diff --git a/core/package.json b/core/package.json
index f7b25db222..1fa709997a 100644
--- a/core/package.json
+++ b/core/package.json
@@ -80,9 +80,9 @@
     "prerender.e2e": "node scripts/testing/prerender.js",
     "start": "npm run build.css && stencil build --dev --watch --serve",
     "test": "stencil test --spec --e2e --max-workers=2",
-    "test.spec": "stencil test --spec",
+    "test.spec": "stencil test --spec --max-workers=2",
     "test.spec.debug": "npx --node-arg=\"--inspect-brk\" stencil test --spec",
-    "test.e2e": "stencil test --e2e",
+    "test.e2e": "stencil test --e2e --max-workers=2",
     "test.screenshot": "stencil test --e2e --screenshot --screenshot-connector=scripts/screenshot/dev.js",
     "test.screenshot.ci": "stencil test --e2e --screenshot --screenshot-connector=scripts/screenshot/ci.js --ci",
     "test.watch": "jest --watch --no-cache",