diff --git a/LICENSE b/LICENSE
index 81cd964..40c919a 100644
--- a/LICENSE
+++ b/LICENSE
@@ -1,6 +1,6 @@
 Shadow Terms plugin for WordPress
 
-Copyright 2022-2025 by Happy Prime and contributors
+Copyright 2022-2026 by Happy Prime and contributors
 
 This program is free software; you can redistribute it and/or modify
 it under the terms of the GNU General Public License as published by
diff --git a/composer.json b/composer.json
index f2cf741..cf4aa85 100644
--- a/composer.json
+++ b/composer.json
@@ -4,9 +4,24 @@
 	"type": "wordpress-plugin",
 	"license": "GPL-2.0-or-later",
 	"minimum-stability": "stable",
+	"repositories": [
+		{
+			"type": "package",
+			"package": {
+				"name": "phpcompatibility/php-compatibility",
+				"type": "phpcodesniffer-standard",
+				"version": "9.99.9",
+				"source": {
+					"url": "https://github.com/PHPCompatibility/PHPCompatibility.git",
+					"type": "git",
+					"reference": "9f7142356b5674164a6f6dbe12a7a1bcc632db21"
+				}
+			}
+		}
+	],
 	"require-dev": {
 		"happyprime/coding-standards": "*",
-		"phpcompatibility/php-compatibility": "dev-develop as 9.99.99"
+		"phpcompatibility/php-compatibility": "9.99.9"
 	},
 	"scripts": {
 		"phpcs": "vendor/bin/phpcs",
diff --git a/composer.lock b/composer.lock
index cb99509..24b8848 100644
--- a/composer.lock
+++ b/composer.lock
@@ -4,34 +4,34 @@
         "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#installing-dependencies",
         "This file is @generated automatically"
     ],
-    "content-hash": "ef4f31e89fd5080e699fbe6a1f2fe363",
+    "content-hash": "1b04b7ff221629d6249ab48cbea72af4",
     "packages": [],
     "packages-dev": [
         {
             "name": "dealerdirect/phpcodesniffer-composer-installer",
-            "version": "v1.0.0",
+            "version": "v1.2.0",
             "source": {
                 "type": "git",
                 "url": "https://github.com/PHPCSStandards/composer-installer.git",
-                "reference": "4be43904336affa5c2f70744a348312336afd0da"
+                "reference": "845eb62303d2ca9b289ef216356568ccc075ffd1"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/PHPCSStandards/composer-installer/zipball/4be43904336affa5c2f70744a348312336afd0da",
-                "reference": "4be43904336affa5c2f70744a348312336afd0da",
+                "url": "https://api.github.com/repos/PHPCSStandards/composer-installer/zipball/845eb62303d2ca9b289ef216356568ccc075ffd1",
+                "reference": "845eb62303d2ca9b289ef216356568ccc075ffd1",
                 "shasum": ""
             },
             "require": {
-                "composer-plugin-api": "^1.0 || ^2.0",
+                "composer-plugin-api": "^2.2",
                 "php": ">=5.4",
-                "squizlabs/php_codesniffer": "^2.0 || ^3.1.0 || ^4.0"
+                "squizlabs/php_codesniffer": "^3.1.0 || ^4.0"
             },
             "require-dev": {
-                "composer/composer": "*",
+                "composer/composer": "^2.2",
                 "ext-json": "*",
                 "ext-zip": "*",
-                "php-parallel-lint/php-parallel-lint": "^1.3.1",
-                "phpcompatibility/php-compatibility": "^9.0",
+                "php-parallel-lint/php-parallel-lint": "^1.4.0",
+                "phpcompatibility/php-compatibility": "^9.0 || ^10.0.0@dev",
                 "yoast/phpunit-polyfills": "^1.0"
             },
             "type": "composer-plugin",
@@ -50,9 +50,9 @@
             "authors": [
                 {
                     "name": "Franck Nijhof",
-                    "email": "franck.nijhof@dealerdirect.com",
-                    "homepage": "http://www.frenck.nl",
-                    "role": "Developer / IT Manager"
+                    "email": "opensource@frenck.dev",
+                    "homepage": "https://frenck.dev",
+                    "role": "Open source developer"
                 },
                 {
                     "name": "Contributors",
@@ -60,7 +60,6 @@
                 }
             ],
             "description": "PHP_CodeSniffer Standards Composer Installer Plugin",
-            "homepage": "http://www.dealerdirect.com",
             "keywords": [
                 "PHPCodeSniffer",
                 "PHP_CodeSniffer",
@@ -81,9 +80,28 @@
             ],
             "support": {
                 "issues": "https://github.com/PHPCSStandards/composer-installer/issues",
+                "security": "https://github.com/PHPCSStandards/composer-installer/security/policy",
                 "source": "https://github.com/PHPCSStandards/composer-installer"
             },
-            "time": "2023-01-05T11:28:13+00:00"
+            "funding": [
+                {
+                    "url": "https://github.com/PHPCSStandards",
+                    "type": "github"
+                },
+                {
+                    "url": "https://github.com/jrfnl",
+                    "type": "github"
+                },
+                {
+                    "url": "https://opencollective.com/php_codesniffer",
