diff --git a/.circleci/config.yml b/.circleci/config.yml
index 5b48f30..10ff280 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -3,10 +3,10 @@ version: 2.1
 jobs:
   build:
     docker:
-      - image: circleci/php:7.1-node-browsers
+      - image: circleci/php:8.1-node-browsers
     environment:
       # When changing, also change in Dockerfile
-      WP_VERSION: 5.5
+      WP_VERSION: 6.3.1
       CC_TEST_REPORTER_ID: e0f9cea32e63c566325e5e215707327897269674b0ab91f57e4326612ef5dcc8
     steps:
       - run:
diff --git a/.github/workflows/lint.yml b/.github/workflows/lint.yml
index 4890b32..0fe49ee 100644
--- a/.github/workflows/lint.yml
+++ b/.github/workflows/lint.yml
@@ -25,7 +25,7 @@ jobs:
       - name: Install PHP dependencies with Composer
         uses: php-actions/composer@v6
         with:
-          php_version: '7.4'
+          php_version: '8.1'
           version: 2.x
 
       - name: Install npm dependencies
diff --git a/Dockerfile b/Dockerfile
index ab3f2e4..6217237 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,16 +1,14 @@
-FROM php:7.3-apache-buster
+FROM php:8.1-apache-buster
 
 # When changings, also change in .circleci/config.yml
-ENV WP_VERSION=5.5
+ENV WP_VERSION=6.3.1
 
 RUN apt-get update \
       && apt-get install -y libpng-dev libjpeg62-turbo-dev libzip-dev
 
-RUN docker-php-ext-configure gd --with-jpeg-dir=/usr/include/
+RUN docker-php-ext-configure gd --with-jpeg
 RUN docker-php-ext-install gd mysqli pdo_mysql zip
 
-RUN docker-php-ext-configure zip --with-libzip
-
 # These apache modules are required and not enabled by default in this image
 RUN a2enmod rewrite headers xml2enc proxy proxy_fcgi
 
diff --git a/composer.json b/composer.json
index 9c66ead..004a5d8 100644
--- a/composer.json
+++ b/composer.json
@@ -3,12 +3,12 @@
   "type": "library",
   "description": "Starter Docker installation for WordPress Websites",
   "require": {
-    "php": ">=5.6",
-    "vlucas/phpdotenv": "4.1.1",
+    "php": "^8.1",
+    "vlucas/phpdotenv": "4.3",
     "wpackagist-plugin/wordpress-seo": "^18.0",
     "wpackagist-plugin/meta-box": "^5.3",
     "timber/timber": "^1.18",
-    "friendsoftwig/twigcs": "^3.2"
+    "friendsoftwig/twigcs": "^5.2"
   },
   "repositories":[
     {
@@ -18,16 +18,15 @@
   ],
   "require-dev": {
     "squizlabs/php_codesniffer": "*",
-    "wp-coding-standards/wpcs": "^2.2"
+    "wp-coding-standards/wpcs": "^3.0.0"
   },
   "config": {
     "allow-plugins": {
-      "composer/installers": true
+      "composer/installers": true,
+      "dealerdirect/phpcodesniffer-composer-installer": true
     }
   },
   "scripts": {
-    "post-install-cmd": "vendor/squizlabs/php_codesniffer/bin/phpcs --config-set installed_paths vendor/wp-coding-standards/wpcs",
-    "post-update-cmd" : "vendor/squizlabs/php_codesniffer/bin/phpcs --config-set installed_paths vendor/wp-coding-standards/wpcs",
     "lint:wpcs": "vendor/squizlabs/php_codesniffer/bin/phpcs --standard=sparkpress-standard.xml --extensions=php ./src/php"
   }
 }
diff --git a/composer.lock b/composer.lock
index cdb6d2e..39fa590 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": "fef5d687f95d5291faf2e7b3847de94b",
+    "content-hash": "d8709812e51aa7f35a0e00a574e1d81f",
     "packages": [
         {
             "name": "altorouter/altorouter",
@@ -213,27 +213,30 @@
         },
         {
             "name": "friendsoftwig/twigcs",
-            "version": "v3.2.2",
+            "version": "5.2.0",
             "source": {
                 "type": "git",
                 "url": "https://github.com/friendsoftwig/twigcs.git",
-                "reference": "7c4bc76dad8d851045b9eeab4979a240550f8300"
+                "reference": "5123655a918d232788da4d7b0545c9f75b08023a"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/friendsoftwig/twigcs/zipball/7c4bc76dad8d851045b9eeab4979a240550f8300",
-                "reference": "7c4bc76dad8d851045b9eeab4979a240550f8300",
