diff --git a/src/browser/tsconfig.json b/src/browser/tsconfig.json
index 74b4c057..9a57c59b 100644
--- a/src/browser/tsconfig.json
+++ b/src/browser/tsconfig.json
@@ -3,7 +3,7 @@
   "compilerOptions": {
     "lib": [
       "dom",
-      "es2015",
+      "es2017"
     ],
     "outDir": "../../out",
     "types": [