diff --git a/README.md b/README.md
index bd16362..f48dca9 100644
--- a/README.md
+++ b/README.md
@@ -3,14 +3,14 @@ PHP library to perform product lookup and searches using the Amazon Product API.
 
 ## Installation
 
-This library requires the [SimpleXML](http://php.net/manual/en/book.simplexml.php) and [Curl](http://php.net/manual/en/book.curl.php) extensions to be installed and uses PHP 7+ . Installation is simple using [Composer](https://composer.io):
+This library requires the [SimpleXML](http://php.net/manual/en/book.simplexml.php) and [Curl](http://php.net/manual/en/book.curl.php) extensions to be installed and uses PHP 7+ . Installation is simple using [Composer](https://getcomposer.org/):
 
 ```shell
 composer require marcl/amazonproductapi
 ```
 
 ### Amazon Product API
-It also assumes that you have some basic knowledge of Amazon's Product API and have set up an Amazon Associate account see: [Amazon Product API Set Up](http://docs.amazonwebservices.com/AWSECommerceService/2011-08-01/GSG/GettingSetUp.html).
+It also assumes that you have some basic knowledge of Amazon's Product API and have set up an Amazon Associate account see: [Amazon Product API Set Up](https://webservices.amazon.com/paapi5/documentation/register-for-pa-api.html).
 
 You'll need an AWS key, secret key, and associate tag. Ensure that you keep these safe!
 
