diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index dfefd2d..381d29b 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -85,6 +85,7 @@ jobs:
           - '7.3'
           - '7.4'
           - '8.0'
+          - '8.1'
 
     steps:
       - name: "Checkout code"
diff --git a/.github/workflows/heartbeat.yml b/.github/workflows/heartbeat.yml
index 680161e..8485c6b 100644
--- a/.github/workflows/heartbeat.yml
+++ b/.github/workflows/heartbeat.yml
@@ -2,17 +2,17 @@ name: Packagist heartbeat
 
 on:
   schedule:
-    - cron:  '1/16 3-9 * * *'
+    - cron:  '1/16 4-10 * * *'
   workflow_dispatch:
 
 jobs:
-   package-test:
+  package-test2:
     name: "Composer package install test"
     runs-on: "ubuntu-latest"
     strategy:
       matrix:
         php-version:
-          - '8.0'
+          - '8.1'
     steps:
       - name: Install dependencies
-        run: composer require ouxsoft/phpmarkup
\ No newline at end of file
+        run: echo "{}" >> composer.json && composer require ouxsoft/phpmarkup
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 1b2c197..4e71b19 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -11,6 +11,10 @@ All releases must adhere to [SemVer 2](https://semver.org/) naming convention an
 ## PHPMarkup [Unreleased]
 Released: TBA. Notable changes:
 
+## PHPMarkup 4.3.0
+Released: 2022-01-01. Notable changes:
+* Changed: Add PHP 8.1 support.
+
 ## PHPMarkup 4.2.6
 Released: 2021-10-08. Notable changes:
 * Changed: Marker attribute removal to end routine.
diff --git a/README.md b/README.md
index 039f8d3..211a306 100644
--- a/README.md
+++ b/README.md
@@ -6,7 +6,7 @@
 [![Docs Status](https://readthedocs.org/projects/phpmarkup/badge/?version=latest&style=flat)](https://readthedocs.org/projects/phpmarkup)
 
 [![Latest Stable Version](https://img.shields.io/packagist/v/Ouxsoft/phpmarkup.svg)](https://packagist.org/packages/Ouxsoft/phpmarkup)
-[![PHP Versions Supported](https://img.shields.io/badge/php-7.3%20to%208.0-777bb3.svg?logo=php&logoColor=white&labelColor=555555)](https://api.travis-ci.com/Ouxsoft/phpmarkup.svg?branch=master&status=passed)
+[![PHP Versions Supported](https://img.shields.io/badge/php-7.3%20to%208.1-777bb3.svg?logo=php&logoColor=white&labelColor=555555)](https://api.travis-ci.com/Ouxsoft/phpmarkup.svg?branch=master&status=passed)
 [![License](https://img.shields.io/badge/license-MIT-428f7e.svg?logo=open%20source%20initiative&logoColor=white&labelColor=555555)](https://github.com/Ouxsoft/phpmarkup/blob/master/LICENSE)
 [![Total Downloads](https://img.shields.io/packagist/dt/Ouxsoft/phpmarkup.svg)](https://packagist.org/packages/Ouxsoft/phpmarkup)
 
diff --git a/composer.json b/composer.json
index a3c9cf6..1cfded8 100644
--- a/composer.json
+++ b/composer.json
@@ -17,7 +17,7 @@
     "issues": "https://github.com/Ouxsoft/phpmarkup/issues"
   },
   "require": {
-    "php": "^7.3 || ~8.0.0",
+    "php": "^7.3 || ^8.0",
     "ext-dom": "*",
     "ext-json": "*",
     "ext-libxml": "*",
diff --git a/composer.lock b/composer.lock
index f256652..5bd5bbf 100644
--- a/composer.lock
+++ b/composer.lock
@@ -4,7 +4,7 @@
         "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#installing-dependencies",
         "This file is @generated automatically"
     ],
-    "content-hash": "e485656e0b7598851df7afd05a6dfcb7",
+    "content-hash": "4dc5441d3ffa9b1597e208ca6b98edad",
     "packages": [
         {
             "name": "container-interop/container-interop",
@@ -112,16 +112,16 @@
         },
         {
             "name": "laminas/laminas-stdlib",
-            "version": "3.6.0",
+            "version": "3.6.4",
             "source": {
                 "type": "git",
                 "url": "https://github.com/laminas/laminas-stdlib.git",
-                "reference": "c53d8537f108fac3fae652677a19735db730ba46"
+                "reference": "830a36d93aeaf06e540e90ec031babb3c6eafadb"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/laminas/laminas-stdlib/zipball/c53d8537f108fac3fae652677a19735db730ba46",
-                "reference": "c53d8537f108fac3fae652677a19735db730ba46",
