diff --git a/.github/workflows/php81.yml b/.github/workflows/php81.yml
new file mode 100644
index 0000000..535bd59
--- /dev/null
+++ b/.github/workflows/php81.yml
@@ -0,0 +1,34 @@
+name: PHP 8.1
+
+on:
+  push:
+    branches: [main]
+  pull_request:
+    branches: [main]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+
+      - name: Setup PHP Action
+        uses: shivammathur/setup-php@2.15.0
+        with:
+          php-version: '8.1'
+
+      - name: Validate composer.json and composer.lock
+        run: composer validate
+
+      - name: Install dependencies
+        run: composer install --prefer-dist --no-progress
+
+      - name: Run style check
+        run: composer run style
+
+      - name: Run static analyzer
+        run: composer run stan
+
+      - name: Run tests
+        run: composer run test
diff --git a/composer.json b/composer.json
index e754999..5ec7ecf 100644
--- a/composer.json
+++ b/composer.json
@@ -11,10 +11,10 @@
   ],
   "require": {
     "php": "^8.0",
-    "8fold/php-xml-builder": "^1.0.0"
+    "8fold/php-xml-builder": "^1.0"
   },
   "require-dev": {
-    "phpstan/phpstan": "^1.2.0",
+    "phpstan/phpstan": "^1.2",
     "phpunit/phpunit": "^9.5",
     "squizlabs/php_codesniffer": "^3.6"
   },
diff --git a/composer.lock b/composer.lock
index 16506c1..2a05e17 100644
--- a/composer.lock
+++ b/composer.lock
@@ -4,29 +4,29 @@
         "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#installing-dependencies",
         "This file is @generated automatically"
     ],
-    "content-hash": "78464f6d90e9cfa1cd31309d1ad7e81e",
+    "content-hash": "199aa517e28afc812147d2db276ef5b7",
     "packages": [
         {
             "name": "8fold/php-xml-builder",
-            "version": "1.0.0",
+            "version": "1.4.0",
             "source": {
                 "type": "git",
                 "url": "https://github.com/8fold/php-xml-builder.git",
-                "reference": "2cd94216bf97037670ff1509188f0c5852923a4c"
+                "reference": "69800b791a2b331f603a1680a33f8a082a44309f"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/8fold/php-xml-builder/zipball/2cd94216bf97037670ff1509188f0c5852923a4c",
-                "reference": "2cd94216bf97037670ff1509188f0c5852923a4c",
+                "url": "https://api.github.com/repos/8fold/php-xml-builder/zipball/69800b791a2b331f603a1680a33f8a082a44309f",
+                "reference": "69800b791a2b331f603a1680a33f8a082a44309f",
                 "shasum": ""
             },
             "require": {
                 "php": "^8.0"
             },
             "require-dev": {
-                "phpstan/phpstan": "^1.2.0",
+                "phpstan/phpstan": "^1.9",
                 "phpunit/phpunit": "^9.5",
-                "squizlabs/php_codesniffer": "^3.6"
+                "squizlabs/php_codesniffer": "^3.7"
             },
             "type": "library",
             "autoload": {
@@ -47,7 +47,7 @@
             "description": "A library for building XML document and element strings.",
             "support": {
                 "issues": "https://github.com/8fold/php-xml-builder/issues",
-                "source": "https://github.com/8fold/php-xml-builder/tree/1.0.0"
+                "source": "https://github.com/8fold/php-xml-builder/tree/1.4.0"
             },
             "funding": [
                 {
@@ -59,35 +59,36 @@
                     "type": "github"
                 }
             ],
-            "time": "2022-01-31T01:49:18+00:00"
+            "time": "2022-12-05T00:11:28+00:00"
         }
     ],
     "packages-dev": [
         {
             "name": "doctrine/instantiator",
-            "version": "1.4.0",
+            "version": "1.4.1",
             "source": {
                 "type": "git",
                 "url": "https://github.com/doctrine/instantiator.git",
-                "reference": "d56bf6102915de5702778fe20f2de3b2fe570b5b"
+                "reference": "10dcfce151b967d20fde1b34ae6640712c3891bc"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/doctrine/instantiator/zipball/d56bf6102915de5702778fe20f2de3b2fe570b5b",
-                "reference": "d56bf6102915de5702778fe20f2de3b2fe570b5b",
+                "url": "https://api.github.com/repos/doctrine/instantiator/zipball/10dcfce151b967d20fde1b34ae6640712c3891bc",