+                    "type": "open_collective"
+                },
+                {
+                    "url": "https://thanks.dev/u/gh/phpcsstandards",
+                    "type": "thanks_dev"
+                }
+            ],
+            "time": "2025-11-11T04:32:07+00:00"
         },
         {
             "name": "doctrine/instantiator",
@@ -202,16 +220,16 @@
         },
         {
             "name": "myclabs/deep-copy",
-            "version": "1.13.1",
+            "version": "1.13.4",
             "source": {
                 "type": "git",
                 "url": "https://github.com/myclabs/DeepCopy.git",
-                "reference": "1720ddd719e16cf0db4eb1c6eca108031636d46c"
+                "reference": "07d290f0c47959fd5eed98c95ee5602db07e0b6a"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/myclabs/DeepCopy/zipball/1720ddd719e16cf0db4eb1c6eca108031636d46c",
-                "reference": "1720ddd719e16cf0db4eb1c6eca108031636d46c",
+                "url": "https://api.github.com/repos/myclabs/DeepCopy/zipball/07d290f0c47959fd5eed98c95ee5602db07e0b6a",
+                "reference": "07d290f0c47959fd5eed98c95ee5602db07e0b6a",
                 "shasum": ""
             },
             "require": {
@@ -250,7 +268,7 @@
             ],
             "support": {
                 "issues": "https://github.com/myclabs/DeepCopy/issues",
-                "source": "https://github.com/myclabs/DeepCopy/tree/1.13.1"
+                "source": "https://github.com/myclabs/DeepCopy/tree/1.13.4"
             },
             "funding": [
                 {
@@ -258,20 +276,20 @@
                     "type": "tidelift"
                 }
             ],
-            "time": "2025-04-29T12:36:36+00:00"
+            "time": "2025-08-01T08:46:24+00:00"
         },
         {
             "name": "nikic/php-parser",
-            "version": "v5.5.0",
+            "version": "v5.7.0",
             "source": {
                 "type": "git",
                 "url": "https://github.com/nikic/PHP-Parser.git",
-                "reference": "ae59794362fe85e051a58ad36b289443f57be7a9"
+                "reference": "dca41cd15c2ac9d055ad70dbfd011130757d1f82"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/nikic/PHP-Parser/zipball/ae59794362fe85e051a58ad36b289443f57be7a9",
-                "reference": "ae59794362fe85e051a58ad36b289443f57be7a9",
+                "url": "https://api.github.com/repos/nikic/PHP-Parser/zipball/dca41cd15c2ac9d055ad70dbfd011130757d1f82",
+                "reference": "dca41cd15c2ac9d055ad70dbfd011130757d1f82",
                 "shasum": ""
             },
             "require": {
@@ -290,7 +308,7 @@
             "type": "library",
             "extra": {
                 "branch-alias": {
-                    "dev-master": "5.0-dev"
+                    "dev-master": "5.x-dev"
                 }
             },
             "autoload": {
@@ -314,9 +332,9 @@
             ],
             "support": {
                 "issues": "https://github.com/nikic/PHP-Parser/issues",
-                "source": "https://github.com/nikic/PHP-Parser/tree/v5.5.0"
+                "source": "https://github.com/nikic/PHP-Parser/tree/v5.7.0"
             },
-            "time": "2025-05-31T08:24:38+00:00"
+            "time": "2025-12-06T11:56:16+00:00"
         },
         {
             "name": "phar-io/manifest",
@@ -438,16 +456,16 @@
         },
         {
             "name": "php-stubs/wordpress-stubs",
-            "version": "v6.8.1",
+            "version": "v6.9.1",
             "source": {
                 "type": "git",
                 "url": "https://github.com/php-stubs/wordpress-stubs.git",
-                "reference": "92e444847d94f7c30f88c60004648f507688acd5"
+                "reference": "f12220f303e0d7c0844c0e5e957b0c3cee48d2f7"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/php-stubs/wordpress-stubs/zipball/92e444847d94f7c30f88c60004648f507688acd5",
-                "reference": "92e444847d94f7c30f88c60004648f507688acd5",
+                "url": "https://api.github.com/repos/php-stubs/wordpress-stubs/zipball/f12220f303e0d7c0844c0e5e957b0c3cee48d2f7",
+                "reference": "f12220f303e0d7c0844c0e5e957b0c3cee48d2f7",
                 "shasum": ""
             },
             "conflict": {
@@ -455,12 +473,13 @@
             },
             "require-dev": {
                 "dealerdirect/phpcodesniffer-composer-installer": "^1.0",
-                "nikic/php-parser": "^5.4",
+                "nikic/php-parser": "^5.5",
                 "php": "^7.4 || ^8.0",
                 "php-stubs/generator": "^0.8.3",
-                "phpdocumentor/reflection-docblock": "^5.4.1",
+                "phpdocumentor/reflection-docblock": "^6.0",
                 "phpstan/phpstan": "^2.1",
                 "phpunit/phpunit": "^9.5",
+                "symfony/polyfill-php80": "*",
                 "szepeviktor/phpcs-psr-12-neutron-hybrid-ruleset": "^1.1.1",
                 "wp-coding-standards/wpcs": "3.1.0 as 2.3.0"
             },
@@ -483,22 +502,22 @@
