diff --git a/.github/workflows/ci.yaml b/.github/workflows/ci.yaml
index 93f75ac..2b3d73c 100644
--- a/.github/workflows/ci.yaml
+++ b/.github/workflows/ci.yaml
@@ -11,7 +11,7 @@ jobs:
       - uses: actions/checkout@v4
       - uses: shivammathur/setup-php@v2
         with:
-          php-version: '8.1'
+          php-version: '8.2'
           coverage: none
       - run: composer update --no-progress
       - run: composer update --no-progress --working-dir=dev-tools
diff --git a/composer.json b/composer.json
index 1317e34..29353d1 100644
--- a/composer.json
+++ b/composer.json
@@ -16,7 +16,7 @@
         "php": "^7.0 || ^8.0",
         "ext-dom": "*",
         "ext-libxml": "*",
-        "phpunit/phpunit": "^6.5.14 || ^7.5.20 || ^8.0 || ^9.0 || ^10.0"
+        "phpunit/phpunit": "^6.5.14 || ^7.5.20 || ^8.0 || ^9.0 || ^10.0 || ^11.0"
     },
     "autoload": {
         "psr-4": {
diff --git a/dev-tools/composer.json b/dev-tools/composer.json
index 1c2f9c1..b6475f3 100644
--- a/dev-tools/composer.json
+++ b/dev-tools/composer.json
@@ -1,6 +1,6 @@
 {
     "require": {
-        "php": "^8.1"
+        "php": "^8.2"
     },
     "require-dev": {
         "ergebnis/composer-normalize": "*",
diff --git a/src/Constraint/XmlMatchesXsd.php b/src/Constraint/XmlMatchesXsd.php
index f981ab5..5d7c6da 100644
--- a/src/Constraint/XmlMatchesXsd.php
+++ b/src/Constraint/XmlMatchesXsd.php
@@ -16,6 +16,8 @@
     class_alias(XmlMatchesXsdForV5::class, XmlMatchesXsd::class);
 } elseif (version_compare(\PHPUnit\Runner\Version::id(), '8.0.0') < 0) {
     class_alias(XmlMatchesXsdForV7::class, XmlMatchesXsd::class);
-} else {
+} elseif (version_compare(\PHPUnit\Runner\Version::id(), '11.0.0') < 0) {
     class_alias(XmlMatchesXsdForV8::class, XmlMatchesXsd::class);
+} else {
+    class_alias(XmlMatchesXsdForV11::class, XmlMatchesXsd::class);
 }
diff --git a/src/Constraint/XmlMatchesXsdForV11.php b/src/Constraint/XmlMatchesXsdForV11.php
new file mode 100644
index 0000000..23b9ea4
--- /dev/null
+++ b/src/Constraint/XmlMatchesXsdForV11.php
@@ -0,0 +1,114 @@
+<?php
+
+/*
+ * This file is part of PHP CS Fixer / PHPUnit Constraint XmlMatchesXsd.
+ *
+ * (c) SpacePossum
+ *     Dariusz Rumiński <dariusz.ruminski@gmail.com>
+ *
+ * This source file is subject to the MIT license that is bundled
+ * with this source code in the file LICENSE.
+ */
+
+namespace PhpCsFixer\PhpunitConstraintXmlMatchesXsd\Constraint;
+
+use PHPUnit\Framework\Constraint\Constraint;
+
+/**
+ * @internal
+ */
+final readonly class XmlMatchesXsdForV11 extends Constraint
+{
+    /**
+     * @var string[]
+     */
+    private array $xmlConstraintErrors;
+
+    public function __construct(private string $xsd)
+    {
+        // replace first only
+        $needle = 'http://www.w3.org/2001/xml.xsd';
+        if (false !== $pos = strpos($xsd, $needle)) {
+            $xsd = substr_replace($xsd, 'file:///'.str_replace('\\', '/', __DIR__).'/xml.xsd', $pos, \strlen($needle));
+        }
+
+        $this->xsd = $xsd;
+    }
+
+    public function toString(): string
+    {
+        return 'matches XSD';
+    }
+
+    protected function failureDescription($other): string
+    {
+        if (\is_string($other)) {
+            return sprintf("%s %s.\n%s", $other, $this->toString(), implode("\n", $this->xmlConstraintErrors));
+        }
+
+        if (\is_object($other)) {
+            $type = sprintf('%s#%s', \get_class($other), method_exists($other, '__toString') ? $other->__toString() : '');
+        } elseif (null === $other) {
+            $type = 'null';
+        } else {
+            $type = \gettype($other).'#'.$other;
+        }
+
+        return $type.' '.$this->toString();
+    }
+
+    protected function matches($other): bool
+    {
+        return \is_string($other)
+            ? $this->stringMatches($other)
+            : false;
+    }
+
+    private function stringMatches(string $other): bool
+    {
+        $internalErrors = libxml_use_internal_errors(true);
+        libxml_clear_errors();
+
+        $dom = new \DOMDocument();
+        $dom->preserveWhiteSpace = false;
+        $dom->validateOnParse = true;
+
+        if (!@$dom->loadXML($other, LIBXML_NONET | (\defined('LIBXML_COMPACT') ? LIBXML_COMPACT : 0))) {
+            $this->setXMLConstraintErrors();
+            libxml_clear_errors();
+            libxml_use_internal_errors($internalErrors);
+
+            return false;
+        }
+
+        $dom->normalizeDocument();
+
+        libxml_clear_errors();
+
+        if (false === $result = @$dom->schemaValidateSource($this->xsd)) {
+            $this->setXMLConstraintErrors();
+        }
+
+        libxml_clear_errors();
+        libxml_use_internal_errors($internalErrors);
+
+        return $result;
+    }
+
+    private function setXMLConstraintErrors()
+    {
+        foreach (libxml_get_errors() as $error) {
+            if (LIBXML_ERR_WARNING === $error->level) {
+                $level = 'warning ';
+            } elseif (LIBXML_ERR_ERROR === $error->level) {
+                $level = 'error ';
+            } elseif (LIBXML_ERR_FATAL === $error->level) {
+                $level = 'fatal ';
+            } else {
+                $level = '';
+            }
+
+            $this->xmlConstraintErrors[] = sprintf('[%s%s] %s (line %d, column %d).', $level, $error->code, trim($error->message), $error->line, $error->column);
+        }
+    }
+}