+                "reference": "10dcfce151b967d20fde1b34ae6640712c3891bc",
                 "shasum": ""
             },
             "require": {
                 "php": "^7.1 || ^8.0"
             },
             "require-dev": {
-                "doctrine/coding-standard": "^8.0",
+                "doctrine/coding-standard": "^9",
                 "ext-pdo": "*",
                 "ext-phar": "*",
-                "phpbench/phpbench": "^0.13 || 1.0.0-alpha2",
-                "phpstan/phpstan": "^0.12",
-                "phpstan/phpstan-phpunit": "^0.12",
-                "phpunit/phpunit": "^7.0 || ^8.0 || ^9.0"
+                "phpbench/phpbench": "^0.16 || ^1",
+                "phpstan/phpstan": "^1.4",
+                "phpstan/phpstan-phpunit": "^1",
+                "phpunit/phpunit": "^7.5 || ^8.5 || ^9.5",
+                "vimeo/psalm": "^4.22"
             },
             "type": "library",
             "autoload": {
@@ -114,7 +115,7 @@
             ],
             "support": {
                 "issues": "https://github.com/doctrine/instantiator/issues",
-                "source": "https://github.com/doctrine/instantiator/tree/1.4.0"
+                "source": "https://github.com/doctrine/instantiator/tree/1.4.1"
             },
             "funding": [
                 {
@@ -130,38 +131,42 @@
                     "type": "tidelift"
                 }
             ],
-            "time": "2020-11-10T18:47:58+00:00"
+            "time": "2022-03-03T08:28:38+00:00"
         },
         {
             "name": "myclabs/deep-copy",
-            "version": "1.10.2",
+            "version": "1.11.0",
             "source": {
                 "type": "git",
                 "url": "https://github.com/myclabs/DeepCopy.git",
-                "reference": "776f831124e9c62e1a2c601ecc52e776d8bb7220"
+                "reference": "14daed4296fae74d9e3201d2c4925d1acb7aa614"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/myclabs/DeepCopy/zipball/776f831124e9c62e1a2c601ecc52e776d8bb7220",
-                "reference": "776f831124e9c62e1a2c601ecc52e776d8bb7220",
+                "url": "https://api.github.com/repos/myclabs/DeepCopy/zipball/14daed4296fae74d9e3201d2c4925d1acb7aa614",
+                "reference": "14daed4296fae74d9e3201d2c4925d1acb7aa614",
                 "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": "^1.0",
-                "doctrine/common": "^2.6",
-                "phpunit/phpunit": "^7.1"
+                "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": {
-                "psr-4": {
-                    "DeepCopy\\": "src/DeepCopy/"
-                },
                 "files": [
                     "src/DeepCopy/deep_copy.php"
-                ]
+                ],
+                "psr-4": {
+                    "DeepCopy\\": "src/DeepCopy/"
+                }
             },
             "notification-url": "https://packagist.org/downloads/",
             "license": [
@@ -177,7 +182,7 @@
             ],
             "support": {
                 "issues": "https://github.com/myclabs/DeepCopy/issues",
-                "source": "https://github.com/myclabs/DeepCopy/tree/1.10.2"
+                "source": "https://github.com/myclabs/DeepCopy/tree/1.11.0"
             },
             "funding": [
                 {
@@ -185,20 +190,20 @@
                     "type": "tidelift"
                 }
             ],
-            "time": "2020-11-13T09:40:50+00:00"
+            "time": "2022-03-03T13:19:32+00:00"
         },
         {
             "name": "nikic/php-parser",
-            "version": "v4.13.2",
+            "version": "v4.15.2",
             "source": {
                 "type": "git",
                 "url": "https://github.com/nikic/PHP-Parser.git",
-                "reference": "210577fe3cf7badcc5814d99455df46564f3c077"
+                "reference": "f59bbe44bf7d96f24f3e2b4ddc21cd52c1d2adbc"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/nikic/PHP-Parser/zipball/210577fe3cf7badcc5814d99455df46564f3c077",
-                "reference": "210577fe3cf7badcc5814d99455df46564f3c077",
+                "url": "https://api.github.com/repos/nikic/PHP-Parser/zipball/f59bbe44bf7d96f24f3e2b4ddc21cd52c1d2adbc",
+                "reference": "f59bbe44bf7d96f24f3e2b4ddc21cd52c1d2adbc",
