diff --git a/.github/workflows/ci.yaml b/.github/workflows/ci.yaml
index f085bc2..76e2b28 100644
--- a/.github/workflows/ci.yaml
+++ b/.github/workflows/ci.yaml
@@ -4,8 +4,23 @@ on: [push, pull_request]
 
 jobs:
   unit-tests:
-    - name: phpunit
-      uses: php-actions/phpunit@v3
+    runs-on: ubuntu-latest
+
+    strategy:
+      matrix:
+        php-version: [8.2, 8.3]
+
+    steps:
+    - uses: actions/checkout@v3
+    - name: Set up PHP
+      uses: shivammathur/setup-php@v2
       with:
-        configuration: "phpunit.xml.dist"
-        memory_limit: "256M"
+        php-version: ${{ matrix.php-version }}
+    - name: Validate composer.json and composer.lock
+      run: composer validate
+
+    - name: Install dependencies
+      run: composer install --prefer-dist --no-progress --no-suggest
+
+    - name: Run tests
+      run: ./vendor/bin/phpunit
diff --git a/.gitignore b/.gitignore
index f014d92..a8e833c 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,2 +1,4 @@
 .DS_Store
-/vendor/
\ No newline at end of file
+/vendor/
+.phpunit.cache
+.phpunit.result.cache
diff --git a/composer.json b/composer.json
index eb0646d..4844693 100644
--- a/composer.json
+++ b/composer.json
@@ -16,11 +16,11 @@
         }
     ],
     "require": {
-        "php": ">=5.6.0",
+        "php": ">=5.6",
       "ext-mbstring": "*"
     },
     "require-dev": {
-        "phpunit/phpunit": "5.*"
+        "phpunit/phpunit": "11.*"
     },
     "autoload": {
         "psr-4": {
diff --git a/composer.lock b/composer.lock
new file mode 100644
index 0000000..9438145
--- /dev/null
+++ b/composer.lock
@@ -0,0 +1,1653 @@
+{
+    "_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#installing-dependencies",
+        "This file is @generated automatically"
+    ],
+    "content-hash": "cf350f73687a2f10f6ab55a333cd6346",
+    "packages": [],
+    "packages-dev": [
+        {
+            "name": "myclabs/deep-copy",
+            "version": "1.11.1",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/myclabs/DeepCopy.git",
+                "reference": "7284c22080590fb39f2ffa3e9057f10a4ddd0e0c"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/myclabs/DeepCopy/zipball/7284c22080590fb39f2ffa3e9057f10a4ddd0e0c",
+                "reference": "7284c22080590fb39f2ffa3e9057f10a4ddd0e0c",
+                "shasum": ""
+            },
+            "require": {
+                "php": "^7.1 || ^8.0"
+            },
+            "conflict": {
+                "doctrine/collections": "<1.6.8",
+                "doctrine/common": "<2.13.3 || >=3,<3.2.2"
+            },
+            "require-dev": {
+                "doctrine/collections": "^1.6.8",
+                "doctrine/common": "^2.13.3 || ^3.2.2",
+                "phpunit/phpunit": "^7.5.20 || ^8.5.23 || ^9.5.13"
+            },
+            "type": "library",
+            "autoload": {
+                "files": [
+                    "src/DeepCopy/deep_copy.php"
+                ],
+                "psr-4": {
+                    "DeepCopy\\": "src/DeepCopy/"
+                }
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "description": "Create deep copies (clones) of your objects",
+            "keywords": [
+                "clone",
+                "copy",
+                "duplicate",
+                "object",
+                "object graph"
+            ],
+            "support": {
+                "issues": "https://github.com/myclabs/DeepCopy/issues",
+                "source": "https://github.com/myclabs/DeepCopy/tree/1.11.1"
+            },
+            "funding": [
+                {
+                    "url": "https://tidelift.com/funding/github/packagist/myclabs/deep-copy",
+                    "type": "tidelift"
+                }
+            ],
+            "time": "2023-03-08T13:26:56+00:00"
+        },
+        {
+            "name": "nikic/php-parser",
+            "version": "v5.0.2",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/nikic/PHP-Parser.git",
+                "reference": "139676794dc1e9231bf7bcd123cfc0c99182cb13"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/nikic/PHP-Parser/zipball/139676794dc1e9231bf7bcd123cfc0c99182cb13",
+                "reference": "139676794dc1e9231bf7bcd123cfc0c99182cb13",
+                "shasum": ""
+            },
+            "require": {
+                "ext-ctype": "*",
+                "ext-json": "*",
+                "ext-tokenizer": "*",
+                "php": ">=7.4"
+            },
+            "require-dev": {
+                "ircmaxell/php-yacc": "^0.0.7",
+                "phpunit/phpunit": "^7.0 || ^8.0 || ^9.0"
+            },
+            "bin": [
+                "bin/php-parse"
+            ],
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "5.0-dev"
+                }
+            },
+            "autoload": {
+                "psr-4": {
+                    "PhpParser\\": "lib/PhpParser"
+                }
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "BSD-3-Clause"
+            ],
+            "authors": [
+                {
+                    "name": "Nikita Popov"
+                }
+            ],
+            "description": "A PHP parser written in PHP",
+            "keywords": [
+                "parser",
+                "php"
+            ],
+            "support": {
+                "issues": "https://github.com/nikic/PHP-Parser/issues",
+                "source": "https://github.com/nikic/PHP-Parser/tree/v5.0.2"
+            },
+            "time": "2024-03-05T20:51:40+00:00"
+        },
+        {
+            "name": "phar-io/manifest",
+            "version": "2.0.4",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/phar-io/manifest.git",
+                "reference": "54750ef60c58e43759730615a392c31c80e23176"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/phar-io/manifest/zipball/54750ef60c58e43759730615a392c31c80e23176",