+                "url": "https://api.github.com/repos/laminas/laminas-stdlib/zipball/830a36d93aeaf06e540e90ec031babb3c6eafadb",
+                "reference": "830a36d93aeaf06e540e90ec031babb3c6eafadb",
                 "shasum": ""
             },
             "require": {
@@ -167,20 +167,20 @@
                     "type": "community_bridge"
                 }
             ],
-            "time": "2021-09-02T16:11:32+00:00"
+            "time": "2021-12-29T14:33:01+00:00"
         },
         {
             "name": "laminas/laminas-validator",
-            "version": "2.15.0",
+            "version": "2.15.1",
             "source": {
                 "type": "git",
                 "url": "https://github.com/laminas/laminas-validator.git",
-                "reference": "270380e87904f5a1a1fba3059989d4ca157e16a9"
+                "reference": "fbd87f30c0a27aaeeee8adb2f934c14fb6046c80"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/laminas/laminas-validator/zipball/270380e87904f5a1a1fba3059989d4ca157e16a9",
-                "reference": "270380e87904f5a1a1fba3059989d4ca157e16a9",
+                "url": "https://api.github.com/repos/laminas/laminas-validator/zipball/fbd87f30c0a27aaeeee8adb2f934c14fb6046c80",
+                "reference": "fbd87f30c0a27aaeeee8adb2f934c14fb6046c80",
                 "shasum": ""
             },
             "require": {
@@ -257,28 +257,28 @@
                     "type": "community_bridge"
                 }
             ],
-            "time": "2021-09-08T23:16:56+00:00"
+            "time": "2021-12-02T14:23:06+00:00"
         },
         {
             "name": "pimple/pimple",
-            "version": "v3.4.0",
+            "version": "v3.5.0",
             "source": {
                 "type": "git",
                 "url": "https://github.com/silexphp/Pimple.git",
-                "reference": "86406047271859ffc13424a048541f4531f53601"
+                "reference": "a94b3a4db7fb774b3d78dad2315ddc07629e1bed"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/silexphp/Pimple/zipball/86406047271859ffc13424a048541f4531f53601",
-                "reference": "86406047271859ffc13424a048541f4531f53601",
+                "url": "https://api.github.com/repos/silexphp/Pimple/zipball/a94b3a4db7fb774b3d78dad2315ddc07629e1bed",
+                "reference": "a94b3a4db7fb774b3d78dad2315ddc07629e1bed",
                 "shasum": ""
             },
             "require": {
                 "php": ">=7.2.5",
-                "psr/container": "^1.1"
+                "psr/container": "^1.1 || ^2.0"
             },
             "require-dev": {
-                "symfony/phpunit-bridge": "^5.0"
+                "symfony/phpunit-bridge": "^5.4@dev"
             },
             "type": "library",
             "extra": {
@@ -308,26 +308,26 @@
                 "dependency injection"
             ],
             "support": {
-                "source": "https://github.com/silexphp/Pimple/tree/v3.4.0"
+                "source": "https://github.com/silexphp/Pimple/tree/v3.5.0"
             },
-            "time": "2021-03-06T08:28:00+00:00"
+            "time": "2021-10-28T11:13:42+00:00"
         },
         {
             "name": "psr/container",
-            "version": "1.1.1",
+            "version": "1.1.2",
             "source": {
                 "type": "git",
                 "url": "https://github.com/php-fig/container.git",
-                "reference": "8622567409010282b7aeebe4bb841fe98b58dcaf"
+                "reference": "513e0666f7216c7459170d56df27dfcefe1689ea"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/php-fig/container/zipball/8622567409010282b7aeebe4bb841fe98b58dcaf",
-                "reference": "8622567409010282b7aeebe4bb841fe98b58dcaf",
+                "url": "https://api.github.com/repos/php-fig/container/zipball/513e0666f7216c7459170d56df27dfcefe1689ea",
+                "reference": "513e0666f7216c7459170d56df27dfcefe1689ea",
                 "shasum": ""
             },
             "require": {
-                "php": ">=7.2.0"
+                "php": ">=7.4.0"
             },
             "type": "library",
             "autoload": {