+                "url": "https://api.github.com/repos/friendsoftwig/twigcs/zipball/5123655a918d232788da4d7b0545c9f75b08023a",
+                "reference": "5123655a918d232788da4d7b0545c9f75b08023a",
                 "shasum": ""
             },
             "require": {
-                "php": "^7.0",
-                "pimple/pimple": "^3.0",
-                "symfony/console": "^2.7 || ^3.0 || ^4.0 || ^5.0",
-                "symfony/finder": "^2.7 || ^3.0 || ^4.0 || ^5.0",
-                "twig/twig": "^1.41 || ^2.10 || ^3.0"
+                "ext-ctype": "*",
+                "ext-json": "*",
+                "ext-mbstring": "*",
+                "ext-simplexml": "*",
+                "php": "^7.4 || ^8.0",
+                "symfony/console": "^4.4 || ^5.3 || ^6.0",
+                "symfony/filesystem": "^4.4 || ^5.3 || ^6.0",
+                "symfony/finder": "^4.4 || ^5.3 || ^6.0"
             },
             "require-dev": {
-                "phpunit/phpunit": "^7.2 || ^6.5"
+                "phpunit/phpunit": "^9.5.20"
             },
             "bin": [
                 "bin/twigcs"
@@ -241,8 +244,7 @@
             "type": "library",
             "autoload": {
                 "psr-4": {
-                    "Allocine\\Twigcs\\": "src/",
-                    "Allocine\\Twigcs\\Tests\\": "tests/"
+                    "FriendsOfTwig\\Twigcs\\": "src/"
                 }
             },
             "notification-url": "https://packagist.org/downloads/",
@@ -251,16 +253,16 @@
             ],
             "authors": [
                 {
-                    "name": "OwlyCode",
+                    "name": "Tristan Maindron",
                     "email": "tmaindron@gmail.com"
                 }
             ],
             "description": "Checkstyle automation for Twig",
             "support": {
                 "issues": "https://github.com/friendsoftwig/twigcs/issues",
-                "source": "https://github.com/friendsoftwig/twigcs/tree/v3.2.2"
+                "source": "https://github.com/friendsoftwig/twigcs/tree/5.2.0"
             },
-            "time": "2019-10-26T10:36:59+00:00"
+            "time": "2022-04-28T11:29:58+00:00"
         },
         {
             "name": "phpoption/phpoption",
@@ -338,76 +340,28 @@
             "time": "2023-02-25T19:38:58+00:00"
         },
         {
-            "name": "pimple/pimple",
-            "version": "v3.5.0",
+            "name": "psr/container",
+            "version": "2.0.2",
             "source": {
                 "type": "git",
-                "url": "https://github.com/silexphp/Pimple.git",
-                "reference": "a94b3a4db7fb774b3d78dad2315ddc07629e1bed"
+                "url": "https://github.com/php-fig/container.git",
+                "reference": "c71ecc56dfe541dbd90c5360474fbc405f8d5963"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/silexphp/Pimple/zipball/a94b3a4db7fb774b3d78dad2315ddc07629e1bed",
-                "reference": "a94b3a4db7fb774b3d78dad2315ddc07629e1bed",
+                "url": "https://api.github.com/repos/php-fig/container/zipball/c71ecc56dfe541dbd90c5360474fbc405f8d5963",
+                "reference": "c71ecc56dfe541dbd90c5360474fbc405f8d5963",
                 "shasum": ""
             },
             "require": {
-                "php": ">=7.2.5",
-                "psr/container": "^1.1 || ^2.0"
-            },
-            "require-dev": {
-                "symfony/phpunit-bridge": "^5.4@dev"
+                "php": ">=7.4.0"
             },
             "type": "library",
             "extra": {
                 "branch-alias": {
-                    "dev-master": "3.4.x-dev"
-                }
-            },
-            "autoload": {
-                "psr-0": {
-                    "Pimple": "src/"
-                }
-            },
-            "notification-url": "https://packagist.org/downloads/",
