diff --git a/tsconfig.json b/tsconfig.json
index 34e85f7..2c96e48 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -1,7 +1,7 @@
 {
   "compilerOptions": {
     "allowJs": false,
-    "lib": ["es7"],
+    "lib": ["es2017"],
     "declaration": true,
     "module": "commonjs",
     "moduleResolution": "node",