             ],
             "support": {
                 "issues": "https://github.com/php-stubs/wordpress-stubs/issues",
-                "source": "https://github.com/php-stubs/wordpress-stubs/tree/v6.8.1"
+                "source": "https://github.com/php-stubs/wordpress-stubs/tree/v6.9.1"
             },
-            "time": "2025-05-02T12:33:34+00:00"
+            "time": "2026-02-03T19:29:21+00:00"
         },
         {
             "name": "php-stubs/wordpress-tests-stubs",
-            "version": "v6.8.0",
+            "version": "v6.9.0",
             "source": {
                 "type": "git",
                 "url": "https://github.com/php-stubs/wordpress-tests-stubs.git",
-                "reference": "95979e5c671c72350dde78b89e29afdd88c37140"
+                "reference": "1f60fb7b70b7e9e3fe02bf0a3b7d69c10e5e2953"
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-                "reference": "95979e5c671c72350dde78b89e29afdd88c37140",
+                "url": "https://api.github.com/repos/php-stubs/wordpress-tests-stubs/zipball/1f60fb7b70b7e9e3fe02bf0a3b7d69c10e5e2953",
+                "reference": "1f60fb7b70b7e9e3fe02bf0a3b7d69c10e5e2953",
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@@ -523,9 +542,9 @@
             ],
             "support": {
                 "issues": "https://github.com/php-stubs/wordpress-tests-stubs/issues",
-                "source": "https://github.com/php-stubs/wordpress-tests-stubs/tree/v6.8.0"
+                "source": "https://github.com/php-stubs/wordpress-tests-stubs/tree/v6.9.0"
             },
-            "time": "2025-04-15T20:54:04+00:00"
+            "time": "2025-12-07T09:14:02+00:00"
         },
         {
             "name": "php-stubs/wp-cli-stubs",
@@ -573,110 +592,26 @@
         },
         {
             "name": "phpcompatibility/php-compatibility",
-            "version": "dev-develop",
+            "version": "9.99.9",
             "source": {
                 "type": "git",
                 "url": "https://github.com/PHPCompatibility/PHPCompatibility.git",
-                "reference": "9013cd039fe5740953f9fdeebd19d901b80e26f2"
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-                "reference": "9013cd039fe5740953f9fdeebd19d901b80e26f2",
-                "shasum": ""
-            },
-            "require": {
-                "php": ">=5.4",
-                "phpcsstandards/phpcsutils": "^1.0.12",
-                "squizlabs/php_codesniffer": "^3.10.0"
-            },
-            "replace": {
-                "wimg/php-compatibility": "*"
-            },
-            "require-dev": {
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-                "php-parallel-lint/php-parallel-lint": "^1.4.0",
-                "phpcsstandards/phpcsdevcs": "^1.1.3",
-                "phpcsstandards/phpcsdevtools": "^1.2.0",
-                "phpunit/phpunit": "^4.8.36 || ^5.7.21 || ^6.0 || ^7.0 || ^8.0 || ^9.3.4 || ^10.1.0",
-                "yoast/phpunit-polyfills": "^1.0.5 || ^2.0.0"
-            },
-            "suggest": {
-                "roave/security-advisories": "dev-master || Helps prevent installing dependencies with known security issues."
-            },
-            "default-branch": true,
-            "type": "phpcodesniffer-standard",
-            "extra": {
-                "branch-alias": {
-                    "dev-master": "9.x-dev",
-                    "dev-develop": "10.x-dev"
-                }
-            },
-            "notification-url": "https://packagist.org/downloads/",
-            "license": [
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-            ],
-            "authors": [
-                {
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-                    "homepage": "https://github.com/wimg",
-                    "role": "lead"
-                },
-                {
-                    "name": "Juliette Reinders Folmer",
-                    "homepage": "https://github.com/jrfnl",
-                    "role": "lead"
-                },
-                {
-                    "name": "Contributors",
-                    "homepage": "https://github.com/PHPCompatibility/PHPCompatibility/graphs/contributors"
-                }
-            ],
-            "description": "A set of sniffs for PHP_CodeSniffer that checks for PHP cross-version compatibility.",
-            "homepage": "http://techblog.wimgodden.be/tag/codesniffer/",
-            "keywords": [
-                "compatibility",
-                "phpcs",
-                "standards",
-                "static analysis"
-            ],
-            "support": {
-                "issues": "https://github.com/PHPCompatibility/PHPCompatibility/issues",
-                "security": "https://github.com/PHPCompatibility/PHPCompatibility/security/policy",
-                "source": "https://github.com/PHPCompatibility/PHPCompatibility"
+                "reference": "9f7142356b5674164a6f6dbe12a7a1bcc632db21"
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-            "funding": [