-            "license": [
-                "MIT"
-            ],
-            "authors": [
-                {
-                    "name": "Fabien Potencier",
-                    "email": "fabien@symfony.com"
+                    "dev-master": "2.0.x-dev"
                 }
-            ],
-            "description": "Pimple, a simple Dependency Injection Container",
-            "homepage": "https://pimple.symfony.com",
-            "keywords": [
-                "container",
-                "dependency injection"
-            ],
-            "support": {
-                "source": "https://github.com/silexphp/Pimple/tree/v3.5.0"
-            },
-            "time": "2021-10-28T11:13:42+00:00"
-        },
-        {
-            "name": "psr/container",
-            "version": "1.1.1",
-            "source": {
-                "type": "git",
-                "url": "https://github.com/php-fig/container.git",
-                "reference": "8622567409010282b7aeebe4bb841fe98b58dcaf"
-            },
-            "dist": {
-                "type": "zip",
-                "url": "https://api.github.com/repos/php-fig/container/zipball/8622567409010282b7aeebe4bb841fe98b58dcaf",
-                "reference": "8622567409010282b7aeebe4bb841fe98b58dcaf",
-                "shasum": ""
-            },
-            "require": {
-                "php": ">=7.2.0"
             },
-            "type": "library",
             "autoload": {
                 "psr-4": {
                     "Psr\\Container\\": "src/"
@@ -434,58 +388,49 @@
             ],
             "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/2.0.2"
             },
-            "time": "2021-03-05T17:36:06+00:00"
+            "time": "2021-11-05T16:47:00+00:00"
         },
         {
             "name": "symfony/console",
-            "version": "v5.4.28",
+            "version": "v6.3.4",
             "source": {
                 "type": "git",
                 "url": "https://github.com/symfony/console.git",
-                "reference": "f4f71842f24c2023b91237c72a365306f3c58827"
+                "reference": "eca495f2ee845130855ddf1cf18460c38966c8b6"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/symfony/console/zipball/f4f71842f24c2023b91237c72a365306f3c58827",
-                "reference": "f4f71842f24c2023b91237c72a365306f3c58827",
+                "url": "https://api.github.com/repos/symfony/console/zipball/eca495f2ee845130855ddf1cf18460c38966c8b6",
+                "reference": "eca495f2ee845130855ddf1cf18460c38966c8b6",
                 "shasum": ""
             },
             "require": {
-                "php": ">=7.2.5",
-                "symfony/deprecation-contracts": "^2.1|^3",
+                "php": ">=8.1",
+                "symfony/deprecation-contracts": "^2.5|^3",
                 "symfony/polyfill-mbstring": "~1.0",
-                "symfony/polyfill-php73": "^1.9",
-                "symfony/polyfill-php80": "^1.16",
-                "symfony/service-contracts": "^1.1|^2|^3",
-                "symfony/string": "^5.1|^6.0"
+                "symfony/service-contracts": "^2.5|^3",
+                "symfony/string": "^5.4|^6.0"
             },
             "conflict": {
-                "psr/log": ">=3",
-                "symfony/dependency-injection": "<4.4",
-                "symfony/dotenv": "<5.1",
-                "symfony/event-dispatcher": "<4.4",
-                "symfony/lock": "<4.4",
-                "symfony/process": "<4.4"
+                "symfony/dependency-injection": "<5.4",
+                "symfony/dotenv": "<5.4",
+                "symfony/event-dispatcher": "<5.4",
+                "symfony/lock": "<5.4",
+                "symfony/process": "<5.4"
             },
             "provide": {
-                "psr/log-implementation": "1.0|2.0"
+                "psr/log-implementation": "1.0|2.0|3.0"
             },
             "require-dev": {