+                "reference": "54750ef60c58e43759730615a392c31c80e23176",
+                "shasum": ""
+            },
+            "require": {
+                "ext-dom": "*",
+                "ext-libxml": "*",
+                "ext-phar": "*",
+                "ext-xmlwriter": "*",
+                "phar-io/version": "^3.0.1",
+                "php": "^7.2 || ^8.0"
+            },
+            "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": "Arne Blankerts",
+                    "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)",
+            "support": {
+                "issues": "https://github.com/phar-io/manifest/issues",
+                "source": "https://github.com/phar-io/manifest/tree/2.0.4"
+            },
+            "funding": [
+                {
+                    "url": "https://github.com/theseer",
+                    "type": "github"
+                }
+            ],
+            "time": "2024-03-03T12:33:53+00:00"
+        },
+        {
+            "name": "phar-io/version",
+            "version": "3.2.1",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/phar-io/version.git",
+                "reference": "4f7fd7836c6f332bb2933569e566a0d6c4cbed74"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/phar-io/version/zipball/4f7fd7836c6f332bb2933569e566a0d6c4cbed74",
+                "reference": "4f7fd7836c6f332bb2933569e566a0d6c4cbed74",
+                "shasum": ""
+            },
+            "require": {
+                "php": "^7.2 || ^8.0"
+            },
+            "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"
+                },
+                {
+                    "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",
+            "support": {
+                "issues": "https://github.com/phar-io/version/issues",
+                "source": "https://github.com/phar-io/version/tree/3.2.1"
+            },
+            "time": "2022-02-21T01:04:05+00:00"
+        },
+        {
+            "name": "phpunit/php-code-coverage",
+            "version": "11.0.3",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/sebastianbergmann/php-code-coverage.git",
+                "reference": "7e35a2cbcabac0e6865fd373742ea432a3c34f92"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/sebastianbergmann/php-code-coverage/zipball/7e35a2cbcabac0e6865fd373742ea432a3c34f92",
+                "reference": "7e35a2cbcabac0e6865fd373742ea432a3c34f92",
+                "shasum": ""
+            },
+            "require": {
+                "ext-dom": "*",
+                "ext-libxml": "*",
+                "ext-xmlwriter": "*",
+                "nikic/php-parser": "^5.0",
+                "php": ">=8.2",
+                "phpunit/php-file-iterator": "^5.0",
+                "phpunit/php-text-template": "^4.0",
+                "sebastian/code-unit-reverse-lookup": "^4.0",
+                "sebastian/complexity": "^4.0",
+                "sebastian/environment": "^7.0",
+                "sebastian/lines-of-code": "^3.0",
+                "sebastian/version": "^5.0",
+                "theseer/tokenizer": "^1.2.0"
+            },
+            "require-dev": {
+                "phpunit/phpunit": "^11.0"
+            },
+            "suggest": {
+                "ext-pcov": "PHP extension that provides line coverage",
+                "ext-xdebug": "PHP extension that provides line coverage as well as branch and path coverage"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-main": "11.0-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": "Library that provides collection, processing, and rendering functionality for PHP code coverage information.",
+            "homepage": "https://github.com/sebastianbergmann/php-code-coverage",
+            "keywords": [
+                "coverage",
+                "testing",
+                "xunit"
+            ],
+            "support": {
+                "issues": "https://github.com/sebastianbergmann/php-code-coverage/issues",
+                "security": "https://github.com/sebastianbergmann/php-code-coverage/security/policy",
+                "source": "https://github.com/sebastianbergmann/php-code-coverage/tree/11.0.3"
+            },
+            "funding": [
+                {
+                    "url": "https://github.com/sebastianbergmann",
+                    "type": "github"
+                }
+            ],
+            "time": "2024-03-12T15:35:40+00:00"
+        },
+        {
+            "name": "phpunit/php-file-iterator",
+            "version": "5.0.0",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/sebastianbergmann/php-file-iterator.git",
+                "reference": "99e95c94ad9500daca992354fa09d7b99abe2210"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/sebastianbergmann/php-file-iterator/zipball/99e95c94ad9500daca992354fa09d7b99abe2210",
+                "reference": "99e95c94ad9500daca992354fa09d7b99abe2210",
+                "shasum": ""
+            },
+            "require": {
+                "php": ">=8.2"
+            },
+            "require-dev": {
+                "phpunit/phpunit": "^11.0"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-main": "5.0-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": "FilterIterator implementation that filters files based on a list of suffixes.",
+            "homepage": "https://github.com/sebastianbergmann/php-file-iterator/",
+            "keywords": [
+                "filesystem",
+                "iterator"
+            ],
+            "support": {
+                "issues": "https://github.com/sebastianbergmann/php-file-iterator/issues",
+                "security": "https://github.com/sebastianbergmann/php-file-iterator/security/policy",
+                "source": "https://github.com/sebastianbergmann/php-file-iterator/tree/5.0.0"
+            },
+            "funding": [
