diff --git a/src/Command/Extension/UploadExtensionVersionCommand.php b/src/Command/Extension/UploadExtensionVersionCommand.php
index e0b7c8d..3c06f10 100644
--- a/src/Command/Extension/UploadExtensionVersionCommand.php
+++ b/src/Command/Extension/UploadExtensionVersionCommand.php
@@ -24,6 +24,7 @@
 use TYPO3\Tailor\Filesystem;
 use TYPO3\Tailor\Formatter\ConsoleFormatter;
 use TYPO3\Tailor\Helper\CommandHelper;
+use TYPO3\Tailor\HttpClientFactory;
 use TYPO3\Tailor\Service\VersionService;
 
 /**
@@ -75,8 +76,11 @@ protected function getRequestConfiguration(): RequestConfiguration
             'POST',
             'extension/' . $this->extensionKey . '/' . $this->version,
             [],
-            $formDataPart->bodyToIterable(),
-            $formDataPart->getPreparedHeaders()->toArray()
+            [],
+            [],
+            false,
+            HttpClientFactory::ALL_AUTH,
+            $formDataPart
         );
     }
 
diff --git a/src/Dto/RequestConfiguration.php b/src/Dto/RequestConfiguration.php
index 18c976e..47cf070 100644
--- a/src/Dto/RequestConfiguration.php
+++ b/src/Dto/RequestConfiguration.php
@@ -12,6 +12,7 @@
 
 namespace TYPO3\Tailor\Dto;
 
+use Symfony\Component\Mime\Part\Multipart\FormDataPart;
 use TYPO3\Tailor\HttpClientFactory;
 
 /**
@@ -35,6 +36,9 @@ class RequestConfiguration
     /** @var iterable */
     protected $body;
 
+    /** @var FormDataPart|null */
+    protected $formData;
+
     /** @var iterable */
     protected $headers;
 
@@ -54,7 +58,8 @@ public function __construct(
         iterable $body = [],
         iterable $headers = [],
         bool $raw = false,
-        int $defaultAuthMethod = HttpClientFactory::ALL_AUTH
+        int $defaultAuthMethod = HttpClientFactory::ALL_AUTH,
+        ?FormDataPart $formData = null
     ) {
         $this->method = $method;
         $this->endpoint = $endpoint;
@@ -63,6 +68,7 @@ public function __construct(
         $this->headers = $headers;
         $this->raw = $raw;
         $this->defaultAuthMethod = $defaultAuthMethod;
+        $this->formData = $formData;
     }
 
     public function getMethod(): string
@@ -85,9 +91,20 @@ public function getBody(): iterable
         return $this->body;
     }
 
+    public function getFormData(): ?FormDataPart
+    {
+        return $this->formData;
+    }
+
     public function getHeaders(): iterable
     {
-        return $this->headers;
+        $headers = $this->headers;
+        if ($this->formData) {
+            foreach ($this->formData->getPreparedHeaders()->all() as $key => $value) {
+                $headers[$key] = $value->getBodyAsString();
+            }
+        }
+        return $headers;
     }
 
     public function setRaw(bool $raw): self
diff --git a/src/HttpClientFactory.php b/src/HttpClientFactory.php
index cffa215..00334f7 100644
--- a/src/HttpClientFactory.php
+++ b/src/HttpClientFactory.php
@@ -48,6 +48,8 @@ public static function create(RequestConfiguration $requestConfiguration): HttpC
         }
         if ($requestConfiguration->getBody() !== []) {
             $options['body'] = $requestConfiguration->getBody();
+        } elseif ($requestConfiguration->getFormData()) {
+            $options['body'] = $requestConfiguration->getFormData()->bodyToString();
         }
         if (($defaultAuthMethod === self::BEARER_AUTH || $defaultAuthMethod === self::ALL_AUTH)
             && Variables::has('TYPO3_API_TOKEN')