diff --git a/tsconfig.json b/tsconfig.json
index 56ed6a8..b0b6347 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -17,8 +17,7 @@
     },
     "target": "es5",
     "lib": [
-      "es2016",
-      "es2019"
+      "es2016"
     ],
     "sourceMap": true,
     "declaration": true