diff --git a/src/Assert.php b/src/Assert.php
index 317cb258..31c861b9 100644
--- a/src/Assert.php
+++ b/src/Assert.php
@@ -2442,24 +2442,33 @@ public static function uuid(mixed $value, string|callable $message = ''): string
     {
         static::string($value, $message);
 
-        $originalValue = $value;
-        $value = \str_replace(['urn:', 'uuid:', '{', '}'], '', $value);
+        $uuid = '[0-9A-Fa-f]{8}-[0-9A-Fa-f]{4}-[0-9A-Fa-f]{4}-[0-9A-Fa-f]{4}-[0-9A-Fa-f]{12}';
 
-        // The nil UUID is special form of UUID that is specified to have all
-        // 128 bits set to zero.
-        if ('00000000-0000-0000-0000-000000000000' === $value) {
-            return $originalValue;
+        // URN form as specified by RFC 9562, e.g. "urn:uuid:ff6f8cb0-...".
+        if (\str_starts_with($value, 'urn:uuid:') && \preg_match('/^urn:uuid:'.$uuid.'$/D', $value)) {
+            return $value;
         }
 
-        if (!\preg_match('/^[0-9A-Fa-f]{8}-[0-9A-Fa-f]{4}-[0-9A-Fa-f]{4}-[0-9A-Fa-f]{4}-[0-9A-Fa-f]{12}$/D', $value)) {
-            $message = self::resolveMessage($message);
-            static::reportInvalidArgument(\sprintf(
-                $message ?: 'Value %s is not a valid UUID.',
-                static::valueToString($value)
-            ));
+        // "uuid:" prefix, optionally combined with the curly-braced form.
+        if (\str_starts_with($value, 'uuid:') && \preg_match('/^uuid:(?:'.$uuid.'|\{'.$uuid.'\})$/D', $value)) {
+            return $value;
+        }
+
+        // Curly-braced form; the braces must be a matching pair.
+        if (\str_starts_with($value, '{') && \str_ends_with($value, '}') && \preg_match('/^\{'.$uuid.'\}$/D', $value)) {
+            return $value;
         }
 
-        return $originalValue;
+        // Plain form, including the nil UUID with all 128 bits set to zero.
+        if (\preg_match('/^'.$uuid.'$/D', $value)) {
+            return $value;
+        }
+
+        $message = self::resolveMessage($message);
+        static::reportInvalidArgument(\sprintf(
+            $message ?: 'Value %s is not a valid UUID.',
+            static::valueToString($value)
+        ));
     }
 
     /**
diff --git a/tests/AssertTest.php b/tests/AssertTest.php
index 6c947c5b..f0ec064d 100644
--- a/tests/AssertTest.php
+++ b/tests/AssertTest.php
@@ -587,8 +587,9 @@ public static function getTests(): array
             ['isNonEmptyMap', [[]], false],
             ['isNonEmptyMap', [[1, 2, 3]], false],
             ['uuid', ['00000000-0000-0000-0000-000000000000'], true],
-            ['uuid', ['urn:ff6f8cb0-c57d-21e1-9b21-0800200c9a66'], true],
+            ['uuid', ['urn:uuid:ff6f8cb0-c57d-21e1-9b21-0800200c9a66'], true],
             ['uuid', ['uuid:{ff6f8cb0-c57d-21e1-9b21-0800200c9a66}'], true],
+            ['uuid', ['{ff6f8cb0-c57d-21e1-9b21-0800200c9a66}'], true],
             ['uuid', ['ff6f8cb0-c57d-21e1-9b21-0800200c9a66'], true],
             ['uuid', ['ff6f8cb0-c57d-11e1-9b21-0800200c9a66'], true],
             ['uuid', ['ff6f8cb0-c57d-31e1-9b21-0800200c9a66'], true],
@@ -603,6 +604,14 @@ public static function getTests(): array
             ['uuid', ['ff6f8cb0-c57da-51e1-9b21-0800200c9a66'], false],
             ['uuid', ['af6f8cb-c57d-11e1-9b21-0800200c9a66'], false],
             ['uuid', ['3f6f8cb0-c57d-11e1-9b21-0800200c9a6'], false],
+            ['uuid', ['f{}f6f8cb0-c57d-21e1-9b21-0800200c9a66'], false],
+            ['uuid', ['ff6f8cb0-c57d-21e1-9b21-08002urn:00c9a66'], false],
+            ['uuid', ['urn:ff6f8cb0-c57d-21e1-9b21-0800200c9a66uuid:'], false],
+            ['uuid', ['urn:ff6f8cb0-c57d-21e1-9b21-0800200c9a66'], false],
+            ['uuid', ['urn:uuid:{ff6f8cb0-c57d-21e1-9b21-0800200c9a66}'], false],
+            ['uuid', ['{}{}ff6f8cb0-c57d-21e1-9b21-0800200c9a66{}{}'], false],
+            ['uuid', ['{ff6f8cb0-c57d-21e1-9b21-0800200c9a66'], false],
+            ['uuid', ['ff6f8cb0-c57d-21e1-9b21-0800200c9a66}'], false],
             ['throws', [function () { throw new LogicException('test'); }, 'LogicException'], true],
             ['throws', [function () { throw new LogicException('test'); }, 'IllogicException'], false],
             ['throws', [function () { throw new Exception('test'); }], true],