@@ -356,24 +356,95 @@
             ],
             "support": {
                 "issues": "https://github.com/php-fig/container/issues",
-                "source": "https://github.com/php-fig/container/tree/1.1.1"
+                "source": "https://github.com/php-fig/container/tree/1.1.2"
             },
-            "time": "2021-03-05T17:36:06+00:00"
+            "time": "2021-11-05T16:50:12+00:00"
         }
     ],
     "packages-dev": [
+        {
+            "name": "composer/pcre",
+            "version": "1.0.0",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/composer/pcre.git",
+                "reference": "3d322d715c43a1ac36c7fe215fa59336265500f2"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/composer/pcre/zipball/3d322d715c43a1ac36c7fe215fa59336265500f2",
+                "reference": "3d322d715c43a1ac36c7fe215fa59336265500f2",
+                "shasum": ""
+            },
+            "require": {
+                "php": "^5.3.2 || ^7.0 || ^8.0"
+            },
+            "require-dev": {
+                "phpstan/phpstan": "^1",
+                "phpstan/phpstan-strict-rules": "^1.1",
+                "symfony/phpunit-bridge": "^4.2 || ^5"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-main": "1.x-dev"
+                }
+            },
+            "autoload": {
+                "psr-4": {
+                    "Composer\\Pcre\\": "src"
+                }
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "authors": [
+                {
+                    "name": "Jordi Boggiano",
+                    "email": "j.boggiano@seld.be",
+                    "homepage": "http://seld.be"
+                }
+            ],
+            "description": "PCRE wrapping library that offers type-safe preg_* replacements.",
+            "keywords": [
+                "PCRE",
+                "preg",
+                "regex",
+                "regular expression"
+            ],
+            "support": {
+                "issues": "https://github.com/composer/pcre/issues",
+                "source": "https://github.com/composer/pcre/tree/1.0.0"
+            },
+            "funding": [
+                {
+                    "url": "https://packagist.com",
+                    "type": "custom"
+                },
+                {
+                    "url": "https://github.com/composer",
+                    "type": "github"
+                },
+                {
+                    "url": "https://tidelift.com/funding/github/packagist/composer/composer",
+                    "type": "tidelift"
+                }
+            ],
+            "time": "2021-12-06T15:17:27+00:00"
+        },
         {
             "name": "composer/semver",
-            "version": "3.2.5",
+            "version": "3.2.6",
             "source": {
                 "type": "git",
                 "url": "https://github.com/composer/semver.git",
-                "reference": "31f3ea725711245195f62e54ffa402d8ef2fdba9"
+                "reference": "83e511e247de329283478496f7a1e114c9517506"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/composer/semver/zipball/31f3ea725711245195f62e54ffa402d8ef2fdba9",
-                "reference": "31f3ea725711245195f62e54ffa402d8ef2fdba9",
+                "url": "https://api.github.com/repos/composer/semver/zipball/83e511e247de329283478496f7a1e114c9517506",
+                "reference": "83e511e247de329283478496f7a1e114c9517506",
                 "shasum": ""
             },
             "require": {
@@ -425,7 +496,7 @@
             "support": {
                 "irc": "irc://irc.freenode.org/composer",
                 "issues": "https://github.com/composer/semver/issues",
-                "source": "https://github.com/composer/semver/tree/3.2.5"
+                "source": "https://github.com/composer/semver/tree/3.2.6"
             },
             "funding": [
                 {
@@ -441,29 +512,31 @@
                     "type": "tidelift"
                 }
             ],
-            "time": "2021-05-24T12:41:47+00:00"
+            "time": "2021-10-25T11:34:17+00:00"
         },
         {