diff --git a/composer.json b/composer.json
index b8b4ee2..10c20ff 100644
--- a/composer.json
+++ b/composer.json
@@ -1,8 +1,7 @@
 {
     "name": "marcl/amazonproductapi",
     "description":
-        "PHP library to perform product lookup and searches using the Amazon Product API.",
-    "version": "3.0.2",
+        "PHP library to perform product lookup and searches using the Amazon Product Advertising API 5.0.",
     "type": "library",
     "keywords": ["amazon", "product", "api"],
     "homepage": "https://github.com/MarcL/AmazonProductAPI/",
@@ -20,7 +19,8 @@
         "issues": "https://github.com/MarcL/AmazonProductAPI/issues"
     },
     "require-dev": {
-        "phpunit/phpunit": "6.1.*"
+        "php": ">=7.3.0",
+        "phpunit/phpunit": "^9"
     },
     "autoload": {
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diff --git a/composer.lock b/composer.lock
index 950cd5b..c40b296 100644
--- a/composer.lock
+++ b/composer.lock
@@ -1,40 +1,42 @@
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-        "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",
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@@ -54,46 +56,52 @@
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+            "homepage": "https://www.doctrine-project.org/projects/instantiator.html",
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-            "time": "2015-06-14T21:17:01+00:00"
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+                "php": "^7.1"
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+                "doctrine/collections": "^1.0",
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@@ -101,26 +109,26 @@
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-            "time": "2017-04-12T18:52:22+00:00"
+            "time": "2020-01-17T21:11:47+00:00"
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@@ -156,20 +164,20 @@
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             ],
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-            "time": "2017-03-05T18:14:27+00:00"
+            "time": "2018-07-08T19:23:20+00:00"
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@@ -203,39 +211,37 @@
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@@ -257,38 +263,42 @@
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@@ -299,44 +309,46 @@
                 {
                     "name": "Mike van Riel",
                     "email": "me@mikevanriel.com"
+                },
+                {
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+                    "email": "account@ijaap.nl"
                 }
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             "description": "With this component, a library can provide support for annotations via DocBlocks or otherwise retrieve information that is embedded in a DocBlock.",
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+            "time": "2020-02-22T12:28:44+00:00"
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@@ -349,42 +361,43 @@
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             ],
-            "time": "2016-11-25T06:54:22+00:00"
+            "description": "A PSR-5 based resolver of Class names, Types and Structural Element Names",
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-                "sebastian/comparator": "^1.1|^2.0",
-                "sebastian/recursion-context": "^1.0|^2.0|^3.0"
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+                "phpspec/phpspec": "^2.5 || ^3.2",
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+                "psr-4": {
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@@ -412,45 +425,45 @@
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@@ -465,7 +478,7 @@
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+                    "email": "sebastian@phpunit.de",
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@@ -476,29 +489,32 @@
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-                "phpunit/phpunit": "^6.1"
+                "phpunit/phpunit": "^9.0"
+            },
+            "suggest": {
+                "ext-posix": "*"
             },
             "type": "library",
             "extra": {
                 "branch-alias": {
-                    "dev-master": "3.1.x-dev"
+                    "dev-master": "5.0-dev"
                 }
             },
             "autoload": {
@@ -1016,34 +1040,34 @@
                 "environment",
                 "hhvm"
             ],
-            "time": "2017-07-01T08:51:00+00:00"
+            "time": "2020-02-19T13:40:20+00:00"
         },
         {
             "name": "sebastian/exporter",
-            "version": "3.1.0",
+            "version": "4.0.0",
             "source": {
                 "type": "git",
                 "url": "https://github.com/sebastianbergmann/exporter.git",
-                "reference": "234199f4528de6d12aaa58b612e98f7d36adb937"
