diff --git a/app/code/community/Hps/Transit/Model/Payment.php b/app/code/community/Hps/Transit/Model/Payment.php
index 23e0660..dfd2e43 100644
--- a/app/code/community/Hps/Transit/Model/Payment.php
+++ b/app/code/community/Hps/Transit/Model/Payment.php
@@ -139,7 +139,7 @@ private function _authorize(Varien_Object $payment, $amount, $capture)
                 $builder = Transaction::fromId($payment->getCcTransId())->capture();
             } else {
                 $requestType = $capture ? 'charge' : 'authorize';
-                $builder = $cardOrToken->{$requestType}(str_replace(',', '', (string) $amount))
+                $builder = $cardOrToken->{$requestType}($amount)
                     ->withCurrency(strtolower($order->getBaseCurrencyCode()))
                     ->withClientTransactionId(time())
                     ->withAddress($address)
@@ -231,7 +231,7 @@ public function refund(Varien_Object $payment, $amount)
         $customerId = $this->_getTxnCustomerId($order);
 
         try {
-            $refundResponse = Transaction::fromId($transactionId)->refund(str_replace(',', '', (string) $amount))
+            $refundResponse = Transaction::fromId($transactionId)->refund($amount)
                 ->withCurrency(strtolower($order->getBaseCurrencyCode()))
                 ->withDescription($memo)
                 ->withInvoiceNumber($invoiceNumber)
diff --git a/composer.json b/composer.json
index cae3a7d..451fa7c 100644
--- a/composer.json
+++ b/composer.json
@@ -13,6 +13,6 @@
         "openmage-module"
     ],
     "require": {
-        "globalpayments/php-sdk": "^2.2"
+        "globalpayments/php-sdk": "dev-transit-amount-fix"
     }
 }