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-                    "type": "github"
-                },
-                {
-                    "url": "https://github.com/jrfnl",
-                    "type": "github"
-                },
-                {
-                    "url": "https://opencollective.com/php_codesniffer",
-                    "type": "open_collective"
-                },
-                {
-                    "url": "https://thanks.dev/u/gh/phpcompatibility",
-                    "type": "thanks_dev"
-                }
-            ],
-            "time": "2025-01-20T20:06:48+00:00"
+            "type": "phpcodesniffer-standard"
         },
         {
             "name": "phpcompatibility/phpcompatibility-paragonie",
-            "version": "1.3.3",
+            "version": "1.3.4",
             "source": {
                 "type": "git",
                 "url": "https://github.com/PHPCompatibility/PHPCompatibilityParagonie.git",
-                "reference": "293975b465e0e709b571cbf0c957c6c0a7b9a2ac"
+                "reference": "244d7b04fc4bc2117c15f5abe23eb933b5f02bbf"
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-                "reference": "293975b465e0e709b571cbf0c957c6c0a7b9a2ac",
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@@ -733,22 +668,26 @@
                 {
                     "url": "https://opencollective.com/php_codesniffer",
                     "type": "open_collective"
+                },
+                {
+                    "url": "https://thanks.dev/u/gh/phpcompatibility",
+                    "type": "thanks_dev"
                 }
             ],
-            "time": "2024-04-24T21:30:46+00:00"
+            "time": "2025-09-19T17:43:28+00:00"
         },
         {
             "name": "phpcompatibility/phpcompatibility-wp",
-            "version": "2.1.7",
+            "version": "2.1.8",
             "source": {
                 "type": "git",
                 "url": "https://github.com/PHPCompatibility/PHPCompatibilityWP.git",
-                "reference": "5bfbbfbabb3df2b9a83e601de9153e4a7111962c"
+                "reference": "7c8d18b4d90dac9e86b0869a608fa09158e168fa"
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-                "reference": "5bfbbfbabb3df2b9a83e601de9153e4a7111962c",
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@@ -810,33 +749,33 @@
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-            "time": "2025-05-12T16:38:37+00:00"
+            "time": "2025-10-18T00:05:59+00:00"
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-            "version": "1.3.1",
+            "version": "1.5.0",
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-                "reference": "8cb1a93708f82778c5fdc46106998c2072565418",
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-                "phpcsstandards/phpcsutils": "^1.0.12",
-                "squizlabs/php_codesniffer": "^3.12.1"
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+                "squizlabs/php_codesniffer": "^3.13.5 || ^4.0.1"
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                 "php-parallel-lint/php-console-highlighter": "^1.0",
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-                "phpcsstandards/phpcsdevcs": "^1.1.6",
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@@ -892,32 +831,32 @@
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-            "time": "2025-06-08T19:59:14+00:00"
+            "time": "2025-11-12T23:06:57+00:00"
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+                "phpcompatibility/php-compatibility": "^10.0.0@dev",
                 "phpcsstandards/phpcsdevtools": "^1.2.0",
-                "phpunit/phpunit": "^4.0 || ^5.0 || ^6.0 || ^7.0 || ^8.0 || ^9.0"
+                "phpunit/phpunit": "^8.0 || ^9.0"
             },
             "suggest": {
                 "ext-iconv": "For improved results",
@@ -2932,7 +2912,7 @@
                     "type": "custom"
                 }
             ],
-            "time": "2024-03-25T16:39:00+00:00"
+            "time": "2025-11-25T12:08:04+00:00"
         },
         {
             "name": "yoast/phpunit-polyfills",
@@ -2998,18 +2978,9 @@
             "time": "2025-02-09T18:58:54+00:00"
         }
     ],
-    "aliases": [
-        {
-            "package": "phpcompatibility/php-compatibility",
-            "version": "dev-develop",
-            "alias": "9.99.99",
-            "alias_normalized": "9.99.99.0"
-        }
-    ],
+    "aliases": [],
     "minimum-stability": "stable",
-    "stability-flags": {
-        "phpcompatibility/php-compatibility": 20
-    },
+    "stability-flags": {},
     "prefer-stable": false,
     "prefer-lowest": false,
     "platform": {},
@@ -3017,5 +2988,5 @@
     "platform-overrides": {
         "php": "7.4"
     },
-    "plugin-api-version": "2.6.0"
+    "plugin-api-version": "2.9.0"
 }
diff --git a/includes/api.php b/includes/api.php
index 64ac3a5..e69af99 100644
--- a/includes/api.php
+++ b/includes/api.php
@@ -7,6 +7,10 @@
 
