diff --git a/resources/test.edn b/resources/test.edn
index a8f258139..243058fac 100644
--- a/resources/test.edn
+++ b/resources/test.edn
@@ -9,7 +9,8 @@
  :npm-deps {:lodash "4.17.4"}
  :closure-warnings {:non-standard-jsdoc :off :global-this :off}
  :install-deps true
- :language-out :es5
+ :language-in :ecmascript-2020
+ :language-out :ecmascript-2020
  :foreign-libs
  [{:file "src/test/cljs/calculator_global.js"
    :provides ["calculator"]