diff --git a/USPSBase.php b/USPSBase.php
index ee4d567..ee1274d 100644
--- a/USPSBase.php
+++ b/USPSBase.php
@@ -10,8 +10,8 @@
  * @author Vincent Gabriel
  */
 class USPSBase {
-    const LIVE_API_URL = 'http://production.shippingapis.com/ShippingAPI.dll';
-    const TEST_API_URL = 'http://production.shippingapis.com/ShippingAPITest.dll';
+    const LIVE_API_URL = 'https://production.shippingapis.com/ShippingAPI.dll';
+    const TEST_API_URL = 'https://stg-production.shippingapis.com/ShippingAPITest.dll';
 
   /**
    * @var string - the usps username provided by the usps website