diff --git a/composer.json b/composer.json
index ff2ae155..0514cc4d 100644
--- a/composer.json
+++ b/composer.json
@@ -25,6 +25,7 @@
         "psr/container": "^2.0",
         "respect/string-formatter": "^1.6",
         "respect/stringifier": "^3.0",
+        "symfony/polyfill-intl-idn": "^1.33",
         "symfony/polyfill-mbstring": "^1.33"
     },
     "require-dev": {
diff --git a/composer.lock b/composer.lock
index acbb3bdf..3a9bafa7 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": "049a227c54ff9b04b7f415bbc9cf6924",
+    "content-hash": "fa9f29c82a049d9f491ccfc5af541b2d",
     "packages": [
         {
             "name": "laravel/serializable-closure",
@@ -250,16 +250,16 @@
         },
         {
             "name": "respect/string-formatter",
-            "version": "1.6.0",
+            "version": "1.6.1",
             "source": {
                 "type": "git",
                 "url": "https://github.com/Respect/StringFormatter.git",
-                "reference": "3696f0f79dfb62572ea85fc678ca5c9bcde5c8bd"
+                "reference": "4c3bfd069c0704f38715b6208d8b22fa4fcc8376"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/Respect/StringFormatter/zipball/3696f0f79dfb62572ea85fc678ca5c9bcde5c8bd",
-                "reference": "3696f0f79dfb62572ea85fc678ca5c9bcde5c8bd",
+                "url": "https://api.github.com/repos/Respect/StringFormatter/zipball/4c3bfd069c0704f38715b6208d8b22fa4fcc8376",
+                "reference": "4c3bfd069c0704f38715b6208d8b22fa4fcc8376",
                 "shasum": ""
             },
             "require": {
@@ -302,9 +302,9 @@
             "description": "A powerful and flexible way of formatting and transforming strings",
             "support": {
                 "issues": "https://github.com/Respect/StringFormatter/issues",
-                "source": "https://github.com/Respect/StringFormatter/tree/1.6.0"
+                "source": "https://github.com/Respect/StringFormatter/tree/1.6.1"
             },
-            "time": "2026-02-09T12:35:58+00:00"
+            "time": "2026-02-09T12:41:42+00:00"
         },
         {
             "name": "respect/stringifier",
@@ -363,6 +363,178 @@
             },
             "time": "2026-01-19T10:24:52+00:00"
         },
+        {
+            "name": "symfony/polyfill-intl-idn",
+            "version": "v1.33.0",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/symfony/polyfill-intl-idn.git",
+                "reference": "9614ac4d8061dc257ecc64cba1b140873dce8ad3"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/symfony/polyfill-intl-idn/zipball/9614ac4d8061dc257ecc64cba1b140873dce8ad3",
+                "reference": "9614ac4d8061dc257ecc64cba1b140873dce8ad3",
+                "shasum": ""
+            },
+            "require": {
+                "php": ">=7.2",
+                "symfony/polyfill-intl-normalizer": "^1.10"
+            },
+            "suggest": {
+                "ext-intl": "For best performance"
+            },
+            "type": "library",
+            "extra": {
+                "thanks": {
+                    "url": "https://github.com/symfony/polyfill",
+                    "name": "symfony/polyfill"
+                }
+            },
+            "autoload": {
+                "files": [
+                    "bootstrap.php"
+                ],
+                "psr-4": {
+                    "Symfony\\Polyfill\\Intl\\Idn\\": ""
+                }
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "authors": [
+                {
+                    "name": "Laurent Bassin",
+                    "email": "laurent@bassin.info"
+                },
+                {
+                    "name": "Trevor Rowbotham",
+                    "email": "trevor.rowbotham@pm.me"
+                },
+                {
+                    "name": "Symfony Community",
+                    "homepage": "https://symfony.com/contributors"
+                }
+            ],
+            "description": "Symfony polyfill for intl's idn_to_ascii and idn_to_utf8 functions",
+            "homepage": "https://symfony.com",
+            "keywords": [
