diff --git a/.gitignore b/.gitignore
index e227275..d7cab93 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,3 +1,2 @@
 build
-composer.lock
-vendor/
\ No newline at end of file
+vendor/
diff --git a/.travis.yml b/.travis.yml
index a182f24..e1d0e28 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,11 +1,8 @@
 language: php
 
 php:
-  - 5.3
-  - 5.4
-  - 5.5
-  - 5.6
-  - 7.0
+  - 7.1
+  - 7.2
 
 before_script:
   - composer self-update
diff --git a/composer.json b/composer.json
index 52b0cd2..919d549 100644
--- a/composer.json
+++ b/composer.json
@@ -27,13 +27,12 @@
         "bin/version-check"
     ],
     "require": {
-        "php": ">=5.3.7",
-        "ircmaxell/password-compat": "1.*",
-        "wp-cli/php-cli-tools": "0.10.*"
+        "php": ">=7.0.0",
+        "wp-cli/php-cli-tools": "0.11.*"
     },
     "require-dev": {
         "league/phpunit-coverage-listener": "~1.1",
-        "phpunit/phpunit": "4.*"
+        "phpunit/phpunit": "7.*"
     },
     "autoload": {
         "psr-0": {
diff --git a/composer.lock b/composer.lock
new file mode 100644
index 0000000..b53a937
--- /dev/null
+++ b/composer.lock
@@ -0,0 +1,1572 @@
+{
+    "_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",
+        "This file is @generated automatically"
+    ],
+    "content-hash": "1c2026281e2d6ebbedda8402ee934c5f",
+    "packages": [
+        {
+            "name": "wp-cli/php-cli-tools",
+            "version": "v0.11.8",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/wp-cli/php-cli-tools.git",
+                "reference": "363c75349f5dde561e0b416dd00f7aaa76fa2c27"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/wp-cli/php-cli-tools/zipball/363c75349f5dde561e0b416dd00f7aaa76fa2c27",
+                "reference": "363c75349f5dde561e0b416dd00f7aaa76fa2c27",
+                "shasum": ""
+            },
+            "require": {
+                "php": ">= 5.3.0"
+            },
+            "type": "library",
+            "autoload": {
+                "psr-0": {
+                    "cli": "lib/"
+                },
+                "files": [
+                    "lib/cli/cli.php"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "authors": [
+                {
+                    "name": "James Logsdon",
+                    "email": "jlogsdon@php.net",
+                    "role": "Developer"
+                },
+                {
+                    "name": "Daniel Bachhuber",
+                    "email": "daniel@handbuilt.co",
+                    "role": "Maintainer"
+                }
+            ],
+            "description": "Console utilities for PHP",
+            "homepage": "http://github.com/wp-cli/php-cli-tools",
+            "keywords": [
+                "cli",
+                "console"
+            ],
+            "time": "2017-10-12T21:50:48+00:00"
+        }
+    ],
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+                "url": "https://github.com/doctrine/instantiator.git",
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+            },
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+                "shasum": ""
+            },
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+                "php": "^7.1"
+            },
+            "require-dev": {
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+                "ext-pdo": "*",
+                "ext-phar": "*",
+                "phpunit/phpunit": "^6.2.3",
+                "squizlabs/php_codesniffer": "^3.0.2"
+            },
+            "type": "library",
+            "extra": {
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+                    "dev-master": "1.2.x-dev"
+                }
+            },
+            "autoload": {
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+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
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+            ],
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+                    "email": "ocramius@gmail.com",
+                    "homepage": "http://ocramius.github.com/"
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+            "description": "A small, lightweight utility to instantiate objects in PHP without invoking their constructors",
+            "homepage": "https://github.com/doctrine/instantiator",
+            "keywords": [
+                "constructor",
+                "instantiate"
+            ],
+            "time": "2017-07-22T11:58:36+00:00"
+        },
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+                "shasum": ""
+            },
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+                "php": ">=5.3.3"
+            },
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+            },
+            "type": "library",
+            "autoload": {
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+                }
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
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+            ],
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+                    "email": "toopay@taufanaditya.com",
+                    "homepage": "http://taufanaditya.com",
+                    "role": "lead"
+                }
+            ],
+            "description": "Utility library that allow you to process the PHPUnit code-coverage information and send it into some remote location via cURL",
+            "homepage": "https://github.com/php-loep/phpunit-coverage-listener",
+            "keywords": [
+                "coverage",
+                "coveralls",
+                "phpunit"
+            ],
+            "time": "2013-10-07T14:31:28+00:00"
+        },
+        {
+            "name": "myclabs/deep-copy",
+            "version": "1.7.0",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/myclabs/DeepCopy.git",
+                "reference": "3b8a3a99ba1f6a3952ac2747d989303cbd6b7a3e"
+            },
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+                "reference": "3b8a3a99ba1f6a3952ac2747d989303cbd6b7a3e",
+                "shasum": ""
+            },
+            "require": {
+                "php": "^5.6 || ^7.0"
+            },
+            "require-dev": {
+                "doctrine/collections": "^1.0",
+                "doctrine/common": "^2.6",
+                "phpunit/phpunit": "^4.1"
+            },
+            "type": "library",
+            "autoload": {