-                "psr/log": "^1|^2",
-                "symfony/config": "^4.4|^5.0|^6.0",
-                "symfony/dependency-injection": "^4.4|^5.0|^6.0",
-                "symfony/event-dispatcher": "^4.4|^5.0|^6.0",
-                "symfony/lock": "^4.4|^5.0|^6.0",
-                "symfony/process": "^4.4|^5.0|^6.0",
-                "symfony/var-dumper": "^4.4|^5.0|^6.0"
-            },
-            "suggest": {
-                "psr/log": "For using the console logger",
-                "symfony/event-dispatcher": "",
-                "symfony/lock": "",
-                "symfony/process": ""
+                "psr/log": "^1|^2|^3",
+                "symfony/config": "^5.4|^6.0",
+                "symfony/dependency-injection": "^5.4|^6.0",
+                "symfony/event-dispatcher": "^5.4|^6.0",
+                "symfony/lock": "^5.4|^6.0",
+                "symfony/process": "^5.4|^6.0",
+                "symfony/var-dumper": "^5.4|^6.0"
             },
             "type": "library",
             "autoload": {
@@ -519,7 +464,7 @@
                 "terminal"
             ],
             "support": {
-                "source": "https://github.com/symfony/console/tree/v5.4.28"
+                "source": "https://github.com/symfony/console/tree/v6.3.4"
             },
             "funding": [
                 {
@@ -535,29 +480,29 @@
                     "type": "tidelift"
                 }
             ],
-            "time": "2023-08-07T06:12:30+00:00"
+            "time": "2023-08-16T10:10:12+00:00"
         },
         {
             "name": "symfony/deprecation-contracts",
-            "version": "v2.5.2",
+            "version": "v3.3.0",
             "source": {
                 "type": "git",
                 "url": "https://github.com/symfony/deprecation-contracts.git",
-                "reference": "e8b495ea28c1d97b5e0c121748d6f9b53d075c66"
+                "reference": "7c3aff79d10325257a001fcf92d991f24fc967cf"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/symfony/deprecation-contracts/zipball/e8b495ea28c1d97b5e0c121748d6f9b53d075c66",
-                "reference": "e8b495ea28c1d97b5e0c121748d6f9b53d075c66",
+                "url": "https://api.github.com/repos/symfony/deprecation-contracts/zipball/7c3aff79d10325257a001fcf92d991f24fc967cf",
+                "reference": "7c3aff79d10325257a001fcf92d991f24fc967cf",
                 "shasum": ""
             },
             "require": {
-                "php": ">=7.1"
+                "php": ">=8.1"
             },
             "type": "library",
             "extra": {
                 "branch-alias": {
-                    "dev-main": "2.5-dev"
+                    "dev-main": "3.4-dev"
                 },
                 "thanks": {
                     "name": "symfony/contracts",
@@ -586,7 +531,70 @@
             "description": "A generic function and convention to trigger deprecation notices",
             "homepage": "https://symfony.com",
             "support": {
-                "source": "https://github.com/symfony/deprecation-contracts/tree/v2.5.2"
+                "source": "https://github.com/symfony/deprecation-contracts/tree/v3.3.0"
+            },
+            "funding": [
+                {
+                    "url": "https://symfony.com/sponsor",
+                    "type": "custom"
+                },
+                {
+                    "url": "https://github.com/fabpot",
+                    "type": "github"
+                },
+                {
+                    "url": "https://tidelift.com/funding/github/packagist/symfony/symfony",
+                    "type": "tidelift"
+                }
+            ],
+            "time": "2023-05-23T14:45:45+00:00"
+        },
+        {
+            "name": "symfony/filesystem",
+            "version": "v6.3.1",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/symfony/filesystem.git",