+                "reference": "80c26562e964016538f832f305b2286e1ec29566"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/sebastianbergmann/exporter/zipball/234199f4528de6d12aaa58b612e98f7d36adb937",
-                "reference": "234199f4528de6d12aaa58b612e98f7d36adb937",
+                "url": "https://api.github.com/repos/sebastianbergmann/exporter/zipball/80c26562e964016538f832f305b2286e1ec29566",
+                "reference": "80c26562e964016538f832f305b2286e1ec29566",
                 "shasum": ""
             },
             "require": {
-                "php": "^7.0",
-                "sebastian/recursion-context": "^3.0"
+                "php": "^7.3",
+                "sebastian/recursion-context": "^4.0"
             },
             "require-dev": {
                 "ext-mbstring": "*",
-                "phpunit/phpunit": "^6.0"
+                "phpunit/phpunit": "^9.0"
             },
             "type": "library",
             "extra": {
                 "branch-alias": {
-                    "dev-master": "3.1.x-dev"
+                    "dev-master": "4.0-dev"
                 }
             },
             "autoload": {
@@ -1056,6 +1080,10 @@
                 "BSD-3-Clause"
             ],
             "authors": [
+                {
+                    "name": "Sebastian Bergmann",
+                    "email": "sebastian@phpunit.de"
+                },
                 {
                     "name": "Jeff Welch",
                     "email": "whatthejeff@gmail.com"
@@ -1064,17 +1092,13 @@
                     "name": "Volker Dusch",
                     "email": "github@wallbash.com"
                 },
-                {
-                    "name": "Bernhard Schussek",
-                    "email": "bschussek@2bepublished.at"
-                },
-                {
-                    "name": "Sebastian Bergmann",
-                    "email": "sebastian@phpunit.de"
-                },
                 {
                     "name": "Adam Harvey",
                     "email": "aharvey@php.net"
+                },
+                {
+                    "name": "Bernhard Schussek",
+                    "email": "bschussek@gmail.com"
                 }
             ],
             "description": "Provides the functionality to export PHP variables for visualization",
@@ -1083,27 +1107,30 @@
                 "export",
                 "exporter"
             ],
-            "time": "2017-04-03T13:19:02+00:00"
+            "time": "2020-02-07T06:10:52+00:00"
         },
         {
             "name": "sebastian/global-state",
-            "version": "2.0.0",
+            "version": "4.0.0",
             "source": {
                 "type": "git",
                 "url": "https://github.com/sebastianbergmann/global-state.git",
-                "reference": "e8ba02eed7bbbb9e59e43dedd3dddeff4a56b0c4"
+                "reference": "bdb1e7c79e592b8c82cb1699be3c8743119b8a72"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/sebastianbergmann/global-state/zipball/e8ba02eed7bbbb9e59e43dedd3dddeff4a56b0c4",
-                "reference": "e8ba02eed7bbbb9e59e43dedd3dddeff4a56b0c4",
+                "url": "https://api.github.com/repos/sebastianbergmann/global-state/zipball/bdb1e7c79e592b8c82cb1699be3c8743119b8a72",
+                "reference": "bdb1e7c79e592b8c82cb1699be3c8743119b8a72",
                 "shasum": ""
             },
             "require": {
-                "php": "^7.0"
+                "php": "^7.3",
+                "sebastian/object-reflector": "^2.0",
+                "sebastian/recursion-context": "^4.0"
             },
             "require-dev": {
-                "phpunit/phpunit": "^6.0"
+                "ext-dom": "*",
+                "phpunit/phpunit": "^9.0"
             },
             "suggest": {
                 "ext-uopz": "*"
@@ -1111,7 +1138,7 @@
             "type": "library",
             "extra": {
                 "branch-alias": {
-                    "dev-master": "2.0-dev"
+                    "dev-master": "4.0-dev"
                 }
             },
             "autoload": {
@@ -1134,34 +1161,34 @@
             "keywords": [
                 "global state"
             ],
-            "time": "2017-04-27T15:39:26+00:00"
+            "time": "2020-02-07T06:11:37+00:00"
         },
         {
             "name": "sebastian/object-enumerator",
-            "version": "3.0.2",
+            "version": "4.0.0",
             "source": {
                 "type": "git",
                 "url": "https://github.com/sebastianbergmann/object-enumerator.git",
-                "reference": "31dd3379d16446c5d86dec32ab1ad1f378581ad8"
+                "reference": "e67516b175550abad905dc952f43285957ef4363"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/sebastianbergmann/object-enumerator/zipball/31dd3379d16446c5d86dec32ab1ad1f378581ad8",
-                "reference": "31dd3379d16446c5d86dec32ab1ad1f378581ad8",
