diff --git a/.babelrc b/.babelrc
index 1fbfa9a..51ac658 100644
--- a/.babelrc
+++ b/.babelrc
@@ -1,3 +1,4 @@
 {
-    "presets": ["es2015","es2017"]
+    "presets": ["es2015","es2017"],
+    "plugins": ["transform-object-rest-spread"]
 }
diff --git a/.jshintrc b/.jshintrc
index 7c0e08e..c3fb0ac 100644
--- a/.jshintrc
+++ b/.jshintrc
@@ -1,30 +1,31 @@
 {
     "bitwise": true,
     "curly": true,
     "eqeqeq": true,
     "forin": true,
     "freeze": true,
     "latedef": "function",
     "noarg": true,
     "nonbsp": true,
     "nonew": true,
     "plusplus": true,
     "undef": true,
     "unused": true,
     "strict": true,
     "maxparams": 4,
     "maxdepth": 4,
     "maxstatements": 70,
     "maxlen": 140,
     "validthis": true,
     "varstmt": true,
     "esversion": 8,
     "browser": true,
     "browserify": true,
     "devel": false,
     "jquery": false,
     "mocha": false,
     "node": true,
     "worker": false,
+    "esversion": 9,
     "predef": ["MediaStream", "MediaStreamTrack", "RTCPeerConnection", "RTCSessionDescription"]
 }
diff --git a/package.json b/package.json
index 6df1542..3a78a89 100644
--- a/package.json
+++ b/package.json
@@ -1,55 +1,56 @@
 {
   "name": "sylkrtc",
   "version": "1.5.9",
   "main": "lib/sylkrtc.js",
   "description": "SylkServer WebRTC Gateway client library",
   "repository": {
     "type": "git",
     "url": "git://github.com/AGProjects/sylkrtc.git"
   },
   "keywords": [],
   "author": "AG Projects",
   "contributors": [
     "Tijmen de Mes <tijmen@ag-projects.com>",
     "Saúl Ibarra Corretgé <saul@ag-projects.com>"
   ],
   "license": "MIT",
   "readmeFilename": "README.md",
   "browserify": {
     "transform": [
       "babelify"
     ]
   },
   "dependencies": {
     "@rifflearning/attachmediastream": "^3.0.0",
     "blueimp-md5": "^2.13.0",
     "bowser": "^2.7.0",
     "debug": "^4.1.1",
     "dompurify": "^2.0.10",
     "openpgp": "tijmenNL/openpgpjs#4eb26e0",
     "regenerator-runtime": "^0.13.9",
     "sdp-transform": "^2.3.0",
     "uuid": "^7.0.3",
     "webrtc-adapter": "^6.4.8",
     "websocket": "^1.0.34"
   },
   "devDependencies": {
     "babel-core": "^6.26.3",
+    "babel-plugin-transform-object-rest-spread": "^6.26.0",
     "babel-preset-es2015": "^6.9.0",
     "babel-preset-es2017": "^6.24.1",
     "babelify": "^8.0.0",
     "browserify": "^16.5.1",
     "gulp": "^4.0.2",
     "gulp-filelog": "^0.4.1",
     "gulp-header": "^2.0.9",
     "gulp-jshint": "^2.0.1",
     "gulp-sourcemaps": "^2.6.1",
     "gulp-uglify": "^3.0.0",
     "jshint": "^2.9.5",
     "jshint-stylish": "^2.2.0",
     "minimist": "^1.2.0",
     "through2": "^3.0.1",
     "vinyl-buffer": "^1.0.0",
     "vinyl-source-stream": "^2.0.0"
   }
 }