diff --git a/.github/FUNDING.yml b/.github/FUNDING.yml
new file mode 100644
index 0000000..3bb4178
--- /dev/null
+++ b/.github/FUNDING.yml
@@ -0,0 +1 @@
+custom: https://enflow.nl/contact
diff --git a/.github/workflows/php-cs-fixer.yml b/.github/workflows/php-cs-fixer.yml
new file mode 100644
index 0000000..a83d708
--- /dev/null
+++ b/.github/workflows/php-cs-fixer.yml
@@ -0,0 +1,23 @@
+name: Check & fix styling
+
+on: [push]
+
+jobs:
+  php-cs-fixer:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v2
+        with:
+          ref: ${{ github.head_ref }}
+
+      - name: Run PHP CS Fixer
+        uses: docker://oskarstark/php-cs-fixer-ga
+        with:
+          args: --config=.php-cs-fixer.dist.php --allow-risky=yes
+
+      - name: Commit changes
+        uses: stefanzweifel/git-auto-commit-action@v4
+        with:
+          commit_message: Fix styling
diff --git a/.github/workflows/run-tests.yml b/.github/workflows/run-tests.yml
new file mode 100644
index 0000000..06b4e1e
--- /dev/null
+++ b/.github/workflows/run-tests.yml
@@ -0,0 +1,29 @@
+name: run-tests
+
+on: [push, pull_request]
+
+jobs:
+    test:
+        runs-on: ${{ matrix.os }}
+        strategy:
+            fail-fast: true
+            matrix:
+                os: [ubuntu-latest]
+                php: [8.0, 7.4]
+                dependency-version: [prefer-lowest, prefer-stable]
+
+        name: P${{ matrix.php }} - ${{ matrix.dependency-version }} - ${{ matrix.os }}
+
+        steps:
+            -   name: Checkout code
+                uses: actions/checkout@v2
+
+            -   name: Setup PHP
+                uses: shivammathur/setup-php@v2
+                with:
+                    php-version: ${{ matrix.php }}
+                    extensions: dom, curl, libxml, mbstring, zip
+                    coverage: none
+
+            -   name: Install dependencies
+                run: composer update ${COMPOSER_FLAGS} --no-interaction --prefer-source
diff --git a/.gitignore b/.gitignore
index 4f6ebc2..06fe4c7 100644
--- a/.gitignore
+++ b/.gitignore
@@ -2,3 +2,4 @@
 .phpunit.result.cache
 composer.lock
 vendor
+.php-cs-fixer.cache
diff --git a/.php-cs-fixer.dist.php b/.php-cs-fixer.dist.php
new file mode 100644
index 0000000..f5124b6
--- /dev/null
+++ b/.php-cs-fixer.dist.php
@@ -0,0 +1,42 @@
+<?php
+
+use PhpCsFixer\Config;
+use PhpCsFixer\Finder;
+
+$finder = Finder::create()
+    ->in([
+        __DIR__ . '/src',
+        __DIR__ . '/tests',
+    ])
+    ->notPath('bootstrap/*')
+    ->notPath('storage/*')
+    ->notPath('resources/view/mail/*')
+    ->name('*.php')
+    ->notName('*.blade.php')
+    ->ignoreDotFiles(true)
+    ->ignoreVCS(true)
+;
+
+return (new Config())
+    ->setRules([
+        '@PSR2' => true,
+        'array_syntax' => ['syntax' => 'short'],
+        'ordered_imports' => ['sort_algorithm' => 'alpha'],
+        'no_unused_imports' => true,
+        'not_operator_with_successor_space' => true,
+        'trailing_comma_in_multiline' => true,
+        'phpdoc_scalar' => true,
+        'unary_operator_spaces' => true,
+        'binary_operator_spaces' => true,
+        'blank_line_before_statement' => [
+            'statements' => ['break', 'continue', 'declare', 'return', 'throw', 'try'],
+        ],
+        'phpdoc_single_line_var_spacing' => true,
+        'phpdoc_var_without_name' => true,
+        'method_argument_space' => [
+            'on_multiline' => 'ensure_fully_multiline',
+            'keep_multiple_spaces_after_comma' => true,
+        ],
+        'single_trait_insert_per_statement' => true,
+    ])