+                "url": "https://api.github.com/repos/sebastianbergmann/object-enumerator/zipball/e67516b175550abad905dc952f43285957ef4363",
+                "reference": "e67516b175550abad905dc952f43285957ef4363",
                 "shasum": ""
             },
             "require": {
-                "php": "^7.0",
-                "sebastian/object-reflector": "^1.0",
-                "sebastian/recursion-context": "^3.0"
+                "php": "^7.3",
+                "sebastian/object-reflector": "^2.0",
+                "sebastian/recursion-context": "^4.0"
             },
             "require-dev": {
-                "phpunit/phpunit": "^6.0"
+                "phpunit/phpunit": "^9.0"
             },
             "type": "library",
             "extra": {
                 "branch-alias": {
-                    "dev-master": "3.0.x-dev"
+                    "dev-master": "4.0-dev"
                 }
             },
             "autoload": {
@@ -1181,32 +1208,32 @@
             ],
             "description": "Traverses array structures and object graphs to enumerate all referenced objects",
             "homepage": "https://github.com/sebastianbergmann/object-enumerator/",
-            "time": "2017-03-12T15:17:29+00:00"
+            "time": "2020-02-07T06:12:23+00:00"
         },
         {
             "name": "sebastian/object-reflector",
-            "version": "1.1.1",
+            "version": "2.0.0",
             "source": {
                 "type": "git",
                 "url": "https://github.com/sebastianbergmann/object-reflector.git",
-                "reference": "773f97c67f28de00d397be301821b06708fca0be"
+                "reference": "f4fd0835cabb0d4a6546d9fe291e5740037aa1e7"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/sebastianbergmann/object-reflector/zipball/773f97c67f28de00d397be301821b06708fca0be",
-                "reference": "773f97c67f28de00d397be301821b06708fca0be",
+                "url": "https://api.github.com/repos/sebastianbergmann/object-reflector/zipball/f4fd0835cabb0d4a6546d9fe291e5740037aa1e7",
+                "reference": "f4fd0835cabb0d4a6546d9fe291e5740037aa1e7",
                 "shasum": ""
             },
             "require": {
-                "php": "^7.0"
+                "php": "^7.3"
             },
             "require-dev": {
-                "phpunit/phpunit": "^6.0"
+                "phpunit/phpunit": "^9.0"
             },
             "type": "library",
             "extra": {
                 "branch-alias": {
-                    "dev-master": "1.1-dev"
+                    "dev-master": "2.0-dev"
                 }
             },
             "autoload": {
@@ -1226,32 +1253,32 @@
             ],
             "description": "Allows reflection of object attributes, including inherited and non-public ones",
             "homepage": "https://github.com/sebastianbergmann/object-reflector/",
-            "time": "2017-03-29T09:07:27+00:00"
+            "time": "2020-02-07T06:19:40+00:00"
         },
         {
             "name": "sebastian/recursion-context",
-            "version": "3.0.0",
+            "version": "4.0.0",
             "source": {
                 "type": "git",
                 "url": "https://github.com/sebastianbergmann/recursion-context.git",
-                "reference": "5b0cd723502bac3b006cbf3dbf7a1e3fcefe4fa8"
+                "reference": "cdd86616411fc3062368b720b0425de10bd3d579"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/sebastianbergmann/recursion-context/zipball/5b0cd723502bac3b006cbf3dbf7a1e3fcefe4fa8",
-                "reference": "5b0cd723502bac3b006cbf3dbf7a1e3fcefe4fa8",
+                "url": "https://api.github.com/repos/sebastianbergmann/recursion-context/zipball/cdd86616411fc3062368b720b0425de10bd3d579",
+                "reference": "cdd86616411fc3062368b720b0425de10bd3d579",
                 "shasum": ""
             },
             "require": {
-                "php": "^7.0"
+                "php": "^7.3"
             },
             "require-dev": {
-                "phpunit/phpunit": "^6.0"
+                "phpunit/phpunit": "^9.0"
             },
             "type": "library",
             "extra": {
                 "branch-alias": {
-                    "dev-master": "3.0.x-dev"
+                    "dev-master": "4.0-dev"
                 }
             },
             "autoload": {
@@ -1264,14 +1291,14 @@
                 "BSD-3-Clause"
             ],
             "authors": [
-                {
-                    "name": "Jeff Welch",
-                    "email": "whatthejeff@gmail.com"
-                },
                 {
                     "name": "Sebastian Bergmann",
                     "email": "sebastian@phpunit.de"
                 },
+                {
+                    "name": "Jeff Welch",
+                    "email": "whatthejeff@gmail.com"
+                },
                 {
                     "name": "Adam Harvey",
