diff --git a/src/Proxmox/Helper/Api.php b/src/Proxmox/Helper/Api.php
index 48a2474..455ebac 100644
--- a/src/Proxmox/Helper/Api.php
+++ b/src/Proxmox/Helper/Api.php
@@ -181,7 +181,7 @@ public function getCSRFToken(): ?array
                 'verify' => false,
                 'debug' => $this->PVE->getDebug() ? fopen('php://stderr', 'w') : null,
                 'headers' => $this->defaultHeaders,
-                'form_params' => [
+                'json' => [
                     'username' => $this->PVE->getUsername(),
                     'password' => $this->PVE->getPassword(),
                     'realm' => $this->PVE->getAuthType(),