                 "shasum": ""
             },
             "require": {
@@ -239,9 +244,9 @@
             ],
             "support": {
                 "issues": "https://github.com/nikic/PHP-Parser/issues",
-                "source": "https://github.com/nikic/PHP-Parser/tree/v4.13.2"
+                "source": "https://github.com/nikic/PHP-Parser/tree/v4.15.2"
             },
-            "time": "2021-11-30T19:35:32+00:00"
+            "time": "2022-11-12T15:38:23+00:00"
         },
         {
             "name": "phar-io/manifest",
@@ -305,16 +310,16 @@
         },
         {
             "name": "phar-io/version",
-            "version": "3.1.0",
+            "version": "3.2.1",
             "source": {
                 "type": "git",
                 "url": "https://github.com/phar-io/version.git",
-                "reference": "bae7c545bef187884426f042434e561ab1ddb182"
+                "reference": "4f7fd7836c6f332bb2933569e566a0d6c4cbed74"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/phar-io/version/zipball/bae7c545bef187884426f042434e561ab1ddb182",
-                "reference": "bae7c545bef187884426f042434e561ab1ddb182",
+                "url": "https://api.github.com/repos/phar-io/version/zipball/4f7fd7836c6f332bb2933569e566a0d6c4cbed74",
+                "reference": "4f7fd7836c6f332bb2933569e566a0d6c4cbed74",
                 "shasum": ""
             },
             "require": {
@@ -350,253 +355,26 @@
             "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/3.1.0"
-            },
-            "time": "2021-02-23T14:00:09+00:00"
-        },
-        {
-            "name": "phpdocumentor/reflection-common",
-            "version": "2.2.0",
-            "source": {
-                "type": "git",
-                "url": "https://github.com/phpDocumentor/ReflectionCommon.git",
-                "reference": "1d01c49d4ed62f25aa84a747ad35d5a16924662b"
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-                "reference": "1d01c49d4ed62f25aa84a747ad35d5a16924662b",
-                "shasum": ""
-            },
-            "require": {
-                "php": "^7.2 || ^8.0"
-            },
-            "type": "library",
-            "extra": {
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-            "license": [
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-            "description": "Highly opinionated mocking framework for PHP 5.3+",
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-            "support": {
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-                "source": "https://github.com/phpspec/prophecy/tree/v1.15.0"
+                "source": "https://github.com/phar-io/version/tree/3.2.1"
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-            "time": "2021-12-08T12:19:24+00:00"
+            "time": "2022-02-21T01:04:05+00:00"
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-            "version": "1.4.4",
+            "version": "1.9.2",
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-                "php": "^7.1|^8.0"
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@@ -606,11 +384,6 @@
                 "phpstan.phar"
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             "autoload": {
                 "files": [
                     "bootstrap.php"
@@ -621,9 +394,13 @@
                 "MIT"
             ],
             "description": "PHPStan - PHP Static Analysis Tool",
+            "keywords": [
+                "dev",
+                "static analysis"
+            ],
             "support": {
                 "issues": "https://github.com/phpstan/phpstan/issues",
-                "source": "https://github.com/phpstan/phpstan/tree/1.4.4"
+                "source": "https://github.com/phpstan/phpstan/tree/1.9.2"
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@@ -634,36 +411,32 @@
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                     "type": "tidelift"
                 }
             ],
-            "time": "2022-01-31T16:50:49+00:00"
+            "time": "2022-11-10T09:56:11+00:00"
         },
         {
             "name": "phpunit/php-code-coverage",
-            "version": "9.2.10",
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