diff --git a/.circleci/config.yml b/.circleci/config.yml
index 4614432..f5de002 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -8,7 +8,7 @@ version: 2
 .test: &test
   run:
     name: "Test"
-    command: npm run coverage
+    command: npm run coverage -- --maxWorkers=4
 
 .store_version: &store_version
   run: