diff --git a/composer.json b/composer.json
index 358802bc67c6e2b86f65f19e11bcae0cc515f9b5..6d3ab7d639aa85c31d8515687f1432b8e6331374 100644
--- a/composer.json
+++ b/composer.json
@@ -68,6 +68,7 @@
 		"symfony/mime": "^5.2",
 		"symfony/polyfill-intl-icu": "^1.6",
 		"symfony/polyfill-intl-idn": "^1.10",
+		"symfony/polyfill-intl-normalizer": "^1.22",
 		"symfony/polyfill-mbstring": "^1.2",
 		"symfony/property-access": "^5.2",
 		"symfony/property-info": "^5.2",
diff --git a/composer.lock b/composer.lock
index 71e18d33764702eed4ba0f986f0b57f9e43b993f..746190119bc86fe2695aec43b00fef322a2db4bb 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": "88af0d54fa97c2f9129dceb8dc331a28",
+    "content-hash": "2dc2c8cb2e24d2bd5a60678b0e5f48ad",
     "packages": [
         {
             "name": "bacon/bacon-qr-code",
@@ -3243,16 +3243,16 @@
         },
         {
             "name": "symfony/polyfill-intl-normalizer",
-            "version": "v1.20.0",
+            "version": "v1.22.1",
             "source": {
                 "type": "git",
                 "url": "https://github.com/symfony/polyfill-intl-normalizer.git",
-                "reference": "727d1096295d807c309fb01a851577302394c897"
+                "reference": "43a0283138253ed1d48d352ab6d0bdb3f809f248"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/symfony/polyfill-intl-normalizer/zipball/727d1096295d807c309fb01a851577302394c897",
-                "reference": "727d1096295d807c309fb01a851577302394c897",
+                "url": "https://api.github.com/repos/symfony/polyfill-intl-normalizer/zipball/43a0283138253ed1d48d352ab6d0bdb3f809f248",
+                "reference": "43a0283138253ed1d48d352ab6d0bdb3f809f248",
                 "shasum": ""
             },
             "require": {
@@ -3264,7 +3264,7 @@
             "type": "library",
             "extra": {
                 "branch-alias": {
-                    "dev-main": "1.20-dev"
+                    "dev-main": "1.22-dev"
                 },
                 "thanks": {
                     "name": "symfony/polyfill",
@@ -3307,7 +3307,7 @@
                 "shim"
             ],
             "support": {
-                "source": "https://github.com/symfony/polyfill-intl-normalizer/tree/v1.20.0"
+                "source": "https://github.com/symfony/polyfill-intl-normalizer/tree/v1.22.1"
             },
             "funding": [
                 {
@@ -3323,7 +3323,7 @@
                     "type": "tidelift"
                 }
             ],
-            "time": "2020-10-23T14:02:19+00:00"
+            "time": "2021-01-22T09:19:47+00:00"
         },
         {
             "name": "symfony/polyfill-mbstring",
diff --git a/typo3/sysext/core/Classes/DataHandling/SlugHelper.php b/typo3/sysext/core/Classes/DataHandling/SlugHelper.php
index d5fca085c6e3344acff27142fcb294bdf3176604..630cbc8c5df28ba6c59527d9d6265636cad7d031 100644
--- a/typo3/sysext/core/Classes/DataHandling/SlugHelper.php
+++ b/typo3/sysext/core/Classes/DataHandling/SlugHelper.php
@@ -114,6 +114,10 @@ class SlugHelper
         $fallbackCharacter = (string)($this->configuration['fallbackCharacter'] ?? '-');
         $slug = preg_replace('/[ \t\x{00A0}\-+_]+/u', $fallbackCharacter, $slug);
 
+        if (!\Normalizer::isNormalized((string)$slug)) {
+            $slug = \Normalizer::normalize((string)$slug);
+        }
+
         // Convert extended letters to ascii equivalents
         // The specCharsToASCII() converts "€" to "EUR"
         $slug = GeneralUtility::makeInstance(CharsetConverter::class)->specCharsToASCII('utf-8', $slug);
diff --git a/typo3/sysext/core/Tests/Unit/DataHandling/SlugHelperTest.php b/typo3/sysext/core/Tests/Unit/DataHandling/SlugHelperTest.php
index 580754e89bf1e61b9f277ca0f15d36437961dbd0..18e81adbb10d975cff6d31ce3008691919b36a85 100644
--- a/typo3/sysext/core/Tests/Unit/DataHandling/SlugHelperTest.php
+++ b/typo3/sysext/core/Tests/Unit/DataHandling/SlugHelperTest.php
@@ -132,6 +132,11 @@ class SlugHelperTest extends UnitTestCase
                 'bla-arg应---用-ascii',
                 'bla-arg应-用-ascii'
             ],
+            'non-normalized characters' => [
+                [],
+                hex2bin('667275cc88686e65757a6569746c696368656e'),
+                'fruehneuzeitlichen'
+            ],
         ];
     }
 
diff --git a/typo3/sysext/core/composer.json b/typo3/sysext/core/composer.json
index 3ddc2c75b82b33d6824c5a4f39d0ee9b3fc341c4..a3ecb827976bf59dd37be4ddd7c485b6d3b22e8b 100644
--- a/typo3/sysext/core/composer.json
+++ b/typo3/sysext/core/composer.json
@@ -55,6 +55,7 @@
 		"symfony/mime": "^5.2",
 		"symfony/polyfill-intl-icu": "^1.6",
 		"symfony/polyfill-intl-idn": "^1.10",
+		"symfony/polyfill-intl-normalizer": "^1.22",
 		"symfony/polyfill-mbstring": "^1.2",
 		"symfony/routing": "^5.2",
 		"symfony/yaml": "^5.2",