+    ->setFinder($finder);
diff --git a/.php_cs b/.php_cs
deleted file mode 100644
index 89e01a7..0000000
--- a/.php_cs
+++ /dev/null
@@ -1,13 +0,0 @@
-<?php
-
-$finder = Symfony\CS\Finder\DefaultFinder::create()
-    ->exclude('vendor')
-    ->in(__DIR__);
-
-return Symfony\CS\Config\Config::create()
-    ->setUsingCache(true)
-    ->level(Symfony\CS\FixerInterface::PSR2_LEVEL)
-    ->fixers([
-         'short_array_syntax',
-     ])
-    ->finder($finder);
diff --git a/.travis.yml b/.travis.yml
deleted file mode 100644
index 6844630..0000000
--- a/.travis.yml
+++ /dev/null
@@ -1,27 +0,0 @@
-language: php
-dist: xenial
-
-php:
-  - 7.2
-  - 7.3
-  - 7.4
-
-sudo: required
-
-before_install:
-  - sudo add-apt-repository ppa:libreoffice/ppa -y
-  - sudo apt-get update -qq
-  - sudo apt-get install -y libreoffice unoconv
-  - sudo mkdir -p /home/travis/.config/libreoffice
-  - sudo chmod 777 /home/travis/.config/libreoffice
-
-env:
-  matrix:
-    - COMPOSER_FLAGS="--prefer-lowest"
-
-before_script:
-  - travis_retry composer self-update
-  - travis_retry composer update ${COMPOSER_FLAGS} --no-interaction --prefer-source
-
-script:
-  - phpunit
diff --git a/composer.json b/composer.json
index 06080d7..983c9f1 100644
--- a/composer.json
+++ b/composer.json
@@ -15,12 +15,13 @@
         }
     ],
     "require": {
-        "php": "^7.2.5",
-        "phpoffice/phpword": "^0.17.0",
+        "php": "^7.4|^8.0",
+        "phpoffice/phpword": "^0.18.2",
         "symfony/process": "^4.2 || ^5.0"
     },
     "require-dev": {
-        "phpunit/phpunit": "^8.1"
+        "phpunit/phpunit": "^9.0",
+        "friendsofphp/php-cs-fixer": "^3.0"
     },
     "autoload": {
         "psr-4": {
@@ -33,6 +34,7 @@
         }
     },
     "scripts": {
-        "test": "vendor/bin/phpunit"
+        "test": "vendor/bin/phpunit",
+        "format": "vendor/bin/php-cs-fixer fix --allow-risky=yes"
     }
 }
diff --git a/phpunit.xml.dist b/phpunit.xml.dist
index ec7bfdc..4fadc5b 100644
--- a/phpunit.xml.dist
+++ b/phpunit.xml.dist
@@ -1,22 +1,13 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<phpunit bootstrap="vendor/autoload.php"
-         backupGlobals="false"
-         backupStaticAttributes="false"
-         colors="true"
-         verbose="true"
-         convertErrorsToExceptions="true"
-         convertNoticesToExceptions="true"
-         convertWarningsToExceptions="true"
-         processIsolation="false"
-         stopOnFailure="false">
+<phpunit xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" bootstrap="vendor/autoload.php" backupGlobals="false" backupStaticAttributes="false" colors="true" verbose="true" convertErrorsToExceptions="true" convertNoticesToExceptions="true" convertWarningsToExceptions="true" processIsolation="false" stopOnFailure="false" xsi:noNamespaceSchemaLocation="https://schema.phpunit.de/9.3/phpunit.xsd">
+    <coverage>
+        <include>
+            <directory suffix=".php">src/</directory>
+        </include>
+    </coverage>
     <testsuites>
-        <testsuite name="Enflow's Document Replacer">
+        <testsuite name="enflow/document-replacer">
             <directory>tests</directory>
         </testsuite>
     </testsuites>
-    <filter>
-        <whitelist>
-            <directory suffix=".php">src/</directory>
-        </whitelist>
-    </filter>
 </phpunit>
diff --git a/src/Converters/AbstractConverter.php b/src/Converters/AbstractConverter.php
index 68aa3c7..8f3f8ef 100644
--- a/src/Converters/AbstractConverter.php
+++ b/src/Converters/AbstractConverter.php
@@ -6,7 +6,7 @@
 