+                "psr-4": {
+                    "DeepCopy\\": "src/DeepCopy/"
+                },
+                "files": [
+                    "src/DeepCopy/deep_copy.php"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "description": "Create deep copies (clones) of your objects",
+            "keywords": [
+                "clone",
+                "copy",
+                "duplicate",
+                "object",
+                "object graph"
+            ],
+            "time": "2017-10-19T19:58:43+00:00"
+        },
+        {
+            "name": "phar-io/manifest",
+            "version": "1.0.1",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/phar-io/manifest.git",
+                "reference": "2df402786ab5368a0169091f61a7c1e0eb6852d0"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/phar-io/manifest/zipball/2df402786ab5368a0169091f61a7c1e0eb6852d0",
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+                "shasum": ""
+            },
+            "require": {
+                "ext-dom": "*",
+                "ext-phar": "*",
+                "phar-io/version": "^1.0.1",
+                "php": "^5.6 || ^7.0"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "1.0.x-dev"
+                }
+            },
+            "autoload": {
+                "classmap": [
+                    "src/"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "BSD-3-Clause"
+            ],
+            "authors": [
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+                    "email": "arne@blankerts.de",
+                    "role": "Developer"
+                },
+                {
+                    "name": "Sebastian Heuer",
+                    "email": "sebastian@phpeople.de",
+                    "role": "Developer"
+                },
+                {
+                    "name": "Sebastian Bergmann",
+                    "email": "sebastian@phpunit.de",
+                    "role": "Developer"
+                }
+            ],
+            "description": "Component for reading phar.io manifest information from a PHP Archive (PHAR)",
+            "time": "2017-03-05T18:14:27+00:00"
+        },
+        {
+            "name": "phar-io/version",
+            "version": "1.0.1",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/phar-io/version.git",
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+            },
+            "require": {
+                "php": "^5.6 || ^7.0"
+            },
+            "type": "library",
+            "autoload": {
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+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "BSD-3-Clause"
+            ],
+            "authors": [
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+                    "email": "arne@blankerts.de",
+                    "role": "Developer"
+                },
+                {
+                    "name": "Sebastian Heuer",
+                    "email": "sebastian@phpeople.de",
+                    "role": "Developer"
+                },
+                {
+                    "name": "Sebastian Bergmann",
+                    "email": "sebastian@phpunit.de",
+                    "role": "Developer"
+                }
+            ],
+            "description": "Library for handling version information and constraints",
+            "time": "2017-03-05T17:38:23+00:00"
+        },
+        {
+            "name": "phpdocumentor/reflection-common",
+            "version": "1.0.1",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/phpDocumentor/ReflectionCommon.git",
+                "reference": "21bdeb5f65d7ebf9f43b1b25d404f87deab5bfb6"
+            },
+            "dist": {
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+            },
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+            },
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+            "extra": {
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+            "autoload": {
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+                    "phpDocumentor\\Reflection\\": [
+                        "src"
+                    ]
+                }
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "authors": [
+                {
+                    "name": "Jaap van Otterdijk",
+                    "email": "opensource@ijaap.nl"
+                }
+            ],
+            "description": "Common reflection classes used by phpdocumentor to reflect the code structure",
+            "homepage": "http://www.phpdoc.org",
+            "keywords": [
+                "FQSEN",
+                "phpDocumentor",
+                "phpdoc",
+                "reflection",
+                "static analysis"
+            ],
+            "time": "2017-09-11T18:02:19+00:00"
+        },
+        {
+            "name": "phpdocumentor/reflection-docblock",
+            "version": "4.3.0",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/phpDocumentor/ReflectionDocBlock.git",
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+            "require": {
+                "php": "^7.0",
+                "phpdocumentor/reflection-common": "^1.0.0",
+                "phpdocumentor/type-resolver": "^0.4.0",
+                "webmozart/assert": "^1.0"
+            },
+            "require-dev": {
+                "doctrine/instantiator": "~1.0.5",
+                "mockery/mockery": "^1.0",
+                "phpunit/phpunit": "^6.4"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "4.x-dev"
+                }
+            },
+            "autoload": {
+                "psr-4": {
+                    "phpDocumentor\\Reflection\\": [
+                        "src/"
+                    ]
+                }
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "authors": [
+                {
+                    "name": "Mike van Riel",
+                    "email": "me@mikevanriel.com"
+                }
+            ],
+            "description": "With this component, a library can provide support for annotations via DocBlocks or otherwise retrieve information that is embedded in a DocBlock.",
+            "time": "2017-11-30T07:14:17+00:00"
+        },
+        {
+            "name": "phpdocumentor/type-resolver",
+            "version": "0.4.0",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/phpDocumentor/TypeResolver.git",
