diff --git a/tsconfig.back.json b/tsconfig.back.json
index c977de1f..40011037 100644
--- a/tsconfig.back.json
+++ b/tsconfig.back.json
@@ -1,7 +1,7 @@
 {
   "compilerOptions": {
     "target": "es2017",
-    "lib": ["es2017", "esnext.asynciterable", "DOM"],
+    "lib": ["es2021", "esnext.asynciterable", "DOM"],
     "typeRoots": [
       "./node_modules/@types",
       "./src/types",