             "name": "composer/xdebug-handler",
-            "version": "2.0.2",
+            "version": "2.0.3",
             "source": {
                 "type": "git",
                 "url": "https://github.com/composer/xdebug-handler.git",
-                "reference": "84674dd3a7575ba617f5a76d7e9e29a7d3891339"
+                "reference": "6555461e76962fd0379c444c46fd558a0fcfb65e"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/composer/xdebug-handler/zipball/84674dd3a7575ba617f5a76d7e9e29a7d3891339",
-                "reference": "84674dd3a7575ba617f5a76d7e9e29a7d3891339",
+                "url": "https://api.github.com/repos/composer/xdebug-handler/zipball/6555461e76962fd0379c444c46fd558a0fcfb65e",
+                "reference": "6555461e76962fd0379c444c46fd558a0fcfb65e",
                 "shasum": ""
             },
             "require": {
+                "composer/pcre": "^1",
                 "php": "^5.3.2 || ^7.0 || ^8.0",
                 "psr/log": "^1 || ^2 || ^3"
             },
             "require-dev": {
-                "phpstan/phpstan": "^0.12.55",
-                "symfony/phpunit-bridge": "^4.2 || ^5"
+                "phpstan/phpstan": "^1.0",
+                "phpstan/phpstan-strict-rules": "^1.1",
+                "symfony/phpunit-bridge": "^4.2 || ^5.0 || ^6.0"
             },
             "type": "library",
             "autoload": {
@@ -489,7 +562,7 @@
             "support": {
                 "irc": "irc://irc.freenode.org/composer",
                 "issues": "https://github.com/composer/xdebug-handler/issues",
-                "source": "https://github.com/composer/xdebug-handler/tree/2.0.2"
+                "source": "https://github.com/composer/xdebug-handler/tree/2.0.3"
             },
             "funding": [
                 {
@@ -505,7 +578,7 @@
                     "type": "tidelift"
                 }
             ],
-            "time": "2021-07-31T17:03:58+00:00"
+            "time": "2021-12-08T13:07:32+00:00"
         },
         {
             "name": "doctrine/annotations",
@@ -730,16 +803,16 @@
         },
         {
             "name": "friendsofphp/php-cs-fixer",
-            "version": "v3.2.1",
+            "version": "v3.4.0",
             "source": {
                 "type": "git",
                 "url": "https://github.com/FriendsOfPHP/PHP-CS-Fixer.git",
-                "reference": "13ae36a76b6e329e44ca3cafaa784ea02db9ff14"
+                "reference": "47177af1cfb9dab5d1cc4daf91b7179c2efe7fad"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/FriendsOfPHP/PHP-CS-Fixer/zipball/13ae36a76b6e329e44ca3cafaa784ea02db9ff14",
-                "reference": "13ae36a76b6e329e44ca3cafaa784ea02db9ff14",
+                "url": "https://api.github.com/repos/FriendsOfPHP/PHP-CS-Fixer/zipball/47177af1cfb9dab5d1cc4daf91b7179c2efe7fad",
+                "reference": "47177af1cfb9dab5d1cc4daf91b7179c2efe7fad",
                 "shasum": ""
             },
             "require": {
@@ -748,39 +821,38 @@
                 "doctrine/annotations": "^1.12",
                 "ext-json": "*",
                 "ext-tokenizer": "*",
-                "php": "^7.2 || ^8.0",
+                "php": "^7.2.5 || ^8.0",
                 "php-cs-fixer/diff": "^2.0",
-                "symfony/console": "^4.4.20 || ^5.1.3",
-                "symfony/event-dispatcher": "^4.4.20 || ^5.0",
-                "symfony/filesystem": "^4.4.20 || ^5.0",
-                "symfony/finder": "^4.4.20 || ^5.0",
-                "symfony/options-resolver": "^4.4.20 || ^5.0",
-                "symfony/polyfill-php72": "^1.23",
+                "symfony/console": "^4.4.20 || ^5.1.3 || ^6.0",
+                "symfony/event-dispatcher": "^4.4.20 || ^5.0 || ^6.0",
+                "symfony/filesystem": "^4.4.20 || ^5.0 || ^6.0",
+                "symfony/finder": "^4.4.20 || ^5.0 || ^6.0",
+                "symfony/options-resolver": "^4.4.20 || ^5.0 || ^6.0",
+                "symfony/polyfill-mbstring": "^1.23",
                 "symfony/polyfill-php80": "^1.23",
                 "symfony/polyfill-php81": "^1.23",
-                "symfony/process": "^4.4.20 || ^5.0",