+                {
+                    "url": "https://github.com/sebastianbergmann",
+                    "type": "github"
+                }
+            ],
+            "time": "2024-02-02T06:05:04+00:00"
+        },
+        {
+            "name": "phpunit/php-invoker",
+            "version": "5.0.0",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/sebastianbergmann/php-invoker.git",
+                "reference": "5d8d9355a16d8cc5a1305b0a85342cfa420612be"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/sebastianbergmann/php-invoker/zipball/5d8d9355a16d8cc5a1305b0a85342cfa420612be",
+                "reference": "5d8d9355a16d8cc5a1305b0a85342cfa420612be",
+                "shasum": ""
+            },
+            "require": {
+                "php": ">=8.2"
+            },
+            "require-dev": {
+                "ext-pcntl": "*",
+                "phpunit/phpunit": "^11.0"
+            },
+            "suggest": {
+                "ext-pcntl": "*"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-main": "5.0-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": "Invoke callables with a timeout",
+            "homepage": "https://github.com/sebastianbergmann/php-invoker/",
+            "keywords": [
+                "process"
+            ],
+            "support": {
+                "issues": "https://github.com/sebastianbergmann/php-invoker/issues",
+                "security": "https://github.com/sebastianbergmann/php-invoker/security/policy",
+                "source": "https://github.com/sebastianbergmann/php-invoker/tree/5.0.0"
+            },
+            "funding": [
+                {
+                    "url": "https://github.com/sebastianbergmann",
+                    "type": "github"
+                }
+            ],
+            "time": "2024-02-02T06:05:50+00:00"
+        },
+        {
+            "name": "phpunit/php-text-template",
+            "version": "4.0.0",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/sebastianbergmann/php-text-template.git",
+                "reference": "d38f6cbff1cdb6f40b03c9811421561668cc133e"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/sebastianbergmann/php-text-template/zipball/d38f6cbff1cdb6f40b03c9811421561668cc133e",
+                "reference": "d38f6cbff1cdb6f40b03c9811421561668cc133e",
+                "shasum": ""
+            },
+            "require": {
+                "php": ">=8.2"
+            },
+            "require-dev": {
+                "phpunit/phpunit": "^11.0"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-main": "4.0-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": "Simple template engine.",
+            "homepage": "https://github.com/sebastianbergmann/php-text-template/",
+            "keywords": [
+                "template"
+            ],
+            "support": {
+                "issues": "https://github.com/sebastianbergmann/php-text-template/issues",
+                "security": "https://github.com/sebastianbergmann/php-text-template/security/policy",
+                "source": "https://github.com/sebastianbergmann/php-text-template/tree/4.0.0"
+            },
+            "funding": [
+                {
+                    "url": "https://github.com/sebastianbergmann",
+                    "type": "github"
+                }
+            ],
+            "time": "2024-02-02T06:06:56+00:00"
+        },
+        {
+            "name": "phpunit/php-timer",
+            "version": "7.0.0",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/sebastianbergmann/php-timer.git",
+                "reference": "8a59d9e25720482ee7fcdf296595e08795b84dc5"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/sebastianbergmann/php-timer/zipball/8a59d9e25720482ee7fcdf296595e08795b84dc5",
+                "reference": "8a59d9e25720482ee7fcdf296595e08795b84dc5",
+                "shasum": ""
+            },
+            "require": {
+                "php": ">=8.2"
+            },
+            "require-dev": {
+                "phpunit/phpunit": "^11.0"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-main": "7.0-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": "Utility class for timing",
+            "homepage": "https://github.com/sebastianbergmann/php-timer/",
+            "keywords": [
+                "timer"
+            ],
+            "support": {
+                "issues": "https://github.com/sebastianbergmann/php-timer/issues",
+                "security": "https://github.com/sebastianbergmann/php-timer/security/policy",
+                "source": "https://github.com/sebastianbergmann/php-timer/tree/7.0.0"
+            },
+            "funding": [
+                {
+                    "url": "https://github.com/sebastianbergmann",
+                    "type": "github"
+                }
+            ],
+            "time": "2024-02-02T06:08:01+00:00"
+        },
+        {
+            "name": "phpunit/phpunit",
+            "version": "11.1.1",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/sebastianbergmann/phpunit.git",
+                "reference": "816cb6070af901c0548aa5f18f2132fd8a6e4ade"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/sebastianbergmann/phpunit/zipball/816cb6070af901c0548aa5f18f2132fd8a6e4ade",
+                "reference": "816cb6070af901c0548aa5f18f2132fd8a6e4ade",
+                "shasum": ""
+            },
+            "require": {
+                "ext-dom": "*",
+                "ext-json": "*",
+                "ext-libxml": "*",
+                "ext-mbstring": "*",
+                "ext-xml": "*",
+                "ext-xmlwriter": "*",
+                "myclabs/deep-copy": "^1.10.1",
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+                "type": "zip",
+                "url": "https://api.github.com/repos/sebastianbergmann/lines-of-code/zipball/376c5b3f6b43c78fdc049740bca76a7c846706c0",