+                "compatibility",
+                "idn",
+                "intl",
+                "polyfill",
+                "portable",
+                "shim"
+            ],
+            "support": {
+                "source": "https://github.com/symfony/polyfill-intl-idn/tree/v1.33.0"
+            },
+            "funding": [
+                {
+                    "url": "https://symfony.com/sponsor",
+                    "type": "custom"
+                },
+                {
+                    "url": "https://github.com/fabpot",
+                    "type": "github"
+                },
+                {
+                    "url": "https://github.com/nicolas-grekas",
+                    "type": "github"
+                },
+                {
+                    "url": "https://tidelift.com/funding/github/packagist/symfony/symfony",
+                    "type": "tidelift"
+                }
+            ],
+            "time": "2024-09-10T14:38:51+00:00"
+        },
+        {
+            "name": "symfony/polyfill-intl-normalizer",
+            "version": "v1.33.0",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/symfony/polyfill-intl-normalizer.git",
+                "reference": "3833d7255cc303546435cb650316bff708a1c75c"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/symfony/polyfill-intl-normalizer/zipball/3833d7255cc303546435cb650316bff708a1c75c",
+                "reference": "3833d7255cc303546435cb650316bff708a1c75c",
+                "shasum": ""
+            },
+            "require": {
+                "php": ">=7.2"
+            },
+            "suggest": {
+                "ext-intl": "For best performance"
+            },
+            "type": "library",
+            "extra": {
+                "thanks": {
+                    "url": "https://github.com/symfony/polyfill",
+                    "name": "symfony/polyfill"
+                }
+            },
+            "autoload": {
+                "files": [
+                    "bootstrap.php"
+                ],
+                "psr-4": {
+                    "Symfony\\Polyfill\\Intl\\Normalizer\\": ""
+                },
+                "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 for intl's Normalizer class and related functions",
+            "homepage": "https://symfony.com",
+            "keywords": [
+                "compatibility",
+                "intl",
+                "normalizer",
+                "polyfill",
+                "portable",
+                "shim"
+            ],
+            "support": {
+                "source": "https://github.com/symfony/polyfill-intl-normalizer/tree/v1.33.0"
+            },
+            "funding": [
+                {
+                    "url": "https://symfony.com/sponsor",
+                    "type": "custom"
+                },
+                {
+                    "url": "https://github.com/fabpot",
+                    "type": "github"
+                },
+                {
+                    "url": "https://github.com/nicolas-grekas",
+                    "type": "github"
+                },
+                {
+                    "url": "https://tidelift.com/funding/github/packagist/symfony/symfony",
+                    "type": "tidelift"
+                }
+            ],
+            "time": "2024-09-09T11:45:10+00:00"
+        },
         {
             "name": "symfony/polyfill-mbstring",
             "version": "v1.33.0",
@@ -627,16 +799,16 @@
         },
         {
             "name": "brick/math",
-            "version": "0.14.6",
+            "version": "0.14.7",
             "source": {
                 "type": "git",
                 "url": "https://github.com/brick/math.git",
-                "reference": "32498d5e1897e7642c0b961ace2df6d7dc9a3bc3"
+                "reference": "07ff363b16ef8aca9692bba3be9e73fe63f34e50"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/brick/math/zipball/32498d5e1897e7642c0b961ace2df6d7dc9a3bc3",
-                "reference": "32498d5e1897e7642c0b961ace2df6d7dc9a3bc3",
+                "url": "https://api.github.com/repos/brick/math/zipball/07ff363b16ef8aca9692bba3be9e73fe63f34e50",