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+            },
+            "require": {
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+            "require-dev": {
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+            },
+            "type": "library",
+            "extra": {
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+                    "dev-master": "1.0.x-dev"
+                }
+            },
+            "autoload": {
+                "psr-4": {
+                    "phpDocumentor\\Reflection\\": [
+                        "src/"
+                    ]
+                }
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "authors": [
+                {
+                    "name": "Mike van Riel",
+                    "email": "me@mikevanriel.com"
+                }
+            ],
+            "time": "2017-07-14T14:27:02+00:00"
+        },
+        {
+            "name": "phpspec/prophecy",
+            "version": "1.7.5",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/phpspec/prophecy.git",
+                "reference": "dfd6be44111a7c41c2e884a336cc4f461b3b2401"
+            },
+            "dist": {
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+            },
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+                "phpdocumentor/reflection-docblock": "^2.0|^3.0.2|^4.0",
+                "sebastian/comparator": "^1.1|^2.0",
+                "sebastian/recursion-context": "^1.0|^2.0|^3.0"
+            },
+            "require-dev": {
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+                "phpunit/phpunit": "^4.8.35 || ^5.7 || ^6.5"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
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+                }
+            },
+            "autoload": {
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+                }
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "authors": [
+                {
+                    "name": "Konstantin Kudryashov",
+                    "email": "ever.zet@gmail.com",
+                    "homepage": "http://everzet.com"
+                },
+                {
+                    "name": "Marcello Duarte",
+                    "email": "marcello.duarte@gmail.com"
+                }
+            ],
+            "description": "Highly opinionated mocking framework for PHP 5.3+",
+            "homepage": "https://github.com/phpspec/prophecy",
+            "keywords": [
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+            "license": [
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+            ],
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+                    "name": "Sebastian Bergmann",
+                    "email": "sebastian@phpunit.de",
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+                }
+            ],
+            "description": "Library that provides collection, processing, and rendering functionality for PHP code coverage information.",
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+                "reference": "7cfd9e65d11ffb5af41198476395774d4c8a84c5",
+                "shasum": ""
+            },
+            "require": {
+                "php": "^7.0",
+                "sebastian/object-reflector": "^1.1.1",
+                "sebastian/recursion-context": "^3.0"
+            },
+            "require-dev": {
+                "phpunit/phpunit": "^6.0"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "3.0.x-dev"
+                }
+            },
+            "autoload": {
+                "classmap": [
+                    "src/"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "BSD-3-Clause"
+            ],
+            "authors": [
+                {
+                    "name": "Sebastian Bergmann",
+                    "email": "sebastian@phpunit.de"
+                }
+            ],
+            "description": "Traverses array structures and object graphs to enumerate all referenced objects",
+            "homepage": "https://github.com/sebastianbergmann/object-enumerator/",
+            "time": "2017-08-03T12:35:26+00:00"
+        },
+        {
+            "name": "sebastian/object-reflector",
+            "version": "1.1.1",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/sebastianbergmann/object-reflector.git",
+                "reference": "773f97c67f28de00d397be301821b06708fca0be"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/sebastianbergmann/object-reflector/zipball/773f97c67f28de00d397be301821b06708fca0be",
+                "reference": "773f97c67f28de00d397be301821b06708fca0be",
+                "shasum": ""
+            },
+            "require": {
+                "php": "^7.0"
+            },
+            "require-dev": {
+                "phpunit/phpunit": "^6.0"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "1.1-dev"
+                }
+            },
+            "autoload": {
+                "classmap": [
+                    "src/"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "BSD-3-Clause"
+            ],
+            "authors": [
+                {
+                    "name": "Sebastian Bergmann",
+                    "email": "sebastian@phpunit.de"
+                }
+            ],
+            "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"
+        },
+        {
+            "name": "sebastian/recursion-context",
+            "version": "3.0.0",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/sebastianbergmann/recursion-context.git",
+                "reference": "5b0cd723502bac3b006cbf3dbf7a1e3fcefe4fa8"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/sebastianbergmann/recursion-context/zipball/5b0cd723502bac3b006cbf3dbf7a1e3fcefe4fa8",
+                "reference": "5b0cd723502bac3b006cbf3dbf7a1e3fcefe4fa8",
+                "shasum": ""
+            },
+            "require": {
+                "php": "^7.0"
+            },
+            "require-dev": {
+                "phpunit/phpunit": "^6.0"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "3.0.x-dev"
+                }
+            },
+            "autoload": {
+                "classmap": [
+                    "src/"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "BSD-3-Clause"
+            ],
+            "authors": [
+                {
+                    "name": "Jeff Welch",
+                    "email": "whatthejeff@gmail.com"
+                },
