diff --git a/mbed_app.json b/mbed_app.json
index ab9f5e7..b24a964 100644
--- a/mbed_app.json
+++ b/mbed_app.json
@@ -45,7 +45,9 @@
             "mcuboot.signature-algorithm": "SIGNATURE_TYPE_EC256",
             "mcuboot.encrypt-ec256": true,
             "mcuboot.include-keys": null,
-            "mcuboot.bootloader-build": false
+            "mcuboot.bootloader-build": false,
+            "mcuboot.encrypt-scratch": true,
+            "mcuboot.swap-buf-size": 131072
         }
     }
 }