diff --git a/.gitattributes b/.gitattributes
index a9c1856..ec99f8c 100644
--- a/.gitattributes
+++ b/.gitattributes
@@ -3,8 +3,8 @@
 /.gitignore export-ignore
 /.php-cs-fixer.php export-ignore
 /.github export-ignore
-/README.md export-ignore
-/phpunit.xml export-ignore
-/phpstan.neon export-ignore
+/example export-ignore
 /tests export-ignore
-/example export-ignore
\ No newline at end of file
+/phpstan.neon export-ignore
+/phpunit.xml export-ignore
+/README.md export-ignore
\ No newline at end of file
diff --git a/.github/workflows/main.yaml b/.github/workflows/main.yaml
index 2d0fe09..e429fb3 100644
--- a/.github/workflows/main.yaml
+++ b/.github/workflows/main.yaml
@@ -6,13 +6,13 @@ on:
 
 jobs:
   tests:
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-22.04
     strategy:
       matrix:
-        php: ['7.1', '7.2', '7.3', '7.4', '8.0', '8.1']
+        php: ['7.1', '7.2', '7.3', '7.4', '8.0', '8.1', '8.2']
     name: PHP ${{ matrix.php }}
     steps:
-      -   uses: actions/checkout@v2
+      -   uses: actions/checkout@v3
       # required for "git tag" presence for MonorepoBuilder split and ChangelogLinker git tags resolver; default is 1
       -   run: git fetch --depth=100000 origin
       # see https://github.com/shivammathur/setup-php
@@ -26,14 +26,14 @@ jobs:
 
   tests_lowest_dependencies:
     name: Lowest dependencies
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-22.04
     steps:
-      -   uses: actions/checkout@v2
+      -   uses: actions/checkout@v3
       -   run: git fetch --depth=100000 origin
       # see https://github.com/shivammathur/setup-php
       -   uses: shivammathur/setup-php@v2
           with:
-            php-version: 7.1
+            php-version: '7.1'
             extensions: xml
             coverage: none
       -   run: composer update --no-progress --prefer-lowest
@@ -41,14 +41,14 @@ jobs:
 
   test_coverage:
     name: Coverage
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-22.04
     steps:
-      -   uses: actions/checkout@v2
+      -   uses: actions/checkout@v3
       -   run: git fetch --depth=100000 origin
       # see https://github.com/shivammathur/setup-php
       -   uses: shivammathur/setup-php@v2
           with:
-            php-version: 7.1
+            php-version: '7.1'
             extensions: xml, xdebug
             coverage: xdebug
       -   run: composer install --no-progress
@@ -59,13 +59,13 @@ jobs:
 
   php-cs-fixer:
     name: PHP CS Fixer
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-22.04
     steps:
-      -   uses: actions/checkout@v2
+      -   uses: actions/checkout@v3
       # see https://github.com/shivammathur/setup-php
       -   uses: shivammathur/setup-php@v2
           with:
-            php-version: 7.4
+            php-version: '8.2'
             extensions: xml
             coverage: none
       -   run: composer install --no-progress
@@ -73,12 +73,12 @@ jobs:
 
