diff --git a/dev/boot.js b/dev/boot.js
index 97a82d8f4..df120ab42 100644
--- a/dev/boot.js
+++ b/dev/boot.js
@@ -2,6 +2,8 @@
 import window from 'window';
 import elementDatasetPolyfill from 'element-dataset';
 
+import 'es6-object-assign/auto';
+
 import {Promise} from 'es6-promise-polyfill/promise.js';
 import {progressJs} from '../vendors/Progress.js/src/progress.js';
 
diff --git a/package.json b/package.json
index 13eeeb687..b7481db6f 100644
--- a/package.json
+++ b/package.json
@@ -65,6 +65,7 @@
     "copy-webpack-plugin": "4.5.1",
     "element-dataset": "2.2.6",
     "emailjs-addressparser": "2.0.2",
+    "es6-object-assign": "1.1.0",
     "es6-promise-polyfill": "1.2.0",
     "eslint": "4.19.1",
     "eslint-plugin-compat": "2.2.0",
@@ -103,8 +104,8 @@
     "json-loader": "0.5.7",
     "json3": "3.3.2",
     "knockout": "3.4.2",
-    "knockout-transformations": "2.1.0",
     "knockout-sortable": "1.1.0",
+    "knockout-transformations": "2.1.0",
     "lozad": "1.4.0",
     "matchmedia-polyfill": "0.3.0",
     "moment": "2.22.1",
diff --git a/yarn.lock b/yarn.lock
index 3578a713e..8856171df 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -2052,6 +2052,10 @@ error-ex@^1.2.0:
   dependencies:
     is-arrayish "^0.2.1"
 
+es6-object-assign@^1.1.0:
+  version "1.1.0"
+  resolved "https://registry.yarnpkg.com/es6-object-assign/-/es6-object-assign-1.1.0.tgz#c2c3582656247c39ea107cb1e6652b6f9f24523c"
+
 es6-promise-polyfill@1.2.0:
   version "1.2.0"
   resolved "https://registry.yarnpkg.com/es6-promise-polyfill/-/es6-promise-polyfill-1.2.0.tgz#f38925f23cb3e3e8ce6cda8ff774fcebbb090cde"