"
             },
             "require-dev": {
-                "phpunit/phpunit": "^4.8.36 || ^7.5.13"
+                "phpunit/phpunit": "^8.5.13"
             },
             "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "1.10-dev"
+                }
+            },
             "autoload": {
                 "psr-4": {
                     "Webmozart\\Assert\\": "src/"
@@ -2621,7 +2674,11 @@
                 "check",
                 "validate"
             ],
-            "time": "2020-07-08T17:02:28+00:00"
+            "support": {
+                "issues": "https://github.com/webmozarts/assert/issues",
+                "source": "https://github.com/webmozarts/assert/tree/1.10.0"
+            },
+            "time": "2021-03-09T10:59:23+00:00"
         }
     ],
     "aliases": [],
@@ -2633,5 +2690,5 @@
         "php": ">=7.0"
     },
     "platform-dev": [],
-    "plugin-api-version": "1.1.0"
+    "plugin-api-version": "2.1.0"
 }
diff --git a/src/FbFeed.php b/src/FbFeed.php
index 5225e93..53f95e3 100644
--- a/src/FbFeed.php
+++ b/src/FbFeed.php
@@ -6,7 +6,8 @@
  */
 namespace Xmhafiz\FbFeed;
 
-use Zttp\Zttp;
+
+use GuzzleHttp\Client;
 
 class FbFeed {
 
@@ -57,10 +58,15 @@ function setAppId($app_id) : FbFeed
      * @param $secret_key
      * @return FbFeed
      */
-    function setCredential($app_id, $secret_key)  : FbFeed
+    function setCredential($app_id, $secret_key = null)  : FbFeed
     {
-        $this->app_id = $app_id;
-        $this->secret_key = $secret_key;
+        if ($secret_key != null) {
+            $this->app_id = $app_id;
+            $this->secret_key = $secret_key;
+        } else {
+            $this->access_token = $app_id;
+        }
+
         return $this;
     }
 
@@ -187,14 +193,17 @@ function fetch() {
             $data['locale'] = $this->locale;
         }
 
+        $client = new Client();
 
         // start request
-        $response = Zttp::withHeaders($this->headers)
-            ->get("https://graph.facebook.com/{$this->page_name}/{$this->module}", $data);
+        $response = $client->request('GET', "https://graph.facebook.com/{$this->page_name}/{$this->module}", [
+            'query' => $data,
+            'headers' => $this->headers
+        ]);
 
-        if ($response->isOk()) {
+        if ($response->getStatusCode() >= 200  && $response->getStatusCode() < 300) {
 
-            $feeds = $response->json()['data'];
+            $feeds = json_decode($response->getBody(), true)['data'];
 
             if ($this->keyword) {
                 $newFeeds = [];
diff --git a/tests/RequestTest.php b/tests/RequestTest.php
index c4a0526..419f0a4 100644
--- a/tests/RequestTest.php
+++ b/tests/RequestTest.php
@@ -5,7 +5,6 @@
 
 use Dotenv\Dotenv;
 use PHPUnit\Framework\TestCase;
-use Xmhafiz\FbFeed\Request;
 /**
 * RequestTest.php
 * to test function in Request class
@@ -13,10 +12,9 @@
 class RequestTest extends TestCase
 {
 	protected $fbPageName;
-	protected $fbAppId;
-	protected $fbSecretKey;
+	protected $fbAccessToken;
 
-	protected function setUp() 
+	protected function setUp() :void
 	{
 		try {
 			$env = new Dotenv(__DIR__ . '/../');
@@ -27,8 +25,7 @@ protected function setUp()
 		}
 
 		// set page
-		$this->fbSecretKey =  getenv('FB_SECRET_KEY');
-		$this->fbAppId = getenv('FB_APP_ID');
+        $this->fbAccessToken = getenv('FB_ACCESS_TOKEN');
 		$this->fbPageName = getenv('FB_PAGENAME');
 	}
 
@@ -49,8 +46,7 @@ function testGetPageFeedWithEnv()
     {
         // check default feed request
         $response = fb_feed()
-            ->setAppId($this->fbAppId)
-            ->setSecretKey($this->fbSecretKey)
+            ->setAccessToken($this->fbAccessToken)
             ->setPage($this->fbPageName)
             ->fetch();
 
@@ -64,8 +60,7 @@ function testGetPageFeedSuccess()
 	{
 		// check default feed request
 		$response = fb_feed()
-            ->setAppId($this->fbAppId)
-            ->setSecretKey($this->fbSecretKey)
+            ->setAccessToken($this->fbAccessToken)
             ->setPage($this->fbPageName)
             ->fetch();
 
@@ -79,7 +74,7 @@ function testGetPageFeedUsingConstructorSuccess()
     {
         // check default feed request
         $response = fb_feed()
-            ->setCredential($this->fbAppId, $this->fbSecretKey)
+            ->setCredential($this->fbAccessToken)
             ->setPage($this->fbPageName)
             ->fetch();
 
@@ -93,8 +88,7 @@ function testGetPageFeedLimitFivePost()
 	{
 		// feed request with maximum 5 post
         $response = fb_feed()
-            ->setAppId($this->fbAppId)
-            ->setSecretKey($this->fbSecretKey)
+            ->setAccessToken($this->fbAccessToken)
             ->setPage($this->fbPageName)
             ->feedLimit(5)
             ->fetch();
@@ -109,8 +103,7 @@ function testGetPageFeedEmptyPageNameFailed()
 	{
 		// make pagename empty
         $response = fb_feed()
-            ->setAppId($this->fbAppId)
-            ->setSecretKey($this->fbSecretKey)
+            ->setAccessToken($this->fbAccessToken)
             ->setPage(null)
             ->fetch();
 
@@ -124,8 +117,7 @@ function testGetPageFeedByKeywordSuccess()
     {
         // by keyword
         $response = fb_feed()
-            ->setAppId($this->fbAppId)
-            ->setSecretKey($this->fbSecretKey)
+            ->setAccessToken($this->fbAccessToken)
             ->setPage($this->fbPageName)
             ->findKeyword("#tutorial")
             ->fetch();
@@ -140,8 +132,7 @@ function testGetPageFeedByKeywordArraySuccess()
     {
         // by array of keywords
         $response = fb_feed()
-            ->setAppId($this->fbAppId)
-            ->setSecretKey($this->fbSecretKey)
+            ->setAccessToken($this->fbAccessToken)
             ->setPage($this->fbPageName)
             ->findKeyword(['#tutorial', '#laravel'])
             ->fetch();