diff --git a/packages/reactivity/__tests__/gc.spec.ts b/packages/reactivity/__tests__/gc.spec.ts
index 953765dd1d9..76841d2a8ff 100644
--- a/packages/reactivity/__tests__/gc.spec.ts
+++ b/packages/reactivity/__tests__/gc.spec.ts
@@ -21,6 +21,7 @@ describe.skipIf(!global.gc)('reactivity/gc', () => {
   // #9233
   it('should release computed cache', async () => {
     const src = ref<{} | undefined>({})
+    // @ts-expect-error ES2021 API
     const srcRef = new WeakRef(src.value!)
 
     let c: ComputedRef | undefined = computed(() => src.value)
diff --git a/tsconfig.json b/tsconfig.json
index f47b7fc8eb9..6ba420775f7 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -18,7 +18,7 @@
     "esModuleInterop": true,
     "removeComments": false,
     "jsx": "preserve",
-    "lib": ["esnext", "dom"],
+    "lib": ["es2016", "dom"],
     "types": ["vitest/globals", "puppeteer", "node"],
     "rootDir": ".",
     "paths": {