+                "reference": "376c5b3f6b43c78fdc049740bca76a7c846706c0",
+                "shasum": ""
+            },
+            "require": {
+                "nikic/php-parser": "^5.0",
+                "php": ">=8.2"
+            },
+            "require-dev": {
+                "phpunit/phpunit": "^11.0"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-main": "3.0-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": "Library for counting the lines of code in PHP source code",
+            "homepage": "https://github.com/sebastianbergmann/lines-of-code",
+            "support": {
+                "issues": "https://github.com/sebastianbergmann/lines-of-code/issues",
+                "security": "https://github.com/sebastianbergmann/lines-of-code/security/policy",
+                "source": "https://github.com/sebastianbergmann/lines-of-code/tree/3.0.0"
+            },
+            "funding": [
+                {
+                    "url": "https://github.com/sebastianbergmann",
+                    "type": "github"
+                }
+            ],
+            "time": "2024-02-02T06:00:36+00:00"
+        },
+        {
+            "name": "sebastian/object-enumerator",
+            "version": "6.0.0",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/sebastianbergmann/object-enumerator.git",
+                "reference": "f75f6c460da0bbd9668f43a3dde0ec0ba7faa678"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/sebastianbergmann/object-enumerator/zipball/f75f6c460da0bbd9668f43a3dde0ec0ba7faa678",
+                "reference": "f75f6c460da0bbd9668f43a3dde0ec0ba7faa678",
+                "shasum": ""
+            },
+            "require": {
+                "php": ">=8.2",
+                "sebastian/object-reflector": "^4.0",
+                "sebastian/recursion-context": "^6.0"
+            },
+            "require-dev": {
+                "phpunit/phpunit": "^11.0"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-main": "6.0-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/",
+            "support": {
+                "issues": "https://github.com/sebastianbergmann/object-enumerator/issues",
+                "security": "https://github.com/sebastianbergmann/object-enumerator/security/policy",
+                "source": "https://github.com/sebastianbergmann/object-enumerator/tree/6.0.0"
+            },
+            "funding": [
+                {
+                    "url": "https://github.com/sebastianbergmann",
+                    "type": "github"
+                }
+            ],
+            "time": "2024-02-02T06:01:29+00:00"
+        },
+        {
+            "name": "sebastian/object-reflector",
+            "version": "4.0.0",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/sebastianbergmann/object-reflector.git",
+                "reference": "bb2a6255d30853425fd38f032eb64ced9f7f132d"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/sebastianbergmann/object-reflector/zipball/bb2a6255d30853425fd38f032eb64ced9f7f132d",
+                "reference": "bb2a6255d30853425fd38f032eb64ced9f7f132d",
+                "shasum": ""
+            },
+            "require": {
+                "php": ">=8.2"
+            },
+            "require-dev": {
+                "phpunit/phpunit": "^11.0"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-main": "4.0-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/",
+            "support": {
+                "issues": "https://github.com/sebastianbergmann/object-reflector/issues",
+                "security": "https://github.com/sebastianbergmann/object-reflector/security/policy",
+                "source": "https://github.com/sebastianbergmann/object-reflector/tree/4.0.0"
+            },
+            "funding": [
+                {
+                    "url": "https://github.com/sebastianbergmann",
+                    "type": "github"
+                }
+            ],
+            "time": "2024-02-02T06:02:18+00:00"
+        },
+        {
+            "name": "sebastian/recursion-context",
+            "version": "6.0.0",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/sebastianbergmann/recursion-context.git",
+                "reference": "b75224967b5a466925c6d54e68edd0edf8dd4ed4"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/sebastianbergmann/recursion-context/zipball/b75224967b5a466925c6d54e68edd0edf8dd4ed4",
+                "reference": "b75224967b5a466925c6d54e68edd0edf8dd4ed4",
+                "shasum": ""
+            },
+            "require": {
+                "php": ">=8.2"
+            },
+            "require-dev": {
+                "phpunit/phpunit": "^11.0"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-main": "6.0-dev"
+                }
+            },
+            "autoload": {
+                "classmap": [
+                    "src/"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "BSD-3-Clause"
+            ],
+            "authors": [
+                {
+                    "name": "Sebastian Bergmann",
+                    "email": "sebastian@phpunit.de"
+                },
+                {
+                    "name": "Jeff Welch",
+                    "email": "whatthejeff@gmail.com"
+                },
+                {
+                    "name": "Adam Harvey",
+                    "email": "aharvey@php.net"
+                }
+            ],
+            "description": "Provides functionality to recursively process PHP variables",
+            "homepage": "https://github.com/sebastianbergmann/recursion-context",
+            "support": {
+                "issues": "https://github.com/sebastianbergmann/recursion-context/issues",
+                "security": "https://github.com/sebastianbergmann/recursion-context/security/policy",
+                "source": "https://github.com/sebastianbergmann/recursion-context/tree/6.0.0"
