diff --git a/.circleci/config.yml b/.circleci/config.yml
index d1248a5a29c..5fe9193ed54 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -317,8 +317,9 @@ jobs:
   ember-build-tests:
     docker:
       - image: *EMBER_IMAGE
+    resource_class: medium+
     environment:
-      JOBS: 2 # limit parallelism for broccoli-babel-transpiler
+      JOBS: 1 # limit parallelism for broccoli-babel-transpiler
     steps:
       - checkout
       - md5uilib