                     "email": "aharvey@php.net"
@@ -1279,29 +1306,32 @@
             ],
             "description": "Provides functionality to recursively process PHP variables",
             "homepage": "http://www.github.com/sebastianbergmann/recursion-context",
-            "time": "2017-03-03T06:23:57+00:00"
+            "time": "2020-02-07T06:18:20+00:00"
         },
         {
             "name": "sebastian/resource-operations",
-            "version": "1.0.0",
+            "version": "3.0.0",
             "source": {
                 "type": "git",
                 "url": "https://github.com/sebastianbergmann/resource-operations.git",
-                "reference": "ce990bb21759f94aeafd30209e8cfcdfa8bc3f52"
+                "reference": "8c98bf0dfa1f9256d0468b9803a1e1df31b6fa98"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/sebastianbergmann/resource-operations/zipball/ce990bb21759f94aeafd30209e8cfcdfa8bc3f52",
-                "reference": "ce990bb21759f94aeafd30209e8cfcdfa8bc3f52",
+                "url": "https://api.github.com/repos/sebastianbergmann/resource-operations/zipball/8c98bf0dfa1f9256d0468b9803a1e1df31b6fa98",
+                "reference": "8c98bf0dfa1f9256d0468b9803a1e1df31b6fa98",
                 "shasum": ""
             },
             "require": {
-                "php": ">=5.6.0"
+                "php": "^7.3"
+            },
+            "require-dev": {
+                "phpunit/phpunit": "^9.0"
             },
             "type": "library",
             "extra": {
                 "branch-alias": {
-                    "dev-master": "1.0.x-dev"
+                    "dev-master": "3.0-dev"
                 }
             },
             "autoload": {
@@ -1321,29 +1351,75 @@
             ],
             "description": "Provides a list of PHP built-in functions that operate on resources",
             "homepage": "https://www.github.com/sebastianbergmann/resource-operations",
-            "time": "2015-07-28T20:34:47+00:00"
+            "time": "2020-02-07T06:13:02+00:00"
+        },
+        {
+            "name": "sebastian/type",
+            "version": "2.0.0",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/sebastianbergmann/type.git",
+                "reference": "9e8f42f740afdea51f5f4e8cec2035580e797ee1"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/sebastianbergmann/type/zipball/9e8f42f740afdea51f5f4e8cec2035580e797ee1",
+                "reference": "9e8f42f740afdea51f5f4e8cec2035580e797ee1",
+                "shasum": ""
+            },
+            "require": {
+                "php": "^7.3"
+            },
+            "require-dev": {
+                "phpunit/phpunit": "^9.0"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "2.0-dev"
+                }
+            },
+            "autoload": {
+                "classmap": [
+                    "src/"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "BSD-3-Clause"
+            ],
+            "authors": [
+                {
+                    "name": "Sebastian Bergmann",
+                    "email": "sebastian@phpunit.de",
+                    "role": "lead"
+                }
+            ],
+            "description": "Collection of value objects that represent the types of the PHP type system",
+            "homepage": "https://github.com/sebastianbergmann/type",
+            "time": "2020-02-07T06:13:43+00:00"
         },
         {
             "name": "sebastian/version",
-            "version": "2.0.1",
+            "version": "3.0.0",
             "source": {
                 "type": "git",
                 "url": "https://github.com/sebastianbergmann/version.git",
-                "reference": "99732be0ddb3361e16ad77b68ba41efc8e979019"
+                "reference": "0411bde656dce64202b39c2f4473993a9081d39e"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/sebastianbergmann/version/zipball/99732be0ddb3361e16ad77b68ba41efc8e979019",
-                "reference": "99732be0ddb3361e16ad77b68ba41efc8e979019",
+                "url": "https://api.github.com/repos/sebastianbergmann/version/zipball/0411bde656dce64202b39c2f4473993a9081d39e",
+                "reference": "0411bde656dce64202b39c2f4473993a9081d39e",
                 "shasum": ""
             },
             "require": {
-                "php": ">=5.6"
+                "php": "^7.3"
             },
             "type": "library",
             "extra": {
                 "branch-alias": {
-                    "dev-master": "2.0.x-dev"
+                    "dev-master": "3.0-dev"
                 }
             },
             "autoload": {
@@ -1364,20 +1440,78 @@
             ],
             "description": "Library that helps with managing the version number of Git-hosted PHP projects",
             "homepage": "https://github.com/sebastianbergmann/version",
-            "time": "2016-10-03T07:35:21+00:00"
+            "time": "2020-01-21T06:36:37+00:00"
+        },
+        {