+            },
+            "funding": [
+                {
+                    "url": "https://github.com/sebastianbergmann",
+                    "type": "github"
+                }
+            ],
+            "time": "2024-02-02T06:08:48+00:00"
+        },
+        {
+            "name": "sebastian/type",
+            "version": "5.0.0",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/sebastianbergmann/type.git",
+                "reference": "b8502785eb3523ca0dd4afe9ca62235590020f3f"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/sebastianbergmann/type/zipball/b8502785eb3523ca0dd4afe9ca62235590020f3f",
+                "reference": "b8502785eb3523ca0dd4afe9ca62235590020f3f",
+                "shasum": ""
+            },
+            "require": {
+                "php": ">=8.2"
+            },
+            "require-dev": {
+                "phpunit/phpunit": "^11.0"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-main": "5.0-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",
+            "support": {
+                "issues": "https://github.com/sebastianbergmann/type/issues",
+                "security": "https://github.com/sebastianbergmann/type/security/policy",
+                "source": "https://github.com/sebastianbergmann/type/tree/5.0.0"
+            },
+            "funding": [
+                {
+                    "url": "https://github.com/sebastianbergmann",
+                    "type": "github"
+                }
+            ],
+            "time": "2024-02-02T06:09:34+00:00"
+        },
+        {
+            "name": "sebastian/version",
+            "version": "5.0.0",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/sebastianbergmann/version.git",
+                "reference": "13999475d2cb1ab33cb73403ba356a814fdbb001"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/sebastianbergmann/version/zipball/13999475d2cb1ab33cb73403ba356a814fdbb001",
+                "reference": "13999475d2cb1ab33cb73403ba356a814fdbb001",
+                "shasum": ""
+            },
+            "require": {
+                "php": ">=8.2"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-main": "5.0-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": "Library that helps with managing the version number of Git-hosted PHP projects",
+            "homepage": "https://github.com/sebastianbergmann/version",
+            "support": {
+                "issues": "https://github.com/sebastianbergmann/version/issues",
+                "security": "https://github.com/sebastianbergmann/version/security/policy",
+                "source": "https://github.com/sebastianbergmann/version/tree/5.0.0"
+            },
+            "funding": [
+                {
+                    "url": "https://github.com/sebastianbergmann",
+                    "type": "github"
+                }
+            ],
+            "time": "2024-02-02T06:10:47+00:00"
+        },
+        {
+            "name": "theseer/tokenizer",
+            "version": "1.2.3",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/theseer/tokenizer.git",
+                "reference": "737eda637ed5e28c3413cb1ebe8bb52cbf1ca7a2"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/theseer/tokenizer/zipball/737eda637ed5e28c3413cb1ebe8bb52cbf1ca7a2",
+                "reference": "737eda637ed5e28c3413cb1ebe8bb52cbf1ca7a2",
+                "shasum": ""
+            },
+            "require": {
+                "ext-dom": "*",
+                "ext-tokenizer": "*",
+                "ext-xmlwriter": "*",
+                "php": "^7.2 || ^8.0"
+            },
+            "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",
+            "support": {
+                "issues": "https://github.com/theseer/tokenizer/issues",
+                "source": "https://github.com/theseer/tokenizer/tree/1.2.3"
+            },
+            "funding": [
+                {
+                    "url": "https://github.com/theseer",
+                    "type": "github"
+                }
+            ],
+            "time": "2024-03-03T12:36:25+00:00"
+        }
+    ],
+    "aliases": [],
+    "minimum-stability": "stable",
+    "stability-flags": [],
+    "prefer-stable": false,
+    "prefer-lowest": false,
+    "platform": {
+        "php": ">=5.6",
+        "ext-mbstring": "*"
+    },
+    "platform-dev": [],
+    "plugin-api-version": "2.6.0"
+}
diff --git a/phpunit.xml b/phpunit.xml
new file mode 100644
index 0000000..718f6ca
--- /dev/null
+++ b/phpunit.xml
@@ -0,0 +1,13 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<phpunit xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" bootstrap="tests/bootstrap.php" xsi:noNamespaceSchemaLocation="https://schema.phpunit.de/11.1/phpunit.xsd" cacheDirectory=".phpunit.cache">
+  <testsuites>
+    <testsuite name="Application Test Suite">
+      <directory suffix="Test.php">./tests</directory>
+    </testsuite>
+  </testsuites>
+  <source>
+    <include>
+      <directory suffix=".php">./src</directory>
+    </include>
+  </source>
+</phpunit>
diff --git a/phpunit.xml.dist b/phpunit.xml.dist
deleted file mode 100644
index 08d596f..0000000
--- a/phpunit.xml.dist
+++ /dev/null
@@ -1,13 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<phpunit bootstrap="./tests/bootstrap.php" colors="true">
-    <testsuites>
-        <testsuite>
-            <directory>tests</directory>
-        </testsuite>
-    </testsuites>
-    <filter>
-        <whitelist>
-            <directory suffix=".php">src</directory>
-        </whitelist>
-    </filter>
-</phpunit>
\ No newline at end of file
diff --git a/src/Client.php b/src/Client.php
index 3d9f1b4..d99dd2b 100644
--- a/src/Client.php
+++ b/src/Client.php
@@ -29,7 +29,7 @@ class Client
     /**
      * @var string
      */
-    private $userAgent = 'PHP SDK v2.1.2';
+    private $userAgent = 'PHP SDK v2.2.0';
 