+                "reference": "edd36776956f2a6fcf577edb5b05eb0e3bdc52ae"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/symfony/filesystem/zipball/edd36776956f2a6fcf577edb5b05eb0e3bdc52ae",
+                "reference": "edd36776956f2a6fcf577edb5b05eb0e3bdc52ae",
+                "shasum": ""
+            },
+            "require": {
+                "php": ">=8.1",
+                "symfony/polyfill-ctype": "~1.8",
+                "symfony/polyfill-mbstring": "~1.8"
+            },
+            "type": "library",
+            "autoload": {
+                "psr-4": {
+                    "Symfony\\Component\\Filesystem\\": ""
+                },
+                "exclude-from-classmap": [
+                    "/Tests/"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "authors": [
+                {
+                    "name": "Fabien Potencier",
+                    "email": "fabien@symfony.com"
+                },
+                {
+                    "name": "Symfony Community",
+                    "homepage": "https://symfony.com/contributors"
+                }
+            ],
+            "description": "Provides basic utilities for the filesystem",
+            "homepage": "https://symfony.com",
+            "support": {
+                "source": "https://github.com/symfony/filesystem/tree/v6.3.1"
             },
             "funding": [
                 {
@@ -602,26 +610,27 @@
                     "type": "tidelift"
                 }
             ],
-            "time": "2022-01-02T09:53:40+00:00"
+            "time": "2023-06-01T08:30:39+00:00"
         },
         {
             "name": "symfony/finder",
-            "version": "v5.4.27",
+            "version": "v6.3.3",
             "source": {
                 "type": "git",
                 "url": "https://github.com/symfony/finder.git",
-                "reference": "ff4bce3c33451e7ec778070e45bd23f74214cd5d"
+                "reference": "9915db259f67d21eefee768c1abcf1cc61b1fc9e"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/symfony/finder/zipball/ff4bce3c33451e7ec778070e45bd23f74214cd5d",
-                "reference": "ff4bce3c33451e7ec778070e45bd23f74214cd5d",
+                "url": "https://api.github.com/repos/symfony/finder/zipball/9915db259f67d21eefee768c1abcf1cc61b1fc9e",
+                "reference": "9915db259f67d21eefee768c1abcf1cc61b1fc9e",
                 "shasum": ""
             },
             "require": {
-                "php": ">=7.2.5",
-                "symfony/deprecation-contracts": "^2.1|^3",
-                "symfony/polyfill-php80": "^1.16"
+                "php": ">=8.1"
+            },
+            "require-dev": {
+                "symfony/filesystem": "^6.0"
             },
             "type": "library",
             "autoload": {
@@ -649,7 +658,7 @@
             "description": "Finds files and directories via an intuitive fluent interface",
             "homepage": "https://symfony.com",
             "support": {
-                "source": "https://github.com/symfony/finder/tree/v5.4.27"
+                "source": "https://github.com/symfony/finder/tree/v6.3.3"
             },
             "funding": [
                 {
@@ -665,7 +674,7 @@
                     "type": "tidelift"
                 }
             ],
-            "time": "2023-07-31T08:02:31+00:00"
+            "time": "2023-07-31T08:31:44+00:00"
         },
         {
             "name": "symfony/polyfill-ctype",
@@ -1073,197 +1082,31 @@
             ],
             "time": "2023-01-26T09:26:14+00:00"
         },
-        {
-            "name": "symfony/polyfill-php73",
-            "version": "v1.28.0",
-            "source": {
-                "type": "git",
-                "url": "https://github.com/symfony/polyfill-php73.git",
-                "reference": "fe2f306d1d9d346a7fee353d0d5012e401e984b5"
-            },
-            "dist": {
-                "type": "zip",