+                {
+                    "name": "Sebastian Bergmann",
+                    "email": "sebastian@phpunit.de"
+                },
+                {
+                    "name": "Adam Harvey",
+                    "email": "aharvey@php.net"
+                }
+            ],
+            "description": "Provides functionality to recursively process PHP variables",
+            "homepage": "http://www.github.com/sebastianbergmann/recursion-context",
+            "time": "2017-03-03T06:23:57+00:00"
+        },
+        {
+            "name": "sebastian/resource-operations",
+            "version": "1.0.0",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/sebastianbergmann/resource-operations.git",
+                "reference": "ce990bb21759f94aeafd30209e8cfcdfa8bc3f52"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/sebastianbergmann/resource-operations/zipball/ce990bb21759f94aeafd30209e8cfcdfa8bc3f52",
+                "reference": "ce990bb21759f94aeafd30209e8cfcdfa8bc3f52",
+                "shasum": ""
+            },
+            "require": {
+                "php": ">=5.6.0"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "1.0.x-dev"
+                }
+            },
+            "autoload": {
+                "classmap": [
+                    "src/"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "BSD-3-Clause"
+            ],
+            "authors": [
+                {
+                    "name": "Sebastian Bergmann",
+                    "email": "sebastian@phpunit.de"
+                }
+            ],
+            "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"
+        },
+        {
+            "name": "sebastian/version",
+            "version": "2.0.1",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/sebastianbergmann/version.git",
+                "reference": "99732be0ddb3361e16ad77b68ba41efc8e979019"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/sebastianbergmann/version/zipball/99732be0ddb3361e16ad77b68ba41efc8e979019",
+                "reference": "99732be0ddb3361e16ad77b68ba41efc8e979019",
+                "shasum": ""
+            },
+            "require": {
+                "php": ">=5.6"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "2.0.x-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": "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"
+        },
+        {
+            "name": "theseer/tokenizer",
+            "version": "1.1.0",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/theseer/tokenizer.git",
+                "reference": "cb2f008f3f05af2893a87208fe6a6c4985483f8b"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/theseer/tokenizer/zipball/cb2f008f3f05af2893a87208fe6a6c4985483f8b",
+                "reference": "cb2f008f3f05af2893a87208fe6a6c4985483f8b",
+                "shasum": ""
+            },
+            "require": {
+                "ext-dom": "*",
+                "ext-tokenizer": "*",
+                "ext-xmlwriter": "*",
+                "php": "^7.0"
+            },
+            "type": "library",
+            "autoload": {
+                "classmap": [
+                    "src/"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "BSD-3-Clause"
+            ],
+            "authors": [
+                {
+                    "name": "Arne Blankerts",
+                    "email": "arne@blankerts.de",
+                    "role": "Developer"
+                }
+            ],
+            "description": "A small library for converting tokenized PHP source code into XML and potentially other formats",
+            "time": "2017-04-07T12:08:54+00:00"
+        },
+        {
+            "name": "webmozart/assert",
+            "version": "1.3.0",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/webmozart/assert.git",
+                "reference": "0df1908962e7a3071564e857d86874dad1ef204a"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/webmozart/assert/zipball/0df1908962e7a3071564e857d86874dad1ef204a",
+                "reference": "0df1908962e7a3071564e857d86874dad1ef204a",
+                "shasum": ""
+            },
+            "require": {
+                "php": "^5.3.3 || ^7.0"
+            },
+            "require-dev": {
+                "phpunit/phpunit": "^4.6",
+                "sebastian/version": "^1.0.1"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "1.3-dev"
+                }
+            },
+            "autoload": {
+                "psr-4": {
+                    "Webmozart\\Assert\\": "src/"
+                }
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "authors": [
+                {
+                    "name": "Bernhard Schussek",
+                    "email": "bschussek@gmail.com"
+                }
+            ],
+            "description": "Assertions to validate method input/output with nice error messages.",
+            "keywords": [
+                "assert",
+                "check",
+                "validate"
+            ],
+            "time": "2018-01-29T19:49:41+00:00"
+        }
+    ],
+    "aliases": [],
+    "minimum-stability": "stable",
+    "stability-flags": [],
+    "prefer-stable": false,
+    "prefer-lowest": false,
+    "platform": {
+        "php": ">=7.0.0"
+    },
+    "platform-dev": []
+}
diff --git a/src/JeremyKendall/Password/Decorator/AbstractDecorator.php b/src/JeremyKendall/Password/Decorator/AbstractDecorator.php
index 6ff0958..11b7a96 100644
--- a/src/JeremyKendall/Password/Decorator/AbstractDecorator.php
+++ b/src/JeremyKendall/Password/Decorator/AbstractDecorator.php
@@ -63,4 +63,21 @@ public function setOptions(array $options)
     {
         $this->validator->setOptions($options);
     }
+
+    /**
+     * {@inheritDoc}
+     */
+    public function setAlgorithm($algorithm)
+    {
+        $this->validator->setAlgorithm($algorithm);
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    public function getAlgorithm()
+    {
+        return $this->validator->getAlgorithm() ?: PASSWORD_DEFAULT;
+    }
+
 }
diff --git a/src/JeremyKendall/Password/Decorator/UpgradeDecorator.php b/src/JeremyKendall/Password/Decorator/UpgradeDecorator.php
index c0f938e..d3c4801 100644
--- a/src/JeremyKendall/Password/Decorator/UpgradeDecorator.php
+++ b/src/JeremyKendall/Password/Decorator/UpgradeDecorator.php
@@ -55,7 +55,7 @@ public function isValid($password, $passwordHash, $legacySalt = null, $identity
 