 namespace ShadowTerms\API;
 
+if ( ! defined( 'ABSPATH' ) ) {
+	exit;
+}
+
 /**
  * Retrieve a post's shadow taxonomy slug.
  *
diff --git a/includes/sync.php b/includes/sync.php
index 57d07fb..184f62f 100644
--- a/includes/sync.php
+++ b/includes/sync.php
@@ -7,6 +7,10 @@
 
 namespace ShadowTerms\Sync;
 
+if ( ! defined( 'ABSPATH' ) ) {
+	exit;
+}
+
 add_action( 'wp_after_insert_post', __NAMESPACE__ . '\sync_shadow_taxonomies', 10, 4 );
 add_action( 'deleted_post', __NAMESPACE__ . '\delete_term', 10, 2 );
 
diff --git a/includes/taxonomy.php b/includes/taxonomy.php
index f9bd276..482c995 100644
--- a/includes/taxonomy.php
+++ b/includes/taxonomy.php
@@ -9,6 +9,10 @@
 
 use ShadowTerms\API;
 
+if ( ! defined( 'ABSPATH' ) ) {
+	exit;
+}
+
 add_action( 'init', __NAMESPACE__ . '\register', 9999 );
 add_action( 'rest_api_init', __NAMESPACE__ . '\register_route' );
 
diff --git a/plugin.php b/plugin.php
index 33a442a..01f04be 100644
--- a/plugin.php
+++ b/plugin.php
@@ -26,9 +26,8 @@
 
 namespace ShadowTerms;
 
-// If this file is called directly, abort.
-if ( ! defined( 'WPINC' ) ) {
-	die;
+if ( ! defined( 'ABSPATH' ) ) {
+	exit;
 }
 
 require_once __DIR__ . '/includes/api.php';
diff --git a/readme.txt b/readme.txt
index 1b4c7c9..895aced 100644
--- a/readme.txt
+++ b/readme.txt
@@ -2,7 +2,7 @@
 Contributors: happyprime, jeremyfelt, slocker, philcable, wpgirl369
 Tags: terms, related, content
 Requires at least: 5.9
-Tested up to: 6.8
+Tested up to: 6.9
 Stable tag: 1.2.2
 License: GPLv2 or later
 Requires PHP: 7.4