+                "reference": "07ff363b16ef8aca9692bba3be9e73fe63f34e50",
                 "shasum": ""
             },
             "require": {
@@ -675,7 +847,7 @@
             ],
             "support": {
                 "issues": "https://github.com/brick/math/issues",
-                "source": "https://github.com/brick/math/tree/0.14.6"
+                "source": "https://github.com/brick/math/tree/0.14.7"
             },
             "funding": [
                 {
@@ -683,7 +855,7 @@
                     "type": "github"
                 }
             ],
-            "time": "2026-02-05T07:59:58+00:00"
+            "time": "2026-02-07T10:57:35+00:00"
         },
         {
             "name": "dealerdirect/phpcodesniffer-composer-installer",
@@ -916,29 +1088,29 @@
         },
         {
             "name": "doctrine/deprecations",
-            "version": "1.1.5",
+            "version": "1.1.6",
             "source": {
                 "type": "git",
                 "url": "https://github.com/doctrine/deprecations.git",
-                "reference": "459c2f5dd3d6a4633d3b5f46ee2b1c40f57d3f38"
+                "reference": "d4fe3e6fd9bb9e72557a19674f44d8ac7db4c6ca"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/doctrine/deprecations/zipball/459c2f5dd3d6a4633d3b5f46ee2b1c40f57d3f38",
-                "reference": "459c2f5dd3d6a4633d3b5f46ee2b1c40f57d3f38",
+                "url": "https://api.github.com/repos/doctrine/deprecations/zipball/d4fe3e6fd9bb9e72557a19674f44d8ac7db4c6ca",
+                "reference": "d4fe3e6fd9bb9e72557a19674f44d8ac7db4c6ca",
                 "shasum": ""
             },
             "require": {
                 "php": "^7.1 || ^8.0"
             },
             "conflict": {
-                "phpunit/phpunit": "<=7.5 || >=13"
+                "phpunit/phpunit": "<=7.5 || >=14"
             },
             "require-dev": {
-                "doctrine/coding-standard": "^9 || ^12 || ^13",
-                "phpstan/phpstan": "1.4.10 || 2.1.11",
+                "doctrine/coding-standard": "^9 || ^12 || ^14",
+                "phpstan/phpstan": "1.4.10 || 2.1.30",
                 "phpstan/phpstan-phpunit": "^1.0 || ^2",
-                "phpunit/phpunit": "^7.5 || ^8.5 || ^9.6 || ^10.5 || ^11.5 || ^12",
+                "phpunit/phpunit": "^7.5 || ^8.5 || ^9.6 || ^10.5 || ^11.5 || ^12.4 || ^13.0",
                 "psr/log": "^1 || ^2 || ^3"
             },
             "suggest": {
@@ -958,9 +1130,9 @@
             "homepage": "https://www.doctrine-project.org/",
             "support": {
                 "issues": "https://github.com/doctrine/deprecations/issues",
-                "source": "https://github.com/doctrine/deprecations/tree/1.1.5"
+                "source": "https://github.com/doctrine/deprecations/tree/1.1.6"
             },
-            "time": "2025-04-07T20:06:18+00:00"
+            "time": "2026-02-07T07:09:04+00:00"
         },
         {
             "name": "doctrine/lexer",
@@ -5623,178 +5795,6 @@
             ],
             "time": "2025-06-27T09:58:17+00:00"
         },
-        {
-            "name": "symfony/polyfill-intl-idn",
-            "version": "v1.33.0",
-            "source": {
-                "type": "git",
-                "url": "https://github.com/symfony/polyfill-intl-idn.git",
-                "reference": "9614ac4d8061dc257ecc64cba1b140873dce8ad3"
-            },
-            "dist": {
-                "type": "zip",
-                "url": "https://api.github.com/repos/symfony/polyfill-intl-idn/zipball/9614ac4d8061dc257ecc64cba1b140873dce8ad3",
-                "reference": "9614ac4d8061dc257ecc64cba1b140873dce8ad3",
-                "shasum": ""
-            },
-            "require": {
-                "php": ">=7.2",
-                "symfony/polyfill-intl-normalizer": "^1.10"
-            },
-            "suggest": {
-                "ext-intl": "For best performance"
-            },
-            "type": "library",
-            "extra": {
-                "thanks": {
-                    "url": "https://github.com/symfony/polyfill",