         return $this->validator->isValid($password, $passwordHash, $legacySalt, $identity);
     }
-    
+
     /**
      * This method returns an upgraded password, one that is hashed by the
      * password_hash method in such a way that it forces the PasswordValidator
@@ -77,6 +77,6 @@ private function createHashWhichWillForceRehashInValidator($password)
             $cost++;
         }
 
-        return password_hash($password, PASSWORD_DEFAULT, array('cost' => $cost));
+        return password_hash($password, $this->getAlgorithm(), array('cost' => $cost));
     }
 }
diff --git a/src/JeremyKendall/Password/PasswordValidator.php b/src/JeremyKendall/Password/PasswordValidator.php
index 54f6311..2b1bb6a 100644
--- a/src/JeremyKendall/Password/PasswordValidator.php
+++ b/src/JeremyKendall/Password/PasswordValidator.php
@@ -10,7 +10,6 @@
 
 namespace JeremyKendall\Password;
 
-use JeremyKendall\Password\PasswordHashFailureException;
 use JeremyKendall\Password\Result as ValidationResult;
 
 /**
@@ -28,6 +27,11 @@ class PasswordValidator implements PasswordValidatorInterface
      */
     protected $resultInfo = array();
 
+    /**
+     * @var int algorithm for password_hash
+     */
+    protected $algorithm = PASSWORD_DEFAULT;
+
     /**
      * {@inheritDoc}
      */
@@ -41,8 +45,8 @@ public function isValid($password, $passwordHash, $legacySalt = null, $identity
         $isValid = password_verify($password, $passwordHash);
 
         $needsRehash = password_needs_rehash(
-            $passwordHash, 
-            PASSWORD_DEFAULT, 
+            $passwordHash,
+            $this->algorithm,
             $this->getOptions()
         );
 
@@ -67,7 +71,7 @@ public function rehash($password)
     {
         $hash = password_hash(
             $password,
-            PASSWORD_DEFAULT,
+            $this->algorithm,
             $this->getOptions()
         );
 
@@ -101,4 +105,21 @@ public function setOptions(array $options)
     {
         $this->options = $options;
     }
+
+    /**
+     * {@inheritDoc}
+     */
+    public function setAlgorithm($algorithm)
+    {
+        $this->algorithm = $algorithm;
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    public function getAlgorithm()
+    {
+        return $this->algorithm;
+    }
+
 }
diff --git a/src/JeremyKendall/Password/PasswordValidatorInterface.php b/src/JeremyKendall/Password/PasswordValidatorInterface.php
index 1bc1f13..9ec015d 100644
--- a/src/JeremyKendall/Password/PasswordValidatorInterface.php
+++ b/src/JeremyKendall/Password/PasswordValidatorInterface.php
@@ -52,4 +52,21 @@ public function setOptions(array $options);
      * @return array password_hash options
      */
     public function getOptions();
+
+    /**
+     * Set the algorithm for the password_hash function
+     *
+     * @see http://php.net/password_hash
+     * Defaults to PASSWORD_DEFAULT
+     *
+     * @param int $algorithm
+     */
+    public function setAlgorithm($algorithm);
+
+    /**
+     * Get the algorithm for the password_hash function
+     *
+     * @return int algorithm
+     */
+    public function getAlgorithm();
 }
diff --git a/tests/JeremyKendall/Password/Tests/Decorator/AbstractDecoratorTest.php b/tests/JeremyKendall/Password/Tests/Decorator/AbstractDecoratorTest.php
index c0d8ea5..d767a07 100644
--- a/tests/JeremyKendall/Password/Tests/Decorator/AbstractDecoratorTest.php
+++ b/tests/JeremyKendall/Password/Tests/Decorator/AbstractDecoratorTest.php
@@ -11,23 +11,28 @@
 namespace JeremyKendall\Password\Tests\Decorator;
 
 use JeremyKendall\Password\Decorator\AbstractDecorator;
+use JeremyKendall\Password\PasswordValidatorInterface;
+use PHPUnit\Framework\TestCase;
 
-class AbstractDecoratorTest extends \PHPUnit_Framework_TestCase
+class AbstractDecoratorTest extends TestCase
 {
+
+    /**
+     * @var AbstractDecorator
+     */
     private $decorator;
 
+    /**
+     * @var PasswordValidatorInterface|\PHPUnit_Framework_MockObject_MockObject
+     */
     private $decoratedValidator;
 
     protected function setUp()
     {
-        parent::setUp();
-
-        $this->decoratedValidator = $this->getMockBuilder('JeremyKendall\Password\PasswordValidatorInterface')
-            ->disableOriginalConstructor()
-            ->getMock();
+        $this->decoratedValidator = $this->createMock(PasswordValidatorInterface::class);
 