-                "symfony/stopwatch": "^4.4.20 || ^5.0"
+                "symfony/process": "^4.4.20 || ^5.0 || ^6.0",
+                "symfony/stopwatch": "^4.4.20 || ^5.0 || ^6.0"
             },
             "require-dev": {
                 "justinrainbow/json-schema": "^5.2",
                 "keradus/cli-executor": "^1.5",
                 "mikey179/vfsstream": "^1.6.8",
-                "php-coveralls/php-coveralls": "^2.4.3",
+                "php-coveralls/php-coveralls": "^2.5.2",
                 "php-cs-fixer/accessible-object": "^1.1",
                 "php-cs-fixer/phpunit-constraint-isidenticalstring": "^1.2",
                 "php-cs-fixer/phpunit-constraint-xmlmatchesxsd": "^1.2.1",
-                "phpspec/prophecy": "^1.10.3",
+                "phpspec/prophecy": "^1.15",
                 "phpspec/prophecy-phpunit": "^1.1 || ^2.0",
-                "phpunit/phpunit": "^7.5.20 || ^8.5.14 || ^9.5",
+                "phpunit/phpunit": "^8.5.21 || ^9.5",
                 "phpunitgoodpractices/polyfill": "^1.5",
                 "phpunitgoodpractices/traits": "^1.9.1",
-                "symfony/phpunit-bridge": "^5.2.4",
-                "symfony/yaml": "^4.4.20 || ^5.0"
+                "symfony/phpunit-bridge": "^5.2.4 || ^6.0",
+                "symfony/yaml": "^4.4.20 || ^5.0 || ^6.0"
             },
             "suggest": {
                 "ext-dom": "For handling output formats in XML",
-                "ext-mbstring": "For handling non-UTF8 characters.",
-                "symfony/polyfill-mbstring": "When enabling `ext-mbstring` is not possible."
+                "ext-mbstring": "For handling non-UTF8 characters."
             },
             "bin": [
                 "php-cs-fixer"
@@ -808,7 +880,7 @@
             "description": "A tool to automatically fix PHP code style",
             "support": {
                 "issues": "https://github.com/FriendsOfPHP/PHP-CS-Fixer/issues",
-                "source": "https://github.com/FriendsOfPHP/PHP-CS-Fixer/tree/v3.2.1"
+                "source": "https://github.com/FriendsOfPHP/PHP-CS-Fixer/tree/v3.4.0"
             },
             "funding": [
                 {
@@ -816,7 +888,7 @@
                     "type": "github"
                 }
             ],
-            "time": "2021-10-05T08:12:17+00:00"
+            "time": "2021-12-11T16:25:08+00:00"
         },
         {
             "name": "myclabs/deep-copy",
@@ -835,9 +907,6 @@
             "require": {
                 "php": "^7.1 || ^8.0"
             },
-            "replace": {
-                "myclabs/deep-copy": "self.version"
-            },
             "require-dev": {
                 "doctrine/collections": "^1.0",
                 "doctrine/common": "^2.6",
@@ -878,16 +947,16 @@
         },
         {
             "name": "nikic/php-parser",
-            "version": "v4.13.0",
+            "version": "v4.13.2",
             "source": {
                 "type": "git",
                 "url": "https://github.com/nikic/PHP-Parser.git",
-                "reference": "50953a2691a922aa1769461637869a0a2faa3f53"
+                "reference": "210577fe3cf7badcc5814d99455df46564f3c077"
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             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/nikic/PHP-Parser/zipball/50953a2691a922aa1769461637869a0a2faa3f53",
-                "reference": "50953a2691a922aa1769461637869a0a2faa3f53",
+                "url": "https://api.github.com/repos/nikic/PHP-Parser/zipball/210577fe3cf7badcc5814d99455df46564f3c077",
+                "reference": "210577fe3cf7badcc5814d99455df46564f3c077",
                 "shasum": ""
             },
             "require": {
@@ -928,9 +997,9 @@
             ],
             "support": {
                 "issues": "https://github.com/nikic/PHP-Parser/issues",
-                "source": "https://github.com/nikic/PHP-Parser/tree/v4.13.0"
+                "source": "https://github.com/nikic/PHP-Parser/tree/v4.13.2"
             },
-            "time": "2021-09-20T12:20:58+00:00"
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