diff --git a/src/node/build/buildPluginCss.ts b/src/node/build/buildPluginCss.ts
index ddcc3f95fcc52f..5b1e8871a69c63 100644
--- a/src/node/build/buildPluginCss.ts
+++ b/src/node/build/buildPluginCss.ts
@@ -8,6 +8,7 @@ import {
   parseWithQuery
 } from '../utils'
 import { Transform } from '../config'
+import hash_sum from 'hash-sum'
 
 const debug = require('debug')('vite:build:css')
 
@@ -17,7 +18,6 @@ export const createBuildCssPlugin = (
   root: string,
   publicBase: string,
   assetsDir: string,
-  cssFileName: string,
   minify: boolean,
   inlineLimit: number,
   transforms: Transform[]
@@ -127,6 +127,8 @@ export const createBuildCssPlugin = (
         ).css
       }
 
+      const cssFileName = `style.${hash_sum(css)}.css`
+
       bundle[cssFileName] = {
         isAsset: true,
         type: 'asset',
diff --git a/src/node/build/index.ts b/src/node/build/index.ts
index 03cbdec9cd795b..ddb4fa358eab4e 100644
--- a/src/node/build/index.ts
+++ b/src/node/build/index.ts
@@ -139,7 +139,7 @@ export async function build(options: BuildConfig = {}): Promise<BuildResult> {
     root = process.cwd(),
     base = '/',
     outDir = path.resolve(root, 'dist'),
-    assetsDir = 'assets',
+    assetsDir = '_assets',
     assetsInlineLimit = 4096,
     alias = {},
     transforms = [],
@@ -168,7 +168,6 @@ export async function build(options: BuildConfig = {}): Promise<BuildResult> {
   const indexPath = path.resolve(root, 'index.html')
   const publicBasePath = base.replace(/([^/])$/, '$1/') // ensure ending slash
   const resolvedAssetsPath = path.join(outDir, assetsDir)
-  const cssFileName = 'style.css'
 
   const resolver = createResolver(root, resolvers, alias)
 
@@ -219,7 +218,6 @@ export async function build(options: BuildConfig = {}): Promise<BuildResult> {
         root,
         publicBasePath,
         assetsDir,
-        cssFileName,
         !!minify,
         assetsInlineLimit,
         transforms
@@ -244,11 +242,16 @@ export async function build(options: BuildConfig = {}): Promise<BuildResult> {
   const { output } = await bundle.generate({
     format: 'es',
     sourcemap,
+    entryFileNames: `[name].[hash].js`,
+    chunkFileNames: `common.[hash].js`,
     ...rollupOutputOptions
   })
 
   spinner && spinner.stop()
 
+  const cssFileName = output.find(
+    (a) => a.type === 'asset' && a.fileName.endsWith('.css')
+  )!.fileName
   const indexHtml = emitIndex ? renderIndex(output, cssFileName) : ''
 
   if (write) {
diff --git a/src/node/config.ts b/src/node/config.ts
index 648ccea3d2776b..e8dec4288121e1 100644
--- a/src/node/config.ts
+++ b/src/node/config.ts
@@ -92,7 +92,7 @@ export interface BuildConfig extends SharedConfig {
   /**
    * Directory relative from `outDir` where the built js/css/image assets will
    * be placed.
-   * @default 'assets'
+   * @default '_assets'
    */
   assetsDir?: string
   /**
diff --git a/test/test.js b/test/test.js
index b603e99cb11674..e7d4c58bb1fe48 100644
--- a/test/test.js
+++ b/test/test.js
@@ -82,7 +82,7 @@ describe('vite', () => {
       expect(await getText('.asset-import')).toMatch(
         isBuild
           ? // hashed in production
-            /\/assets\/testAssets\.([\w\d]+)\.png$/
+            /\/_assets\/testAssets\.([\w\d]+)\.png$/
           : // only resolved to absolute in dev
             '/testAssets.png'
       )