diff --git a/composer.json b/composer.json
index 3e68f25..054cc26 100644
--- a/composer.json
+++ b/composer.json
@@ -27,7 +27,7 @@
         "php-soap/engine": "^2.16",
         "php-soap/wsdl": "^1.14",
         "php-soap/xml": "^1.9",
-        "php-soap/wsdl-reader": "^0.27"
+        "php-soap/wsdl-reader": "^0.29"
     },
     "require-dev": {
         "vimeo/psalm": "~6.13",
diff --git a/src/Xml/Writer/XsiAttributeBuilder.php b/src/Xml/Writer/XsiAttributeBuilder.php
index 1d62a41..639c397 100644
--- a/src/Xml/Writer/XsiAttributeBuilder.php
+++ b/src/Xml/Writer/XsiAttributeBuilder.php
@@ -39,6 +39,12 @@ public static function forEncodedValue(
             return children([]);
         }
 
+        // Skip xsi:type declaration for anonymous complexTypes : they don't have an accessible name.
+        $meta = $context->type->getMeta();
+        if ($meta->isLocal()->unwrapOr(false)) {
+            return children([]);
+        }
+
         [$xsiType, $includeXsiTargetNamespace] = match(true) {
             $encoder instanceof Feature\XsiTypeCalculator => [
                 $encoder->resolveXsiTypeForValue($context, $value),
diff --git a/tests/PhpCompatibility/Schema036Test.php b/tests/PhpCompatibility/Schema036Test.php
index 95e55df..5acd0e9 100644
--- a/tests/PhpCompatibility/Schema036Test.php
+++ b/tests/PhpCompatibility/Schema036Test.php
@@ -49,7 +49,7 @@ protected function expectXml(): string
                 <tns:test>
                     <testParam xsi:type="tns:testType">
                         <int xsi:type="xsd:int">123</int>
-                        <testType2 xsi:type="tns:testType2">
+                        <testType2>
                             <int xsi:type="xsd:int">123</int>
                         </testType2>
                     </testParam>