diff --git a/www/apps/book/app/learn/debugging-and-testing/testing-tools/page.mdx b/www/apps/book/app/learn/debugging-and-testing/testing-tools/page.mdx
index b9b39d07f1..36c8c79790 100644
--- a/www/apps/book/app/learn/debugging-and-testing/testing-tools/page.mdx
+++ b/www/apps/book/app/learn/debugging-and-testing/testing-tools/page.mdx
@@ -41,6 +41,7 @@ module.exports = {
       {
         jsc: {
           parser: { syntax: "typescript", decorators: true },
+          target: "es2021"
         },
       },
     ],