 abstract class AbstractConverter
 {
-    private $documentReplacer;
+    private DocumentReplacer $documentReplacer;
 
     private function __construct(DocumentReplacer $documentReplacer)
     {
diff --git a/src/Converters/UnoconvConverter.php b/src/Converters/UnoconvConverter.php
index 5ed9680..e8dc321 100644
--- a/src/Converters/UnoconvConverter.php
+++ b/src/Converters/UnoconvConverter.php
@@ -7,7 +7,7 @@
 
 class UnoconvConverter extends AbstractConverter
 {
-    public $binary = '/usr/bin/unoconv';
+    public string $binary = '/usr/bin/unoconv';
 
     public function convert(string $input, string $output): void
     {
@@ -21,11 +21,11 @@ public function convert(string $input, string $output): void
         $process->mustRun();
 
         // unoconv 0.7 always appends extension to --output filename https://github.com/unoconv/unoconv/issues/307
-        if (!pathinfo($output, PATHINFO_EXTENSION) && file_exists($output . '.pdf')) {
+        if (! pathinfo($output, PATHINFO_EXTENSION) && file_exists($output . '.pdf')) {
             rename($output . '.pdf', $output);
         }
 
-        if (!file_exists($output)) {
+        if (! file_exists($output)) {
             throw new ConversionFailed("Unable to convert document to PDF through unoconv");
         }
     }
diff --git a/src/DocumentReplacer.php b/src/DocumentReplacer.php
index 62188e1..0b6363c 100644
--- a/src/DocumentReplacer.php
+++ b/src/DocumentReplacer.php
@@ -2,10 +2,10 @@
 
 namespace Enflow\DocumentReplacer;
 
+use Enflow\DocumentReplacer\Converters\AbstractConverter;
 use Enflow\DocumentReplacer\Exceptions\InvalidReplacement;
 use Exception;
 use PhpOffice\PhpWord\TemplateProcessor;
-use Enflow\DocumentReplacer\Converters\AbstractConverter;
 
 class DocumentReplacer
 {
@@ -30,8 +30,9 @@ public function replace(array $keyValue): self
             if ($value instanceof ValueTypes\Image) {
                 $this->templateProcessor->setImageValue($key, $value->replacements());
             } else {
-                if (!is_scalar($value) && $value !== null) {
+                if (! is_scalar($value) && $value !== null) {
                     $type = gettype($value);
+
                     throw new InvalidReplacement("Could not replace '{$key}' in template. Value must be non-scalar or null. Type is: {$type}");
                 }
 
@@ -61,7 +62,7 @@ public function save(string $outputPath): string
 
             $class::make($this)->convert($temporaryFile, $outputPath);
 
-            if (!file_exists($outputPath) || !filesize($outputPath)) {
+            if (! file_exists($outputPath) || ! filesize($outputPath)) {
                 throw new Exception("Converter failed to output valid file to {$outputPath}");
             }
 
diff --git a/src/Template.php b/src/Template.php
index d6298b1..bdb87f9 100644
--- a/src/Template.php
+++ b/src/Template.php
@@ -8,11 +8,11 @@ class Template
 {
     private function __construct(string $path)
     {
-        if (!file_exists($path)) {
+        if (! file_exists($path)) {
             throw new InvalidArgumentException("File at '{$path}' cannot be found.");
         }
 
-        if (!is_file($path)) {
+        if (! is_file($path)) {
             throw new InvalidArgumentException("File at '{$path}' must be a file.");
         }
 
diff --git a/src/ValueTypes/Image.php b/src/ValueTypes/Image.php
index 5cb5d06..4ad3c50 100644
--- a/src/ValueTypes/Image.php
+++ b/src/ValueTypes/Image.php
@@ -6,10 +6,12 @@
 
 class Image
 {
+    /** @var string|Closure */
     private $image;
-    private $ratio;
-    private $width;
-    private $height;
+
+    private ?bool $ratio = null;
+    private ?int $width = null;
+    private ?int $height = null;
 
     private function __construct($image)
     {
diff --git a/tests/ImageValueTypeTest.php b/tests/ImageValueTypeTest.php
index b8b990d..781b761 100644
--- a/tests/ImageValueTypeTest.php
+++ b/tests/ImageValueTypeTest.php
@@ -2,8 +2,6 @@
 
 namespace Enflow\DocumentReplacer\Test;
 
-use Enflow\DocumentReplacer\Converters\UnoconvConverter;
-use Enflow\DocumentReplacer\DocumentReplacer;
 use Enflow\DocumentReplacer\ValueTypes\Image;
 use PHPUnit\Framework\TestCase;
 
@@ -16,20 +14,26 @@ public function test_image_create_from_path()
 
