diff --git a/packages/vitest/package.json b/packages/vitest/package.json
index 253b99bfff13..e3bacd409bd9 100644
--- a/packages/vitest/package.json
+++ b/packages/vitest/package.json
@@ -88,7 +88,7 @@
     "chai": "^4.3.6",
     "debug": "^4.3.4",
     "local-pkg": "^0.4.1",
-    "tinypool": "^0.1.3",
+    "tinypool": "^0.2.1",
     "tinyspy": "^0.3.3",
     "vite": "^2.9.12"
   },
diff --git a/packages/vitest/src/node/pool.ts b/packages/vitest/src/node/pool.ts
index c99936535f49..227d745b8336 100644
--- a/packages/vitest/src/node/pool.ts
+++ b/packages/vitest/src/node/pool.ts
@@ -76,7 +76,6 @@ export function createPool(ctx: Vitest): WorkerPool {
         files,
         invalidates,
         workerId,
-        poolId: !ctx.config.threads ? 1 : ((workerId - 1) % maxThreads) + 1,
       }
       try {
         await pool.run(data, { transferList: [workerPort], name })
diff --git a/packages/vitest/src/runtime/worker.ts b/packages/vitest/src/runtime/worker.ts
index d3b0da3d5f20..4d3c463b70a0 100644
--- a/packages/vitest/src/runtime/worker.ts
+++ b/packages/vitest/src/runtime/worker.ts
@@ -1,5 +1,6 @@
 import { resolve } from 'pathe'
 import { createBirpc } from 'birpc'
+import { workerId as poolId } from 'tinypool'
 import { ModuleCacheMap } from 'vite-node/client'
 import type { ResolvedConfig, WorkerContext, WorkerRPC } from '../types'
 import { distDir } from '../constants'
@@ -63,7 +64,7 @@ function init(ctx: WorkerContext) {
   if (typeof __vitest_worker__ !== 'undefined' && ctx.config.threads && ctx.config.isolate)
     throw new Error(`worker for ${ctx.files.join(',')} already initialized by ${getWorkerState().ctx.files.join(',')}. This is probably an internal bug of Vitest.`)
 
-  const { config, port, workerId, poolId } = ctx
+  const { config, port, workerId } = ctx
 
   process.env.VITEST_WORKER_ID = String(workerId)
   process.env.VITEST_POOL_ID = String(poolId)
diff --git a/packages/vitest/src/types/worker.ts b/packages/vitest/src/types/worker.ts
index 1ff9e70c0fac..24f5ed1b4dd3 100644
--- a/packages/vitest/src/types/worker.ts
+++ b/packages/vitest/src/types/worker.ts
@@ -9,7 +9,6 @@ import type { UserConsoleLog } from './general'
 
 export interface WorkerContext {
   workerId: number
-  poolId: number
   port: MessagePort
   config: ResolvedConfig
   files: string[]
diff --git a/pnpm-lock.yaml b/pnpm-lock.yaml
index 8de30507a22a..9edd404c6508 100644
--- a/pnpm-lock.yaml
+++ b/pnpm-lock.yaml
@@ -685,7 +685,7 @@ importers:
       rollup: ^2.75.7
       source-map-js: ^1.0.2
       strip-ansi: ^7.0.1
-      tinypool: ^0.1.3
+      tinypool: ^0.2.1
       tinyspy: ^0.3.3
       typescript: ^4.7.4
       vite: ^2.9.10
@@ -698,7 +698,7 @@ importers:
       chai: 4.3.6
       debug: 4.3.4
       local-pkg: 0.4.1
-      tinypool: 0.1.3
+      tinypool: 0.2.1
       tinyspy: 0.3.3
       vite: 2.9.10
     devDependencies:
@@ -19491,8 +19491,8 @@ packages:
       setimmediate: 1.0.5
     dev: true
 
-  /tinypool/0.1.3:
-    resolution: {integrity: sha512-2IfcQh7CP46XGWGGbdyO4pjcKqsmVqFAPcXfPxcPXmOWt9cYkTP9HcDmGgsfijYoAEc4z9qcpM/BaBz46Y9/CQ==}
+  /tinypool/0.2.1:
+    resolution: {integrity: sha512-HFU5ZYVq3wBfhSaf8qdqGsneaqXm0FgJQpoUlJbVdHpRLzm77IneKAD3RjzJWZvIv0YpPB9S7LUW53f6BE6ZSg==}
     engines: {node: '>=14.0.0'}
     dev: false