diff --git a/templates/package-builder/tsconfig.json b/templates/package-builder/tsconfig.json
index 46ea163..9f7bcae 100644
--- a/templates/package-builder/tsconfig.json
+++ b/templates/package-builder/tsconfig.json
@@ -4,7 +4,7 @@
     "target": "es5",
     "outDir": "tmp",
     "sourceMap": false,
-    "lib": ["es6"]
+    "lib": ["es5"]
   },
   "exclude": [
       "node_modules",