diff --git a/package.json b/package.json
index c6bc642eb..160608823 100644
--- a/package.json
+++ b/package.json
@@ -155,7 +155,7 @@
     "flow": "flow",
     "pretest": "npm run code:build",
     "test": "npm run test:unit",
-    "test:unit": "cross-env NODE_ENV=test BABEL_ENV=test TZ=UTC jest --config ./jest.config.unit.js",
+    "test:unit": "cross-env NODE_ENV=test BABEL_ENV=test TZ=UTC jest --config ./jest.config.unit.js --maxWorkers 2",
     "test:func": "cross-env NODE_ENV=testOldEnv jest --config ./test/jest.config.func.js --testPathPattern ./test/functional/index*",
     "test:e2e": "cross-env BABEL_ENV=testOldEnv jest --config ./test/jest.config.e2e.js",
     "test:all": "npm run test && npm run test:func && npm run test:e2e",