diff --git a/bower.json b/bower.json
index 81acde661..0f8337867 100644
--- a/bower.json
+++ b/bower.json
@@ -49,7 +49,8 @@
     "jszip": "Stuk/jszip#^3.1.5",
     "requirejs-plugins": "^1.0.3",
     "dragula.js": "3.7.2",
-    "MathJax": "3.0.5"
+    "MathJax": "3.0.5",
+    "es6-promise ": "4.2.4"
   },
   "resolutions": {
     "bootstrap": "^v4.0.0",