   phpstan:
     name: PHPStan
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-22.04
     steps:
-      -   uses: actions/checkout@v2
+      -   uses: actions/checkout@v3
       -   uses: shivammathur/setup-php@v2
           with:
-            php-version: 8.1
+            php-version: '8.2'
             coverage: none
       -   run: composer install --no-progress
       -   run: composer phpstan
\ No newline at end of file
diff --git a/.gitignore b/.gitignore
index 3bca77e..be929f3 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,4 +1,5 @@
 /vendor/
+/.idea/
 /.*.cache
 /tests-report-html/
 /composer.lock
diff --git a/.php-cs-fixer.php b/.php-cs-fixer.php
index cd1256f..750f3ae 100644
--- a/.php-cs-fixer.php
+++ b/.php-cs-fixer.php
@@ -11,10 +11,23 @@
     '@PSR12:risky' => true,
     '@PhpCsFixer' => true,
     '@PhpCsFixer:risky' => true,
+    '@PHP71Migration' => true,
+    '@PHP71Migration:risky' => true,
     'array_syntax' => ['syntax' => 'short'],
     'php_unit_test_class_requires_covers' => false,
-    'php_unit_test_case_static_method_calls' => ['call_type' => 'self'],
+    'backtick_to_shell_exec' => true,
+    'blank_line_before_statement' => [
+        'statements' => ['declare', 'return', 'case'],
+    ],
+    'comment_to_phpdoc' => false,
+    'declare_equal_normalize' => ['space' => 'single'],
+    'global_namespace_import' => true,
+    'linebreak_after_opening_tag' => true,
     'native_function_invocation' => false,
+    'no_unset_on_property' => false,
+    'php_unit_test_case_static_method_calls' => ['call_type' => 'self'],
+    'phpdoc_to_comment' => false,
+    'self_static_accessor' => true,
 ])
     ->setFinder($finder)
     ;
\ No newline at end of file
diff --git a/README.md b/README.md
index 6562946..5cd8b93 100644
--- a/README.md
+++ b/README.md
@@ -1,4 +1,4 @@
-![CI](https://img.shields.io/github/workflow/status/ddebin/atom-generator/CI?style=for-the-badge)
+![CI](https://img.shields.io/github/actions/workflow/status/ddebin/atom-generator/main.yaml?style=for-the-badge)
 [![Codecov](https://img.shields.io/codecov/c/github/ddebin/atom-generator?logo=codecov&style=for-the-badge)](https://codecov.io/gh/ddebin/atom-generator)
 ![PHP from Packagist](https://img.shields.io/packagist/php-v/ddebin/atom-generator?logo=php&style=for-the-badge)
 [![Packagist Version](https://img.shields.io/packagist/v/ddebin/atom-generator?style=for-the-badge)](https://packagist.org/packages/ddebin/atom-generator)
diff --git a/composer.json b/composer.json
index fdb36f9..e39ee9c 100644
--- a/composer.json
+++ b/composer.json
@@ -45,11 +45,11 @@
     }
   },
   "scripts": {
-    "coverage": "phpunit --coverage-clover=clover.xml",
-    "php-cs-fixer": "php-cs-fixer fix --allow-risky=yes",
-    "php-cs-fixer-dry-run": "php-cs-fixer fix --dry-run --allow-risky=yes",
-    "phpstan": "phpstan analyse -l max -c phpstan.neon src tests",
-    "phpunit": "phpunit",
+    "coverage": "@php phpunit --coverage-clover=clover.xml",
+    "php-cs-fixer": "@php php-cs-fixer fix --allow-risky=yes",
+    "php-cs-fixer-dry-run": "@php php-cs-fixer fix --dry-run --allow-risky=yes",
+    "phpstan": "@php phpstan analyse -l max -c phpstan.neon src tests example .php-cs-fixer.php",
+    "phpunit": "@php phpunit",
     "test": [
       "@php-cs-fixer-dry-run",
       "@phpstan",
diff --git a/example/feed.php b/example/feed.php
index 55b634b..35190ee 100644
--- a/example/feed.php
+++ b/example/feed.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types = 1);
+
 include_once 'vendor/autoload.php';
 
 $entry = new AtomGenerator\Entry();
diff --git a/src/AbstractElement.php b/src/AbstractElement.php
index b11838c..31ddbd2 100644
--- a/src/AbstractElement.php
+++ b/src/AbstractElement.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types = 1);
+
 namespace AtomGenerator;
 
 use DateTime;
diff --git a/src/Entry.php b/src/Entry.php
index b5df9e2..9ef23d0 100644
--- a/src/Entry.php
+++ b/src/Entry.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types = 1);
+
 namespace AtomGenerator;
 
 use DateTimeInterface;
diff --git a/src/Feed.php b/src/Feed.php
index 6b24954..1f1f209 100644
--- a/src/Feed.php
+++ b/src/Feed.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types = 1);
+
 namespace AtomGenerator;
 
 use DOMDocument;
@@ -228,7 +230,7 @@ public function saveXML()
      *
      * @see https://cweiske.de/tagebuch/atom-validation.htm
      *
-     * @param null|libXMLError[] $errors
+     * @param null|LibXMLError[] $errors
      */
     public static function validate(DOMDocument $document, ?array &$errors = null): bool
     {
diff --git a/tests/FeedTest.php b/tests/FeedTest.php
index fc7586a..080173d 100644
--- a/tests/FeedTest.php
+++ b/tests/FeedTest.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types = 1);
+
 namespace Tests;
 
 use AtomGenerator\Entry;
@@ -234,7 +236,7 @@ public function testFeedCreationException4(): void
     }
 
     /**
-     * @param libXMLError[] $errors
+     * @param LibXMLError[] $errors
      *
      * @codeCoverageIgnore
      */