diff --git a/package.json b/package.json
index f321b81..3213ca5 100644
--- a/package.json
+++ b/package.json
@@ -83,6 +83,7 @@
     "eslint-plugin-standard": "^4.0.0",
     "eslint-plugin-vue": "^5.2.2",
     "esm": "^3.2.14",
+    "fs-extra": "^7.0.1",
     "is-wsl": "^1.1.0",
     "jest": "^24.3.1",
     "jest-environment-jsdom": "^24.3.1",
@@ -90,7 +91,6 @@
     "jsdom": "^14.0.0",
     "lodash": "^4.17.11",
     "puppeteer-core": "^1.13.0",
-    "rimraf": "^2.6.3",
     "rollup": "^1.6.0",
     "rollup-plugin-babel": "^4.3.2",
     "rollup-plugin-commonjs": "^9.2.1",
diff --git a/test/utils/build.js b/test/utils/build.js
index 85967ec..f7ab39d 100644
--- a/test/utils/build.js
+++ b/test/utils/build.js
@@ -1,14 +1,10 @@
-import fs from 'fs'
+import fs from 'fs-extra'
 import path from 'path'
-import { promisify } from 'util'
 import { template } from 'lodash'
 import webpack from 'webpack'
 import VueLoaderPlugin from 'vue-loader/lib/plugin'
 import { createRenderer } from 'vue-server-renderer'
 
-const readFile = promisify(fs.readFile)
-const writeFile = promisify(fs.writeFile)
-
 const renderer = createRenderer()
 
 export function webpackRun(config) {
@@ -38,6 +34,10 @@ export async function buildFixture(fixture, config = {}) {
   }
 
   const webpackConfig = createWebpackConfig(config)
+  // remove old files
+  await fs.remove(webpackConfig.output.path)
+
+  // run webpack
   const webpackStats = await webpackRun(webpackConfig)
 
   // for test debugging
@@ -46,7 +46,7 @@ export async function buildFixture(fixture, config = {}) {
 
   const vueApp = await import(path.resolve(fixturePath, 'server')).then(m => m.default || m)
 
-  const templateFile = await readFile(path.resolve(fixturePath, '..', 'app.template.html'), { encoding: 'utf8' })
+  const templateFile = await fs.readFile(path.resolve(fixturePath, '..', 'app.template.html'), { encoding: 'utf8' })
   const compiled = template(templateFile, { interpolate: /{{([\s\S]+?)}}/g })
 
   const webpackAssets = webpackStats.assets.reduce((s, asset) => `${s}<script src="./${asset.name}"${asset.name.includes('chunk') ? '' : ' defer'}></script>\n`, '')
@@ -57,7 +57,7 @@ export async function buildFixture(fixture, config = {}) {
   const appFile = path.resolve(webpackStats.outputPath, 'index.html')
   const html = compiled({ app, webpackAssets, ...metaInfo })
 
-  await writeFile(appFile, html)
+  await fs.writeFile(appFile, html)
 
   return {
     url: `file://${appFile}`,
diff --git a/yarn.lock b/yarn.lock
index c9ea0fe..769e161 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -3478,6 +3478,15 @@ from2@^2.1.0:
     inherits "^2.0.1"
     readable-stream "^2.0.0"
 
+fs-extra@^7.0.1:
+  version "7.0.1"
+  resolved "https://registry.yarnpkg.com/fs-extra/-/fs-extra-7.0.1.tgz#4f189c44aa123b895f722804f55ea23eadc348e9"
+  integrity sha512-YJDaCJZEnBmcbw13fvdAM9AwNOJwOzrE4pqMqBq5nFiEqXUqHwlK4B+3pUw6JNvfSPtX05xFHtYy/1ni01eGCw==
+  dependencies:
+    graceful-fs "^4.1.2"
+    jsonfile "^4.0.0"
+    universalify "^0.1.0"
+
 fs-minipass@^1.2.5:
   version "1.2.5"
   resolved "https://registry.yarnpkg.com/fs-minipass/-/fs-minipass-1.2.5.tgz#06c277218454ec288df77ada54a03b8702aacb9d"
@@ -3606,7 +3615,7 @@ globals@^9.18.0:
   resolved "https://registry.yarnpkg.com/globals/-/globals-9.18.0.tgz#aa3896b3e69b487f17e31ed2143d69a8e30c2d8a"
   integrity sha512-S0nG3CLEQiY/ILxqtztTWH/3iRRdyBLw6KMDxnKMchrtbj2OFmehVh0WUCfW3DUrIgx/qFrJPICrq4Z4sTR9UQ==
 