     public function test_image_create_from_base64_with_prefix()
     {
-        $this->assertEquals('4e7e0753fd7068d368bbe516f09e321a',
-            Image::forBase64('data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABQAAAAVCAIAAADJt1n/AAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsMAAA7DAcdvqGQAAAB8SURBVDhP3YxBDoAgDAR5iEf//zPfgCutCGwp4MXEyZI0W6bh2PaYyMM8Aa/0l05UsjDvGzIoG+fWJQPHfyMDKccy4E9oOLpLeLLQ9OWJRwamz2VXNqPrm1xWMjB/M56coy0hK0PWKdHz5fRABj0f/Efm6I5o5SW+kmM8AS/fakEk7YJkAAAAAElFTkSuQmCC')->signature());
+        $this->assertEquals(
+            '4e7e0753fd7068d368bbe516f09e321a',
+            Image::forBase64('data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABQAAAAVCAIAAADJt1n/AAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsMAAA7DAcdvqGQAAAB8SURBVDhP3YxBDoAgDAR5iEf//zPfgCutCGwp4MXEyZI0W6bh2PaYyMM8Aa/0l05UsjDvGzIoG+fWJQPHfyMDKccy4E9oOLpLeLLQ9OWJRwamz2VXNqPrm1xWMjB/M56coy0hK0PWKdHz5fRABj0f/Efm6I5o5SW+kmM8AS/fakEk7YJkAAAAAElFTkSuQmCC')->signature()
+        );
     }
 
     public function test_image_create_from_base64_without_prefix()
     {
-        $this->assertEquals('4e7e0753fd7068d368bbe516f09e321a',
-            Image::forBase64('iVBORw0KGgoAAAANSUhEUgAAABQAAAAVCAIAAADJt1n/AAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsMAAA7DAcdvqGQAAAB8SURBVDhP3YxBDoAgDAR5iEf//zPfgCutCGwp4MXEyZI0W6bh2PaYyMM8Aa/0l05UsjDvGzIoG+fWJQPHfyMDKccy4E9oOLpLeLLQ9OWJRwamz2VXNqPrm1xWMjB/M56coy0hK0PWKdHz5fRABj0f/Efm6I5o5SW+kmM8AS/fakEk7YJkAAAAAElFTkSuQmCC')->signature());
+        $this->assertEquals(
+            '4e7e0753fd7068d368bbe516f09e321a',
+            Image::forBase64('iVBORw0KGgoAAAANSUhEUgAAABQAAAAVCAIAAADJt1n/AAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsMAAA7DAcdvqGQAAAB8SURBVDhP3YxBDoAgDAR5iEf//zPfgCutCGwp4MXEyZI0W6bh2PaYyMM8Aa/0l05UsjDvGzIoG+fWJQPHfyMDKccy4E9oOLpLeLLQ9OWJRwamz2VXNqPrm1xWMjB/M56coy0hK0PWKdHz5fRABj0f/Efm6I5o5SW+kmM8AS/fakEk7YJkAAAAAElFTkSuQmCC')->signature()
+        );
     }
 
     public function test_image_create_from_binary()
     {
-        $this->assertEquals('4e7e0753fd7068d368bbe516f09e321a',
-            Image::forBinary(base64_decode('iVBORw0KGgoAAAANSUhEUgAAABQAAAAVCAIAAADJt1n/AAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsMAAA7DAcdvqGQAAAB8SURBVDhP3YxBDoAgDAR5iEf//zPfgCutCGwp4MXEyZI0W6bh2PaYyMM8Aa/0l05UsjDvGzIoG+fWJQPHfyMDKccy4E9oOLpLeLLQ9OWJRwamz2VXNqPrm1xWMjB/M56coy0hK0PWKdHz5fRABj0f/Efm6I5o5SW+kmM8AS/fakEk7YJkAAAAAElFTkSuQmCC'))->signature());
+        $this->assertEquals(
+            '4e7e0753fd7068d368bbe516f09e321a',
+            Image::forBinary(base64_decode('iVBORw0KGgoAAAANSUhEUgAAABQAAAAVCAIAAADJt1n/AAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsMAAA7DAcdvqGQAAAB8SURBVDhP3YxBDoAgDAR5iEf//zPfgCutCGwp4MXEyZI0W6bh2PaYyMM8Aa/0l05UsjDvGzIoG+fWJQPHfyMDKccy4E9oOLpLeLLQ9OWJRwamz2VXNqPrm1xWMjB/M56coy0hK0PWKdHz5fRABj0f/Efm6I5o5SW+kmM8AS/fakEk7YJkAAAAAElFTkSuQmCC'))->signature()
+        );
     }
 
     public function test_image_create_lazy()
diff --git a/tests/TemplateTest.php b/tests/TemplateTest.php
index 6458eec..4f990ea 100644
--- a/tests/TemplateTest.php
+++ b/tests/TemplateTest.php
@@ -2,8 +2,6 @@
 
 namespace Enflow\DocumentReplacer\Test;
 
-use Enflow\DocumentReplacer\Converters\UnoconvConverter;
-use Enflow\DocumentReplacer\DocumentReplacer;
 use Enflow\DocumentReplacer\Template;
 use PHPUnit\Framework\TestCase;