-                "url": "https://api.github.com/repos/symfony/polyfill-php73/zipball/fe2f306d1d9d346a7fee353d0d5012e401e984b5",
-                "reference": "fe2f306d1d9d346a7fee353d0d5012e401e984b5",
-                "shasum": ""
-            },
-            "require": {
-                "php": ">=7.1"
-            },
-            "type": "library",
-            "extra": {
-                "branch-alias": {
-                    "dev-main": "1.28-dev"
-                },
-                "thanks": {
-                    "name": "symfony/polyfill",
-                    "url": "https://github.com/symfony/polyfill"
-                }
-            },
-            "autoload": {
-                "files": [
-                    "bootstrap.php"
-                ],
-                "psr-4": {
-                    "Symfony\\Polyfill\\Php73\\": ""
-                },
-                "classmap": [
-                    "Resources/stubs"
-                ]
-            },
-            "notification-url": "https://packagist.org/downloads/",
-            "license": [
-                "MIT"
-            ],
-            "authors": [
-                {
-                    "name": "Nicolas Grekas",
-                    "email": "p@tchwork.com"
-                },
-                {
-                    "name": "Symfony Community",
-                    "homepage": "https://symfony.com/contributors"
-                }
-            ],
-            "description": "Symfony polyfill backporting some PHP 7.3+ features to lower PHP versions",
-            "homepage": "https://symfony.com",
-            "keywords": [
-                "compatibility",
-                "polyfill",
-                "portable",
-                "shim"
-            ],
-            "support": {
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-                "dealerdirect/phpcodesniffer-composer-installer": "^0.6 || This Composer plugin will sort out the PHPCS 'installed_paths' automatically."
+                "ext-iconv": "For improved results",
+                "ext-mbstring": "For improved results"
             },
             "type": "phpcodesniffer-standard",
             "notification-url": "https://packagist.org/downloads/",
@@ -1887,6 +1965,7 @@
             "keywords": [
                 "phpcs",
                 "standards",
+                "static analysis",
                 "wordpress"
             ],
             "support": {
@@ -1894,7 +1973,13 @@
                 "source": "https://github.com/WordPress/WordPress-Coding-Standards",
                 "wiki": "https://github.com/WordPress/WordPress-Coding-Standards/wiki"
             },
-            "time": "2020-05-13T23:57:56+00:00"
+            "funding": [
+                {
+                    "url": "https://opencollective.com/thewpcc/contribute/wp-php-63406",
+                    "type": "custom"
+                }
+            ],
+            "time": "2023-09-14T07:06:09+00:00"
         }
     ],
     "aliases": [],
@@ -1903,8 +1988,8 @@
     "prefer-stable": false,
     "prefer-lowest": false,
     "platform": {
-        "php": ">=5.6"
+        "php": "^8.1"
     },
     "platform-dev": [],
-    "plugin-api-version": "2.3.0"
+    "plugin-api-version": "2.6.0"
 }
diff --git a/package.json b/package.json
index 217a13e..f5caabf 100644
--- a/package.json
+++ b/package.json
@@ -22,7 +22,7 @@
     "test": "mocha src/**/*spec.js",
     "test:ci": "nyc --reporter=lcov mocha",
     "lint:js": "eslint src/js",
-    "lint:php": "./scripts/run.sh vendor/bin/phpcs --standard=sparkpress-standard.xml --extensions=php src/php",
+    "lint:php": "./scripts/run.sh vendor/bin/phpcs --standard=sparkpress-standard.xml --extensions=php src/php -s -n",
     "lint:scss": "stylelint src/scss/**/*.scss src/scss/*.scss --color --formatter verbose",
     "lint:twig": "./scripts/run.sh vendor/bin/twigcs src/php/views",
     "lint": "run-s lint:*",