-        $this->decorator = 
-            $this->getMockBuilder('JeremyKendall\Password\Decorator\AbstractDecorator')
+        $this->decorator =
+            $this->getMockBuilder(AbstractDecorator::class)
             ->setConstructorArgs(array($this->decoratedValidator))
             ->getMockForAbstractClass();
     }
@@ -49,7 +54,7 @@ public function testIsValidWithOptionalArgs()
 
         $this->decorator->isValid('password', 'passwordHash', 'legacySalt', 'identity');
     }
-    
+
     public function testRehash()
     {
         $this->decoratedValidator->expects($this->once())
diff --git a/tests/JeremyKendall/Password/Tests/Decorator/IntegrationTest.php b/tests/JeremyKendall/Password/Tests/Decorator/IntegrationTest.php
index 7e4a270..86ded8b 100644
--- a/tests/JeremyKendall/Password/Tests/Decorator/IntegrationTest.php
+++ b/tests/JeremyKendall/Password/Tests/Decorator/IntegrationTest.php
@@ -15,18 +15,23 @@
 use JeremyKendall\Password\Decorator\StorageDecorator;
 use JeremyKendall\Password\Result as ValidationResult;
 use JeremyKendall\Password\Storage\StorageInterface;
+use PHPUnit\Framework\TestCase;
 
 /**
  * @group integration
  */
-class IntegrationTest extends \PHPUnit_Framework_TestCase
+class IntegrationTest extends TestCase
 {
+
+    /**
+     * @var StorageInterface|\PHPUnit_Framework_MockObject_MockObject
+     */
     protected $storage;
 
+    protected $callback;
+
     protected function setUp()
     {
-        parent::setUp();
-
         $this->callback = function ($credential, $passwordHash) {
             if (hash('sha512', $credential) === $passwordHash) {
                 return true;
@@ -34,16 +39,16 @@ protected function setUp()
 
             return false;
         };
-        $this->storage = $this->getMock('JeremyKendall\Password\Storage\StorageInterface');
+        $this->storage = $this->createMock(StorageInterface::class);
     }
 
     public function testLegacyPasswordIsValidUpgradedRehashedStored()
     {
         $validator = new UpgradeDecorator(
             new StorageDecorator(
-                new PasswordValidator(), 
+                new PasswordValidator(),
                 $this->storage
-            ), 
+            ),
             $this->callback
         );
         $password = 'password';
@@ -69,9 +74,9 @@ public function testLegacyPasswordIsValidUpgradedRehashedStored2()
     {
         $validator = new StorageDecorator(
             new UpgradeDecorator(
-                new PasswordValidator(), 
+                new PasswordValidator(),
                 $this->callback
-            ), 
+            ),
             $this->storage
         );
         $password = 'password';
diff --git a/tests/JeremyKendall/Password/Tests/Decorator/KarptoniteRehashUpgradeDecoratorTest.php b/tests/JeremyKendall/Password/Tests/Decorator/KarptoniteRehashUpgradeDecoratorTest.php
index b66da34..76f3be5 100644
--- a/tests/JeremyKendall/Password/Tests/Decorator/KarptoniteRehashUpgradeDecoratorTest.php
+++ b/tests/JeremyKendall/Password/Tests/Decorator/KarptoniteRehashUpgradeDecoratorTest.php
@@ -11,7 +11,9 @@
 namespace JeremyKendall\Password\Tests\Decorator;
 
 use JeremyKendall\Password\Decorator\UpgradeDecorator;
+use JeremyKendall\Password\PasswordValidatorInterface;
 use JeremyKendall\Password\Result as ValidationResult;
+use PHPUnit\Framework\TestCase;
 
 /**
  * This test validates the upgrade scenario outlined in Daniel Karp's blog post
@@ -22,9 +24,17 @@
  * test the plain text password's legacy hash against the upgraded, persisted
  * hash.
  */
-class KarptoniteRehashUpgradeDecoratorTest extends \PHPUnit_Framework_TestCase
+class KarptoniteRehashUpgradeDecoratorTest extends TestCase
 {
+
+    /**
+     * @var UpgradeDecorator
+     */
     private $decorator;
+
+    /**
+     * @var PasswordValidatorInterface|\PHPUnit_Framework_MockObject_MockObject
+     */
     private $decoratedValidator;
     private $validationCallback;
     private $plainTextPassword;
@@ -33,8 +43,6 @@ class KarptoniteRehashUpgradeDecoratorTest extends \PHPUnit_Framework_TestCase
 
     protected function setUp()
     {
-        parent::setUp();
-
         $this->validationCallback = function ($credential, $passwordHash, $salt) {
             // Recreate the legacy hash. This was the persisted password hash
             // prior to upgrading.
@@ -48,8 +56,7 @@ protected function setUp()
             return false;
         };
 
-        $interface = 'JeremyKendall\Password\PasswordValidatorInterface';
-        $this->decoratedValidator = $this->getMockBuilder($interface)
+        $this->decoratedValidator = $this->getMockBuilder(PasswordValidatorInterface::class)
             ->disableOriginalConstructor()
             ->getMock();
 
@@ -128,6 +135,8 @@ public function testRehashingPasswordHashesScenarioCredentialIsNotValid()
 
