diff --git a/coap/coap-request.js b/coap/coap-request.js
index 7d71e3a..edfb380 100644
--- a/coap/coap-request.js
+++ b/coap/coap-request.js
@@ -75,12 +75,7 @@ module.exports = function (RED) {
             reqOpts.headers["Content-Format"] = config["content-format"];
             reqOpts.multicast = config.multicast;
             reqOpts.multicastTimeout = config.multicastTimeout;
-            reqOpts.confirmable = msg.confirmable;
-
-            if (reqOpts.confirmable == null) {
-
-                reqOpts.confirmable = config.confirmable;
-            }
+            reqOpts.confirmable = msg.confirmable ?? config.confirmable ?? true;
 
             function _onResponse(res) {
                 function _send(payload) {
diff --git a/package.json b/package.json
index f154c95..6f20960 100644
--- a/package.json
+++ b/package.json
@@ -29,7 +29,7 @@
     "reporter": "spec"
   },
   "jshintConfig": {
-    "esversion": 6,
+    "esversion": 11,
     "curly": true,
     "forin": true,
     "immed": true,