 
     /**
diff --git a/tests/AutocorrectTest.php b/tests/AutocorrectTest.php
index 767317c..113ef2c 100644
--- a/tests/AutocorrectTest.php
+++ b/tests/AutocorrectTest.php
@@ -9,7 +9,7 @@ class AutocorrectTest extends \PHPUnit\Framework\TestCase
 {
     private $_oObject;
 
-    public function setUp()
+    public function setUp(): void
     {
         $this->_oObject = new Autocorrect();
     }
diff --git a/tests/ClientTest.php b/tests/ClientTest.php
index b0139b2..8b0aaf2 100644
--- a/tests/ClientTest.php
+++ b/tests/ClientTest.php
@@ -6,6 +6,8 @@
 use Barzahlen\Request\CreateRequest;
 use Barzahlen\Request\InvalidateRequest;
 
+use ReflectionClass;
+
 class ClientTest extends \PHPUnit\Framework\TestCase
 {
     /**
@@ -18,21 +20,31 @@ class ClientTest extends \PHPUnit\Framework\TestCase
      */
     private $userAgent = 'PHP SDK v2.2.0';
 
-    public function setUp()
+    public function setUp(): void
     {
         $this->client = new Client(DIVISIONID, PAYMENTKEY);
     }
 
     public function testDefaultUserAgent()
     {
-        $this->assertAttributeEquals($this->userAgent, 'userAgent', $this->client);
+        $reflection = new ReflectionClass($this->client);
+        $property = $reflection->getProperty('userAgent');
+        $property->setAccessible(true);
+        $actualUserAgent = $property->getValue($this->client);
+
+        $this->assertEquals($this->userAgent, $actualUserAgent);
     }
 
     public function testSetUserAgent()
     {
         $this->client->setUserAgent('Shopsystem v2.2.0');
 
-        $this->assertAttributeEquals('Shopsystem v2.2.0', 'userAgent', $this->client);
+        $reflection = new ReflectionClass($this->client);
+        $property = $reflection->getProperty('userAgent');
+        $property->setAccessible(true);
+        $actualUserAgent = $property->getValue($this->client);
+
+        $this->assertEquals('Shopsystem v2.2.0', $actualUserAgent);
     }
 
     public function testBuildHeaderWithIdempotency()
@@ -44,10 +56,10 @@ public function testBuildHeaderWithIdempotency()
 
         $header = $this->client->buildHeader($request);
         $this->assertEquals('Host: api.viafintech.com', $header[0]);
-        $this->assertContains('Date: ', $header[1]);
+        $this->assertStringContainsString('Date: ', $header[1]);
         $this->assertEquals('User-Agent: '.$this->userAgent, $header[2]);
-        $this->assertRegExp('/^Authorization: BZ1-HMAC-SHA256 DivisionId=12345, Signature=[a-f0-9]{64}$/', $header[3]);
-        $this->assertRegExp('/^Idempotency-Key: [a-f0-9]{32}$/', $header[4]);
+        $this->assertMatchesRegularExpression('/^Authorization: BZ1-HMAC-SHA256 DivisionId=12345, Signature=[a-f0-9]{64}$/', $header[3]);
+        $this->assertMatchesRegularExpression('/^Idempotency-Key: [a-f0-9]{32}$/', $header[4]);
     }
 
     public function testBuildHeaderWithoutIdempotencyForSandbox()
@@ -57,9 +69,9 @@ public function testBuildHeaderWithoutIdempotencyForSandbox()
 
         $header = $client->buildHeader($request);
         $this->assertEquals('Host: api-sandbox.viafintech.com', $header[0]);
-        $this->assertContains('Date: ', $header[1]);
+        $this->assertStringContainsString('Date: ', $header[1]);
         $this->assertEquals('User-Agent: '.$this->userAgent, $header[2]);
-        $this->assertRegExp('/^Authorization: BZ1-HMAC-SHA256 DivisionId=12345, Signature=[a-f0-9]{64}$/', $header[3]);
+        $this->assertMatchesRegularExpression('/^Authorization: BZ1-HMAC-SHA256 DivisionId=12345, Signature=[a-f0-9]{64}$/', $header[3]);
         $this->assertArrayNotHasKey(4, $header);
     }
 
@@ -69,92 +81,92 @@ public function testNoneError()
         $this->assertNull($this->client->checkResponse($response, 'application/json;charset=utf-8'));
     }
 
-    /**
-     * @expectedException \Barzahlen\Exception\AuthException
-     */
     public function testAuthError()
     {
+        $this->expectException(\Barzahlen\Exception\AuthException::class);
+        $this->expectExceptionMessage("error message");
+
         $response = '{"error_class":"auth","error_code":"invalid_signature","message":"error message","request_id":"r3qu3s71d"}';
         $this->client->checkResponse($response, 'application/json;charset=utf-8');
     }
 
