diff --git a/packages/core/tsconfig.json b/packages/core/tsconfig.json
index 983aa20..bc5698f 100644
--- a/packages/core/tsconfig.json
+++ b/packages/core/tsconfig.json
@@ -1,7 +1,7 @@
 {
   "compilerOptions": {
     "target": "ES2017",
-    "lib": ["ES2017", "DOM"],
+    "lib": ["ES2019", "DOM"],
     "declaration": true,
     "baseUrl": "./src",
     "rootDir": "./src",