-graceful-fs@^4.1.11, graceful-fs@^4.1.15, graceful-fs@^4.1.2:
+graceful-fs@^4.1.11, graceful-fs@^4.1.15, graceful-fs@^4.1.2, graceful-fs@^4.1.6:
   version "4.1.15"
   resolved "https://registry.yarnpkg.com/graceful-fs/-/graceful-fs-4.1.15.tgz#ffb703e1066e8a0eeaa4c8b80ba9253eeefbfb00"
   integrity sha512-6uHUhOPEBgQ24HM+r6b/QwWfZq+yiFcipKFrOFiBEnWdy5sdzYoi+pJeQaPI5qOLRFqWmAXUPQNsielzdLoecA==
@@ -4816,6 +4825,13 @@ json5@^2.1.0:
   dependencies:
     minimist "^1.2.0"
 
+jsonfile@^4.0.0:
+  version "4.0.0"
+  resolved "https://registry.yarnpkg.com/jsonfile/-/jsonfile-4.0.0.tgz#8771aae0799b64076b76640fca058f9c10e33ecb"
+  integrity sha1-h3Gq4HmbZAdrdmQPygWPnBDjPss=
+  optionalDependencies:
+    graceful-fs "^4.1.6"
+
 jsprim@^1.2.2:
   version "1.4.1"
   resolved "https://registry.yarnpkg.com/jsprim/-/jsprim-1.4.1.tgz#313e66bc1e5cc06e438bc1b7499c2e5c56acb6a2"
@@ -6423,7 +6439,7 @@ ret@~0.1.10:
   resolved "https://registry.yarnpkg.com/ret/-/ret-0.1.15.tgz#b8a4825d5bdb1fc3f6f53c2bc33f81388681c7bc"
   integrity sha512-TTlYpa+OL+vMMNG24xSlQGEJ3B/RzEfUlLct7b5G/ytav+wPrplCpVMFuwzXbkecJrb6IYo1iFb0S9v37754mg==
 
-rimraf@2.6.3, rimraf@^2.5.4, rimraf@^2.6.1, rimraf@^2.6.2, rimraf@^2.6.3:
+rimraf@2.6.3, rimraf@^2.5.4, rimraf@^2.6.1, rimraf@^2.6.2:
   version "2.6.3"
   resolved "https://registry.yarnpkg.com/rimraf/-/rimraf-2.6.3.tgz#b2d104fe0d8fb27cf9e0a1cda8262dd3833c6cab"
   integrity sha512-mwqeW5XsA2qAejG46gYdENaxXjx9onRNCfn7L0duuP4hCuTIi/QO7PDK07KJfp1d+izWPrzEJDcSqBa0OZQriA==
@@ -7363,6 +7379,11 @@ unist-util-visit@^1.1.0:
   dependencies:
     unist-util-visit-parents "^2.0.0"
 
+universalify@^0.1.0:
+  version "0.1.2"
+  resolved "https://registry.yarnpkg.com/universalify/-/universalify-0.1.2.tgz#b646f69be3942dabcecc9d6639c80dc105efaa66"
+  integrity sha512-rBJeI5CXAlmy1pV+617WB9J63U6XcazHHF2f2dbJix4XzpUF0RS3Zbj0FGIOCAva5P/d/GBOYaACQ1w+0azUkg==
+
 unset-value@^1.0.0:
   version "1.0.0"
   resolved "https://registry.yarnpkg.com/unset-value/-/unset-value-1.0.0.tgz#8376873f7d2335179ffb1e6fc3a8ed0dfc8ab559"