diff --git a/package.json b/package.json
index 9970f4d5a..63f89c7c2 100644
--- a/package.json
+++ b/package.json
@@ -10,7 +10,7 @@
   "scripts": {
     "build": "yarn tsc",
     "setup": "./pbjs.sh && ./integration/pbjs.sh && ./integration/update-bins.sh && ./integration/codegen.sh",
-    "test": "yarn jest -c jest.config.js",
+    "test": "yarn jest -c jest.config.js --maxWorkers=2",
     "prettier": "prettier --write {src,tests}/**/*.ts",
     "prettier:check": "prettier --list-different {src,tests}/**/*.ts"
   },