diff --git a/ava.config.js b/ava.config.js
index 353e165..602dfd8 100644
--- a/ava.config.js
+++ b/ava.config.js
@@ -2,6 +2,5 @@ import avaConfig from '@ehmicky/dev-tasks/ava.config.js'
 
 export default {
   ...avaConfig,
-  // CI tests on Windows fail due to the amount of parallel tests otherwise
-  concurrency: 1,
+  workerThreads: true,
 }
diff --git a/src/converters.test.js b/src/converters.test.js
index 6736147..09d2202 100644
--- a/src/converters.test.js
+++ b/src/converters.test.js
@@ -30,8 +30,7 @@ each(TYPES, VALID_FULL_DATA, ({ title }, otherType, arg) => {
     return
   }
 
-  // Serial, else this test file crashes due to too many tests in parallel
-  test.serial(`convert (idempotence) | ${title}`, (t) => {
+  test(`convert (idempotence) | ${title}`, (t) => {
     t.deepEqual(normalize(arg), convert[type](convert[otherType](arg)))
   })
 })