+            "name": "symfony/polyfill-ctype",
+            "version": "v1.14.0",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/symfony/polyfill-ctype.git",
+                "reference": "fbdeaec0df06cf3d51c93de80c7eb76e271f5a38"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/symfony/polyfill-ctype/zipball/fbdeaec0df06cf3d51c93de80c7eb76e271f5a38",
+                "reference": "fbdeaec0df06cf3d51c93de80c7eb76e271f5a38",
+                "shasum": ""
+            },
+            "require": {
+                "php": ">=5.3.3"
+            },
+            "suggest": {
+                "ext-ctype": "For best performance"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "1.14-dev"
+                }
+            },
+            "autoload": {
+                "psr-4": {
+                    "Symfony\\Polyfill\\Ctype\\": ""
+                },
+                "files": [
+                    "bootstrap.php"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "authors": [
+                {
+                    "name": "Gert de Pagter",
+                    "email": "BackEndTea@gmail.com"
+                },
+                {
+                    "name": "Symfony Community",
+                    "homepage": "https://symfony.com/contributors"
+                }
+            ],
+            "description": "Symfony polyfill for ctype functions",
+            "homepage": "https://symfony.com",
+            "keywords": [
+                "compatibility",
+                "ctype",
+                "polyfill",
+                "portable"
+            ],
+            "time": "2020-01-13T11:15:53+00:00"
         },
         {
             "name": "theseer/tokenizer",
-            "version": "1.1.0",
+            "version": "1.1.3",
             "source": {
                 "type": "git",
                 "url": "https://github.com/theseer/tokenizer.git",
-                "reference": "cb2f008f3f05af2893a87208fe6a6c4985483f8b"
+                "reference": "11336f6f84e16a720dae9d8e6ed5019efa85a0f9"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/theseer/tokenizer/zipball/cb2f008f3f05af2893a87208fe6a6c4985483f8b",
-                "reference": "cb2f008f3f05af2893a87208fe6a6c4985483f8b",
+                "url": "https://api.github.com/repos/theseer/tokenizer/zipball/11336f6f84e16a720dae9d8e6ed5019efa85a0f9",
+                "reference": "11336f6f84e16a720dae9d8e6ed5019efa85a0f9",
                 "shasum": ""
             },
             "require": {
@@ -1404,35 +1538,33 @@
                 }
             ],
             "description": "A small library for converting tokenized PHP source code into XML and potentially other formats",
-            "time": "2017-04-07T12:08:54+00:00"
+            "time": "2019-06-13T22:48:21+00:00"
         },
         {
             "name": "webmozart/assert",
-            "version": "1.2.0",
+            "version": "1.7.0",
             "source": {
                 "type": "git",
                 "url": "https://github.com/webmozart/assert.git",
-                "reference": "2db61e59ff05fe5126d152bd0655c9ea113e550f"
+                "reference": "aed98a490f9a8f78468232db345ab9cf606cf598"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/webmozart/assert/zipball/2db61e59ff05fe5126d152bd0655c9ea113e550f",
-                "reference": "2db61e59ff05fe5126d152bd0655c9ea113e550f",
+                "url": "https://api.github.com/repos/webmozart/assert/zipball/aed98a490f9a8f78468232db345ab9cf606cf598",
+                "reference": "aed98a490f9a8f78468232db345ab9cf606cf598",
                 "shasum": ""
             },
             "require": {
-                "php": "^5.3.3 || ^7.0"
+                "php": "^5.3.3 || ^7.0",
+                "symfony/polyfill-ctype": "^1.8"
+            },
+            "conflict": {
+                "vimeo/psalm": "<3.6.0"
             },
             "require-dev": {
-                "phpunit/phpunit": "^4.6",
-                "sebastian/version": "^1.0.1"
+                "phpunit/phpunit": "^4.8.36 || ^7.5.13"
             },
             "type": "library",
-            "extra": {
-                "branch-alias": {
-                    "dev-master": "1.3-dev"
-                }
-            },
             "autoload": {
                 "psr-4": {
                     "Webmozart\\Assert\\": "src/"
@@ -1454,7 +1586,7 @@
                 "check",
                 "validate"
             ],
-            "time": "2016-11-23T20:04:58+00:00"
+            "time": "2020-02-14T12:15:55+00:00"
         }
     ],
     "aliases": [],
@@ -1463,5 +1595,6 @@
     "prefer-stable": false,
     "prefer-lowest": false,
     "platform": [],
-    "platform-dev": []
+    "platform-dev": [],
+    "plugin-api-version": "1.1.0"
 }
diff --git a/examples.php b/examples.php
index 00d6886..d5d44e9 100644
--- a/examples.php
+++ b/examples.php
@@ -28,33 +28,33 @@
 print('>> Harry Potter in Books, sort by featured');
 var_dump($items);
 