-    /**
-     * @expectedException \Barzahlen\Exception\IdempotencyException
-     */
     public function testIdempotencyError()
     {
+        $this->expectException(\Barzahlen\Exception\IdempotencyException::class);
+        $this->expectExceptionMessage("error message");
+
         $response = '{"error_class":"idempotency","error_code":"use_idempotency_key_twice","message":"error message","request_id":"r3qu3s71d"}';
         $this->client->checkResponse($response, 'application/json;charset=utf-8');
     }
 
-    /**
-     * @expectedException \Barzahlen\Exception\InvalidFormatException
-     */
     public function testInvalidFormatError()
     {
+        $this->expectException(\Barzahlen\Exception\InvalidFormatException::class);
+        $this->expectExceptionMessage("error message");
+
         $response = '{"error_class":"invalid_format","error_code":"bad_json_format","message":"error message","request_id":"r3qu3s71d"}';
         $this->client->checkResponse($response, 'application/json;charset=utf-8');
     }
 
-    /**
-     * @expectedException \Barzahlen\Exception\InvalidParameterException
-     */
     public function testInvalidParameterError()
     {
+        $this->expectException(\Barzahlen\Exception\InvalidParameterException::class);
+        $this->expectExceptionMessage("error message");
+
         $response = '{"error_class":"invalid_parameter","error_code":"invalid_slip_type","message":"error message","request_id":"r3qu3s71d"}';
         $this->client->checkResponse($response, 'application/json;charset=utf-8');
     }
 
-    /**
-     * @expectedException \Barzahlen\Exception\InvalidStateException
-     */
     public function testInvalidStateError()
     {
+        $this->expectException(\Barzahlen\Exception\InvalidStateException::class);
+        $this->expectExceptionMessage("error message");
+
         $response = '{"error_class":"invalid_state","error_code":"invalid_slip_state","message":"error message","request_id":"r3qu3s71d"}';
         $this->client->checkResponse($response, 'application/json;charset=utf-8');
     }
 
-    /**
-     * @expectedException \Barzahlen\Exception\NotAllowedException
-     */
     public function testNotAllowedError()
     {
+        $this->expectException(\Barzahlen\Exception\NotAllowedException::class);
+        $this->expectExceptionMessage("error message");
+
         $response = '{"error_class":"not_allowed","error_code":"method_not_allowed","message":"error message","request_id":"r3qu3s71d"}';
         $this->client->checkResponse($response, 'application/json;charset=utf-8');
     }
 
-    /**
-     * @expectedException \Barzahlen\Exception\RateLimitException
-     */
     public function testRateLimitError()
     {
+        $this->expectException(\Barzahlen\Exception\RateLimitException::class);
+        $this->expectExceptionMessage("error message");
+
         $response = '{"error_class":"rate_limit","error_code":"rate_limit_exceeded","message":"error message","request_id":"r3qu3s71d"}';
         $this->client->checkResponse($response, 'application/json;charset=utf-8');
     }
 
-    /**
-     * @expectedException \Barzahlen\Exception\ServerException
-     */
     public function testServerError()
     {
+        $this->expectException(\Barzahlen\Exception\ServerException::class);
+        $this->expectExceptionMessage("error message");
+
         $response = '{"error_class":"server_error","error_code":"internal_server_error","message":"error message","request_id":"r3qu3s71d"}';
         $this->client->checkResponse($response, 'application/json;charset=utf-8');
     }
 
-    /**
-     * @expectedException \Barzahlen\Exception\TransportException
-     */
     public function testTransportError()
     {
+        $this->expectException(\Barzahlen\Exception\TransportException::class);
+        $this->expectExceptionMessage("error message");
+
         $response = '{"error_class":"transport","error_code":"invalid_host_header","message":"error message","request_id":"r3qu3s71d"}';
         $this->client->checkResponse($response, 'application/json;charset=utf-8');
     }
 
-    /**
-     * @expectedException \Barzahlen\Exception\ApiException
-     */
     public function testUnknownError()
     {
+        $this->expectException(\Barzahlen\Exception\ApiException::class);
+        $this->expectExceptionMessage("error message");
+
         $response = '{"error_class":"unknown","error_code":"unknown_error","message":"error message","request_id":"r3qu3s71d"}';
         $this->client->checkResponse($response, 'application/json;charset=utf-8');
     }
diff --git a/tests/Request/CreateRequestTest.php b/tests/Request/CreateRequestTest.php
index 4256bf4..3fddf90 100644
--- a/tests/Request/CreateRequestTest.php
+++ b/tests/Request/CreateRequestTest.php
@@ -12,7 +12,7 @@ class CreateRequestTest extends \PHPUnit\Framework\TestCase
     private $request;
 