-                    "name": "symfony/polyfill"
-                }
-            },
-            "autoload": {
-                "files": [
-                    "bootstrap.php"
-                ],
-                "psr-4": {
-                    "Symfony\\Polyfill\\Intl\\Idn\\": ""
-                }
-            },
-            "notification-url": "https://packagist.org/downloads/",
-            "license": [
-                "MIT"
-            ],
-            "authors": [
-                {
-                    "name": "Laurent Bassin",
-                    "email": "laurent@bassin.info"
-                },
-                {
-                    "name": "Trevor Rowbotham",
-                    "email": "trevor.rowbotham@pm.me"
-                },
-                {
-                    "name": "Symfony Community",
-                    "homepage": "https://symfony.com/contributors"
-                }
-            ],
-            "description": "Symfony polyfill for intl's idn_to_ascii and idn_to_utf8 functions",
-            "homepage": "https://symfony.com",
-            "keywords": [
-                "compatibility",
-                "idn",
-                "intl",
-                "polyfill",
-                "portable",
-                "shim"
-            ],
-            "support": {
-                "source": "https://github.com/symfony/polyfill-intl-idn/tree/v1.33.0"
-            },
-            "funding": [
-                {
-                    "url": "https://symfony.com/sponsor",
-                    "type": "custom"
-                },
-                {
-                    "url": "https://github.com/fabpot",
-                    "type": "github"
-                },
-                {
-                    "url": "https://github.com/nicolas-grekas",
-                    "type": "github"
-                },
-                {
-                    "url": "https://tidelift.com/funding/github/packagist/symfony/symfony",
-                    "type": "tidelift"
-                }
-            ],
-            "time": "2024-09-10T14:38:51+00:00"
-        },
-        {
-            "name": "symfony/polyfill-intl-normalizer",
-            "version": "v1.33.0",
-            "source": {
-                "type": "git",
-                "url": "https://github.com/symfony/polyfill-intl-normalizer.git",
-                "reference": "3833d7255cc303546435cb650316bff708a1c75c"
-            },
-            "dist": {
-                "type": "zip",
-                "url": "https://api.github.com/repos/symfony/polyfill-intl-normalizer/zipball/3833d7255cc303546435cb650316bff708a1c75c",
-                "reference": "3833d7255cc303546435cb650316bff708a1c75c",
-                "shasum": ""
-            },
-            "require": {
-                "php": ">=7.2"
-            },
-            "suggest": {
-                "ext-intl": "For best performance"
-            },
-            "type": "library",
-            "extra": {
-                "thanks": {
-                    "url": "https://github.com/symfony/polyfill",
-                    "name": "symfony/polyfill"
-                }
-            },
-            "autoload": {
-                "files": [
-                    "bootstrap.php"
-                ],
-                "psr-4": {
-                    "Symfony\\Polyfill\\Intl\\Normalizer\\": ""
-                },
-                "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 for intl's Normalizer class and related functions",
-            "homepage": "https://symfony.com",
-            "keywords": [
-                "compatibility",
-                "intl",
-                "normalizer",
-                "polyfill",
-                "portable",
-                "shim"
-            ],
-            "support": {
-                "source": "https://github.com/symfony/polyfill-intl-normalizer/tree/v1.33.0"
-            },
-            "funding": [
-                {
-                    "url": "https://symfony.com/sponsor",
-                    "type": "custom"
-                },
-                {
-                    "url": "https://github.com/fabpot",