     /**
      * @dataProvider callbackDataProvider
+     * @param string $password
+     * @param bool $result
      */
     public function testVerifyValidationCallback($password, $result)
     {
diff --git a/tests/JeremyKendall/Password/Tests/Decorator/StorageDecoratorTest.php b/tests/JeremyKendall/Password/Tests/Decorator/StorageDecoratorTest.php
index b1d90fe..18a76ed 100644
--- a/tests/JeremyKendall/Password/Tests/Decorator/StorageDecoratorTest.php
+++ b/tests/JeremyKendall/Password/Tests/Decorator/StorageDecoratorTest.php
@@ -11,25 +11,34 @@
 namespace JeremyKendall\Password\Tests\Decorator;
 
 use JeremyKendall\Password\Decorator\StorageDecorator;
+use JeremyKendall\Password\PasswordValidatorInterface;
 use JeremyKendall\Password\Result as ValidationResult;
+use JeremyKendall\Password\Storage\IdentityMissingException;
 use JeremyKendall\Password\Storage\StorageInterface;
+use PHPUnit\Framework\TestCase;
 
-class StorageDecoratorTest extends \PHPUnit_Framework_TestCase
+class StorageDecoratorTest extends TestCase
 {
+
+    /**
+     * @var StorageDecorator
+     */
     protected $decorator;
 
+    /**
+     * @var PasswordValidatorInterface|\PHPUnit_Framework_MockObject_MockObject
+     */
     protected $decoratedValidator;
 
+    /**
+     * @var StorageInterface|\PHPUnit_Framework_MockObject_MockObject
+     */
     protected $storage;
 
     protected function setUp()
     {
-        parent::setUp();
-
-        $this->storage = $this->getMock('JeremyKendall\Password\Storage\StorageInterface');
-        $this->decoratedValidator = $this->getMockBuilder('JeremyKendall\Password\PasswordValidatorInterface')
-            ->disableOriginalConstructor()
-            ->getMock();
+        $this->storage = $this->createMock(StorageInterface::class);
+        $this->decoratedValidator = $this->createMock(PasswordValidatorInterface::class);
         $this->decorator = new StorageDecorator(
             $this->decoratedValidator,
             $this->storage
@@ -63,10 +72,8 @@ public function testPasswordValidPasswordRehashedAndStored()
 
     public function testFailureToProvideIdentityThrowsException()
     {
-        $this->setExpectedException(
-            'JeremyKendall\Password\Storage\IdentityMissingException',
-            'The StorageDecorator requires an $identity argument.'
-        );
+        $this->expectException(IdentityMissingException::class);
+        $this->expectExceptionMessage('The StorageDecorator requires an $identity argument.');
 
         $valid = new ValidationResult(
             ValidationResult::SUCCESS_PASSWORD_REHASHED,
@@ -81,6 +88,6 @@ public function testFailureToProvideIdentityThrowsException()
             ->with('password', 'passwordHash')
             ->will($this->returnValue($valid));
 
-        $result = $this->decorator->isValid('password', 'passwordHash');
+        $this->decorator->isValid('password', 'passwordHash');
     }
 }
diff --git a/tests/JeremyKendall/Password/Tests/Decorator/UpgradeDecoratorTest.php b/tests/JeremyKendall/Password/Tests/Decorator/UpgradeDecoratorTest.php
index 606eb92..a1a9d58 100644
--- a/tests/JeremyKendall/Password/Tests/Decorator/UpgradeDecoratorTest.php
+++ b/tests/JeremyKendall/Password/Tests/Decorator/UpgradeDecoratorTest.php
@@ -11,19 +11,27 @@
 namespace JeremyKendall\Password\Tests\Decorator;
 
 use JeremyKendall\Password\Decorator\UpgradeDecorator;
+use JeremyKendall\Password\PasswordValidatorInterface;
 use JeremyKendall\Password\Result as ValidationResult;
+use PHPUnit\Framework\TestCase;
 
-class UpgradeDecoratorTest extends \PHPUnit_Framework_TestCase
+class UpgradeDecoratorTest extends TestCase
 {
+
+    /**
+     * @var UpgradeDecorator
+     */
     private $decorator;
 
+    /**
+     * @var PasswordValidatorInterface|\PHPUnit_Framework_MockObject_MockObject
+     */
     private $decoratedValidator;
 
     private $validationCallback;
 
     protected function setUp()
     {
-        parent::setUp();
         $this->validationCallback = function ($credential, $passwordHash) {
             if (hash('sha512', $credential) === $passwordHash) {
                 return true;
@@ -31,10 +39,8 @@ protected function setUp()
 
             return false;
         };
- 
-        $this->decoratedValidator = $this->getMockBuilder('JeremyKendall\Password\PasswordValidatorInterface')
-            ->disableOriginalConstructor()
-            ->getMock();
+
+        $this->decoratedValidator = $this->createMock(PasswordValidatorInterface::class);
 
         $this->decorator = new UpgradeDecorator(
             $this->decoratedValidator,
@@ -63,7 +69,7 @@ public function testPasswordValidAndPasswordRehashed()
 