 
-    public function setUp()
+    public function setUp(): void
     {
         $this->request = new CreateRequest();
     }
diff --git a/tests/Request/InvalidateRequestTest.php b/tests/Request/InvalidateRequestTest.php
index c65e654..c275a54 100644
--- a/tests/Request/InvalidateRequestTest.php
+++ b/tests/Request/InvalidateRequestTest.php
@@ -12,7 +12,7 @@ class InvalidateRequestTest extends \PHPUnit\Framework\TestCase
     private $request;
 
 
-    public function setUp()
+    public function setUp(): void
     {
         $this->request = new InvalidateRequest('slp-d90ab05c-69f2-4e87-9972-97b3275a0ccd');
     }
diff --git a/tests/Request/ResendRequestTest.php b/tests/Request/ResendRequestTest.php
index 72c3a1a..0132d96 100644
--- a/tests/Request/ResendRequestTest.php
+++ b/tests/Request/ResendRequestTest.php
@@ -17,7 +17,7 @@ class ResendRequestTest extends \PHPUnit\Framework\TestCase
     private $requestTextMessage;
 
 
-    public function setUp()
+    public function setUp(): void
     {
         $this->requestEmail = new ResendRequest('slp-d90ab05c-69f2-4e87-9972-97b3275a0ccd', 'email');
         $this->requestTextMessage = new ResendRequest('slp-d90ab05c-69f2-4e87-9972-97b3275a0ccd', 'text_message');
diff --git a/tests/Request/RetrieveRequestTest.php b/tests/Request/RetrieveRequestTest.php
index 514bfe3..64ff916 100644
--- a/tests/Request/RetrieveRequestTest.php
+++ b/tests/Request/RetrieveRequestTest.php
@@ -12,7 +12,7 @@ class RetrieveRequestTest extends \PHPUnit\Framework\TestCase
     private $request;
 
 
-    public function setUp()
+    public function setUp(): void
     {
         $this->request = new RetrieveRequest('slp-d90ab05c-69f2-4e87-9972-97b3275a0ccd');
     }
diff --git a/tests/Request/UpdateRequestTest.php b/tests/Request/UpdateRequestTest.php
index d190180..70f9954 100644
--- a/tests/Request/UpdateRequestTest.php
+++ b/tests/Request/UpdateRequestTest.php
@@ -12,7 +12,7 @@ class UpdateRequestTest extends \PHPUnit\Framework\TestCase
     private $request;
 
 
-    public function setUp()
+    public function setUp(): void
     {
         $this->request = new UpdateRequest('slp-d90ab05c-69f2-4e87-9972-97b3275a0ccd');
     }
diff --git a/tests/SanitizeTest.php b/tests/SanitizeTest.php
index efa0370..3a0b45a 100644
--- a/tests/SanitizeTest.php
+++ b/tests/SanitizeTest.php
@@ -9,7 +9,7 @@ class SanitizeTest extends \PHPUnit\Framework\TestCase
 {
     private $_oObject;
     
-    public function setUp()
+    public function setUp(): void
     {
         $this->_oObject = new Sanitize();
     }
diff --git a/tests/TranslateTest.php b/tests/TranslateTest.php
index b710106..2d8d3b0 100644
--- a/tests/TranslateTest.php
+++ b/tests/TranslateTest.php
@@ -6,21 +6,21 @@
 
 class TranslateTest extends \PHPUnit\Framework\TestCase
 {
-    public function setUp()
+    public function setUp(): void
     {
     }
 
     public function testSimpleTranslation()
     {
         Translate::$bShowTranslationWarnings = true;
-        $this->assertContains('OK', Translate::__T('Test'));
+        $this->assertStringContainsString('OK', Translate::__T('Test'));
     }
 
     public function testTranslationWithVariable()
     {
         Translate::$bShowTranslationWarnings = true;
-        $this->assertContains('20', Translate::__T('Test %s of %s', array(20,100)),"",true);
-        $this->assertContains('100', Translate::__T('Test %s of %s', array(20,100)),'',true);
-        $this->assertContains('Ok', Translate::__T('Test %s of %s', array(20,100)),'',true);
+        $this->assertStringContainsString('20', Translate::__T('Test %s of %s', array(20,100)),"",true);
+        $this->assertStringContainsString('100', Translate::__T('Test %s of %s', array(20,100)),'',true);
+        $this->assertStringContainsStringIgnoringCase('Ok', Translate::__T('Test %s of %s', array(20,100)),'',true);
     }
 }
diff --git a/tests/ValidationTest.php b/tests/ValidationTest.php
index d9d88a7..e22b29b 100644
--- a/tests/ValidationTest.php
+++ b/tests/ValidationTest.php
@@ -8,7 +8,7 @@ class ValidationTest extends \PHPUnit\Framework\TestCase
 {
     private $_oObject;
     
-    public function setUp()
+    public function setUp(): void
     {
         $this->_oObject = new Validate();
     }
diff --git a/tests/WebhookTest.php b/tests/WebhookTest.php
index 01c5296..4212376 100644
--- a/tests/WebhookTest.php
+++ b/tests/WebhookTest.php
@@ -22,7 +22,7 @@ class WebhookTest extends \PHPUnit\Framework\TestCase
     private $body;
 
 
-    public function setUp()
+    public function setUp(): void
     {
         $this->webhook = new Webhook(PAYMENTKEY);