-sleep($sleepTime);
+// sleep($sleepTime);
 
-// Harry Potter in Books, sort by price low to high
-$items = $amazonAPI->ItemSearch('harry potter', 'Books', 'price');
-print('>> Harry Potter in Books, sort by price low to high');
-var_dump($items);
+// // Harry Potter in Books, sort by price low to high
+// $items = $amazonAPI->ItemSearch('harry potter', 'Books', 'price');
+// print('>> Harry Potter in Books, sort by price low to high');
+// var_dump($items);
 
-sleep($sleepTime);
+// sleep($sleepTime);
 
-// Harry Potter in Books, sort by price high to low
-$items = $amazonAPI->ItemSearch('harry potter', 'Books', '-price');
-print('>> Harry Potter in Books, sort by price high to low');
-var_dump($items);
+// // Harry Potter in Books, sort by price high to low
+// $items = $amazonAPI->ItemSearch('harry potter', 'Books', '-price');
+// print('>> Harry Potter in Books, sort by price high to low');
+// var_dump($items);
 
-sleep($sleepTime);
+// sleep($sleepTime);
 
-// Amazon echo, lookup only with Amazon as a seller
-$items = $amazonAPI->ItemLookUp('B01GAGVIE4', true);
-print('>> Look up specific ASIN\n');
-var_dump($items);
+// // Amazon echo, lookup only with Amazon as a seller
+// $items = $amazonAPI->ItemLookUp('B01GAGVIE4', true);
+// print('>> Look up specific ASIN\n');
+// var_dump($items);
 
-sleep($sleepTime);
+// sleep($sleepTime);
 
-// Amazon echo, lookup with incorrect ASIN array
-$asinIds = array('INVALID', 'INVALIDASIN', 'NOTANASIN');
-$items = $amazonAPI->ItemLookUp($asinIds, true);
-print('>> Look up specific ASIN\n');
-var_dump($items);
-var_dump($amazonAPI->GetErrors());
+// // Amazon echo, lookup with incorrect ASIN array
+// $asinIds = array('INVALID', 'INVALIDASIN', 'NOTANASIN');
+// $items = $amazonAPI->ItemLookUp($asinIds, true);
+// print('>> Look up specific ASIN\n');
+// var_dump($items);
+// var_dump($amazonAPI->GetErrors());
 ?>
diff --git a/tests/AmazonUrlBuilderTest.php b/tests/AmazonUrlBuilderTest.php
index 05500bc..dbfae51 100644
--- a/tests/AmazonUrlBuilderTest.php
+++ b/tests/AmazonUrlBuilderTest.php
@@ -54,7 +54,7 @@ public function testShouldBuildUrlWithExpectedDefaultTld() {
 
         $url = $amazonUrlBuilder->generate(array());
 
-        $this->assertContains($expectedTld, $url);
+        $this->assertStringContainsString($expectedTld, $url);
     }
 
     public function testShouldBuildUrlWithExpectedGivenUKLocale() {
@@ -63,7 +63,7 @@ public function testShouldBuildUrlWithExpectedGivenUKLocale() {
 
         $url = $amazonUrlBuilder->generate(array());
 
