diff --git a/compiler/forget/packages/playground/tsconfig.json b/compiler/forget/packages/playground/tsconfig.json
index b25c4f834c..55d0b209b9 100644
--- a/compiler/forget/packages/playground/tsconfig.json
+++ b/compiler/forget/packages/playground/tsconfig.json
@@ -1,6 +1,6 @@
 {
   "compilerOptions": {
-    "target": "es5",
+    "target": "ES2015",
     "lib": [
       "dom",
       "dom.iterable",