         $this->assertTrue($result->isValid());
         $this->assertEquals(
-            ValidationResult::SUCCESS_PASSWORD_REHASHED, 
+            ValidationResult::SUCCESS_PASSWORD_REHASHED,
             $result->getCode()
         );
         // Rehashed password is a valid hash
@@ -115,7 +121,7 @@ public function testPasswordHashPasswordValidDecoratedValidatorTakesOver()
 
         $this->assertTrue($result->isValid());
         $this->assertEquals(
-            ValidationResult::SUCCESS, 
+            ValidationResult::SUCCESS,
             $result->getCode()
         );
         $this->assertNull($result->getPassword());
diff --git a/tests/JeremyKendall/Password/Tests/PasswordValidatorTest.php b/tests/JeremyKendall/Password/Tests/PasswordValidatorTest.php
index 1ec76dd..2ca7f54 100644
--- a/tests/JeremyKendall/Password/Tests/PasswordValidatorTest.php
+++ b/tests/JeremyKendall/Password/Tests/PasswordValidatorTest.php
@@ -12,14 +12,17 @@
 
 use JeremyKendall\Password\PasswordValidator;
 use JeremyKendall\Password\Result as ValidationResult;
+use PHPUnit\Framework\TestCase;
 
-class PasswordValidatorTest extends \PHPUnit_Framework_TestCase
+class PasswordValidatorTest extends TestCase
 {
+    /**
+     * @var PasswordValidator
+     */
     private $validator;
 
     protected function setUp()
     {
-        parent::setUp();
         $this->validator = new PasswordValidator();
     }
 
@@ -31,7 +34,25 @@ public function testPasswordIsValidDoesNotNeedRehash()
 
         $this->assertTrue($result->isValid());
         $this->assertEquals(
-            ValidationResult::SUCCESS, 
+            ValidationResult::SUCCESS,
+            $result->getCode()
+        );
+        $this->assertNull($result->getPassword());
+    }
+
+    public function testPasswordIsValidDoesNotNeedRehashWithAlgorithm()
+    {
+        if (!defined('PASSWORD_ARGON2I')) {
+            $this->markTestSkipped('PASSWORD_ARGON2I is only available for PHP >= 7.2');
+        }
+        $passwordHash = password_hash('password', PASSWORD_ARGON2I);
+
+        $this->validator->setAlgorithm(PASSWORD_ARGON2I);
+        $result = $this->validator->isValid('password', $passwordHash);
+
+        $this->assertTrue($result->isValid());
+        $this->assertEquals(
+            ValidationResult::SUCCESS,
             $result->getCode()
         );
         $this->assertNull($result->getPassword());
@@ -47,7 +68,7 @@ public function testPasswordIsValidAndIsRehashed()
 
         $this->assertTrue($result->isValid());
         $this->assertEquals(
-            ValidationResult::SUCCESS_PASSWORD_REHASHED, 
+            ValidationResult::SUCCESS_PASSWORD_REHASHED,
             $result->getCode()
         );
         $this->assertStringStartsWith('$2y$10$', $result->getPassword());
@@ -66,12 +87,34 @@ public function testCostNineHashValidAndNotRehashedBecauseOptions()
 
         $this->assertTrue($result->isValid());
         $this->assertEquals(
-            ValidationResult::SUCCESS, 
+            ValidationResult::SUCCESS,
             $result->getCode()
         );
         $this->assertNull($result->getPassword());
     }
 
+    public function testPasswordIsValidAndIsRehashedBecauseAlgorithm()
+    {
+        if (!defined('PASSWORD_ARGON2I')) {
+            $this->markTestSkipped('PASSWORD_ARGON2I is only available for PHP >= 7.2');
+        }
+        $options = ['cost' => 9];
+        $passwordHash = password_hash('password', PASSWORD_DEFAULT, $options);
+        $this->assertStringStartsWith('$2y$09$', $passwordHash);
+
+        $this->validator->setAlgorithm(PASSWORD_ARGON2I);
+        $result = $this->validator->isValid('password', $passwordHash);
+
+        $this->assertTrue($result->isValid());
+        $this->assertEquals(
+            ValidationResult::SUCCESS_PASSWORD_REHASHED,
+            $result->getCode()
+        );
+        $this->assertStringStartsWith('$argon2i$v=19$m=1024,t=2,p=', $result->getPassword());
+        // Rehashed password is a valid hash
+        $this->assertTrue(password_verify('password', $result->getPassword()));
+    }
+
     public function testPasswordIsInvalid()
     {
         $passwordHash = password_hash('passwordz', PASSWORD_DEFAULT);
@@ -80,7 +123,7 @@ public function testPasswordIsInvalid()
 
         $this->assertFalse($result->isValid());
         $this->assertEquals(
-            ValidationResult::FAILURE_PASSWORD_INVALID, 
+            ValidationResult::FAILURE_PASSWORD_INVALID,
             $result->getCode()
         );
         $this->assertNull($result->getPassword());