-        $this->assertContains($expectedTld, $url);
+        $this->assertStringContainsString($expectedTld, $url);
     }
 
     public function testShouldBuildUrlWithExpectedGivenJapaneseLocale() {
@@ -72,7 +72,7 @@ public function testShouldBuildUrlWithExpectedGivenJapaneseLocale() {
 
         $url = $amazonUrlBuilder->generate(array());
 
-        $this->assertContains($expectedTld, $url);
+        $this->assertStringContainsString($expectedTld, $url);
     }
 
     public function testShouldBuildUrlWithExpectedGivenMexicanLocale() {
@@ -81,7 +81,7 @@ public function testShouldBuildUrlWithExpectedGivenMexicanLocale() {
 
         $url = $amazonUrlBuilder->generate(array());
 
-        $this->assertContains($expectedTld, $url);
+        $this->assertStringContainsString($expectedTld, $url);
     }
 
     public function testShouldBuildUrlWithExpectedGivenValidLocale() {
@@ -90,7 +90,7 @@ public function testShouldBuildUrlWithExpectedGivenValidLocale() {
 
         $url = $amazonUrlBuilder->generate(array());
 
-        $this->assertContains($expectedTld, $url);
+        $this->assertStringContainsString($expectedTld, $url);
     }
 
     public function testShouldBuildUrlWithDefaultUSLocaleIfGivenLocaleIsUnknown() {
@@ -99,14 +99,14 @@ public function testShouldBuildUrlWithDefaultUSLocaleIfGivenLocaleIsUnknown() {
 
         $url = $amazonUrlBuilder->generate(array());
 
-        $this->assertContains($expectedTld, $url);
+        $this->assertStringContainsString($expectedTld, $url);
     }
 
     public function testShouldContainExpectedService() {
         $amazonUrlBuilder = $this->createDefaultUrlBuilder();
         $url = $amazonUrlBuilder->generate(array());
 
-        $this->assertContains('Service=AWSECommerceService', $url);
+        $this->assertStringContainsString('Service=AWSECommerceService', $url);
     }
 
     public function testShouldContainExpectedAssociateTag() {
@@ -118,7 +118,7 @@ public function testShouldContainExpectedAssociateTag() {
         );
         $url = $amazonUrlBuilder->generate(array());
 
-        $this->assertContains('AssociateTag=' . $givenAssociateTag, $url);
+        $this->assertStringContainsString('AssociateTag=' . $givenAssociateTag, $url);
     }
 
     public function testShouldContainExpectedAwsAccessKeyId() {
@@ -130,14 +130,14 @@ public function testShouldContainExpectedAwsAccessKeyId() {
         );
         $url = $amazonUrlBuilder->generate(array());
 
-        $this->assertContains('AWSAccessKeyId=' . $givenAwsAccessKeyId, $url);
+        $this->assertStringContainsString('AWSAccessKeyId=' . $givenAwsAccessKeyId, $url);
     }
 
     public function testShouldContainExpectedVersion() {
         $amazonUrlBuilder = $this->createDefaultUrlBuilder();
         $url = $amazonUrlBuilder->generate(array());
 
-        $this->assertContains('Version=2011-08-01', $url);
+        $this->assertStringContainsString('Version=2011-08-01', $url);
     }
 
     public function testShouldContainValidTimestamp() {
@@ -158,7 +158,7 @@ public function testShouldContainPassedParameter() {
 
         $parameters = $this->getUrlQueryParameterArray($url);
 
-        $this->assertContains('Operation=' . $givenParameters['Operation'], $url);
+        $this->assertStringContainsString('Operation=' . $givenParameters['Operation'], $url);
     }
 
     public function testShouldContainPassedParameterWithCorrectEncoding() {
@@ -172,7 +172,7 @@ public function testShouldContainPassedParameterWithCorrectEncoding() {
 
         $parameters = $this->getUrlQueryParameterArray($url);
 
-        $this->assertContains($expectedParameter, $url);
+        $this->assertStringContainsString($expectedParameter, $url);
     }
 }
 ?>