diff --git a/app/Nova/Actions/MakePaymentNovaVisaMaster.php b/app/Nova/Actions/MakePaymentNovaVisaMaster.php
index 0a06387..6e42964 100644
--- a/app/Nova/Actions/MakePaymentNovaVisaMaster.php
+++ b/app/Nova/Actions/MakePaymentNovaVisaMaster.php
@@ -138,6 +138,7 @@ class MakePaymentNovaVisaMaster extends Action
 
             Text::make(__('USD ekwalendi'), 'usd_rate')
                 ->fullWidth()
+                ->readonly()
                 ->dependsOn('payment_amount', function ($field, $request, $formData) use ($usd_to_tmt) {
                     if ($formData->payment_amount) {
                         $field->setValue(number_format($formData->payment_amount / $usd_to_tmt, 2, '.', ''));