-                    "type": "github"
-                },
-                {
-                    "url": "https://github.com/nicolas-grekas",
-                    "type": "github"
-                },
-                {
-                    "url": "https://tidelift.com/funding/github/packagist/symfony/symfony",
-                    "type": "tidelift"
-                }
-            ],
-            "time": "2024-09-09T11:45:10+00:00"
-        },
         {
             "name": "symfony/process",
             "version": "v8.0.5",
@@ -6440,5 +6440,5 @@
         "php": ">=8.5"
     },
     "platform-dev": {},
-    "plugin-api-version": "2.6.0"
+    "plugin-api-version": "2.9.0"
 }
diff --git a/data/domain/public-suffix/ישראל.php b/data/domain/public-suffix/XN--4DBRK0CE.php
similarity index 100%
rename from data/domain/public-suffix/ישראל.php
rename to data/domain/public-suffix/XN--4DBRK0CE.php
diff --git a/data/domain/public-suffix/СРБ.php b/data/domain/public-suffix/XN--90A3AC.php
similarity index 100%
rename from data/domain/public-suffix/СРБ.php
rename to data/domain/public-suffix/XN--90A3AC.php
diff --git a/data/domain/public-suffix/香港.php b/data/domain/public-suffix/XN--J6W193G.php
similarity index 100%
rename from data/domain/public-suffix/香港.php
rename to data/domain/public-suffix/XN--J6W193G.php
diff --git a/data/domain/public-suffix/ไทย.php b/data/domain/public-suffix/XN--O3CW4H.php
similarity index 100%
rename from data/domain/public-suffix/ไทย.php
rename to data/domain/public-suffix/XN--O3CW4H.php
diff --git a/src-dev/Commands/UpdateDomainSuffixesCommand.php b/src-dev/Commands/UpdateDomainSuffixesCommand.php
index 9e33949f..475b19d1 100644
--- a/src-dev/Commands/UpdateDomainSuffixesCommand.php
+++ b/src-dev/Commands/UpdateDomainSuffixesCommand.php
@@ -25,6 +25,7 @@ use function dirname;
 use function explode;
 use function file_get_contents;
 use function glob;
+use function idn_to_ascii;
 use function is_dir;
 use function mb_strtoupper;
 use function mkdir;
@@ -37,6 +38,9 @@ use function str_starts_with;
 use function trim;
 use function unlink;
 
+use const IDNA_DEFAULT;
+use const INTL_IDNA_VARIANT_UTS46;
+
 #[AsCommand(
     name: 'update:domain-suffixes',
     description: 'Update list of public domain suffixes',
@@ -103,11 +107,13 @@ final class UpdateDomainSuffixesCommand extends Command
                 continue;
             }
 
+            $punycodedTld = idn_to_ascii($tld, IDNA_DEFAULT, INTL_IDNA_VARIANT_UTS46) ?: $tld;
+
             $this->dataSaver->save(
                 $suffixList,
                 '2007–22 Mozilla Foundation',
                 'MPL-2.0-no-copyleft-exception',
-                sprintf('domain/public-suffix/%s.php', $tld),
+                sprintf('domain/public-suffix/%s.php', $punycodedTld),
             );
 
             $progressBar->advance();
diff --git a/src/Validators/PublicDomainSuffix.php b/src/Validators/PublicDomainSuffix.php
index 5e0cbf93..ac483476 100644
--- a/src/Validators/PublicDomainSuffix.php
+++ b/src/Validators/PublicDomainSuffix.php
@@ -19,11 +19,15 @@ use Respect\Validation\Validators\Core\Simple;
 
 use function array_pop;
 use function explode;
+use function idn_to_ascii;
 use function in_array;
 use function is_scalar;
 use function mb_strtoupper;
 use function strtoupper;
 
+use const IDNA_DEFAULT;
+use const INTL_IDNA_VARIANT_UTS46;
+
 #[Attribute(Attribute::TARGET_PROPERTY | Attribute::IS_REPEATABLE)]
 #[Template(
     '{{subject}} must be a public domain suffix',
@@ -41,8 +45,12 @@ final class PublicDomainSuffix extends Simple
 
         $parts = explode('.', (string) $input);
         $tld = array_pop($parts);
+        if ($tld === '') {
+            return true;
+        }
 
-        $dataSource = DataLoader::load('domain/public-suffix/' . mb_strtoupper($tld) . '.php');
+        $punycodedTld = idn_to_ascii($tld, IDNA_DEFAULT, INTL_IDNA_VARIANT_UTS46) ?: $tld;
+        $dataSource = DataLoader::load('domain/public-suffix/' . mb_strtoupper($punycodedTld) . '.php');
         if ($this->isUndefined($input) && $dataSource === []) {
             return true;
         }