diff --git a/packages/webpack/src/utils/config.ts b/packages/webpack/src/utils/config.ts
index 5245599fc5..436c3c6429 100644
--- a/packages/webpack/src/utils/config.ts
+++ b/packages/webpack/src/utils/config.ts
@@ -57,27 +57,6 @@ export function fileName (ctx: WebpackConfigContext, key: string) {
 }
 
 export function getWebpackConfig (ctx: WebpackConfigContext): Configuration {
-  // @ts-expect-error TODO: remove support for `build.extend` in v3.6
-  const { extend } = ctx.options.build
-  if (typeof extend === 'function') {
-    logger.warn('[nuxt] The `build.extend` and `webpack.build.extend` properties have been deprecated in Nuxt 3 for some time and will be removed in a future minor release. Instead, you can extend webpack config using the `webpack:config` hook.')
-
-    const extendedConfig = extend.call(
-      {},
-      ctx.config,
-      { loaders: [], ...ctx }
-    ) || ctx.config
-
-    const pragma = /@|#/
-    const { devtool } = extendedConfig
-    if (typeof devtool === 'string' && pragma.test(devtool)) {
-      extendedConfig.devtool = devtool.replace(pragma, '')
-      logger.warn(`devtool has been normalized to ${extendedConfig.devtool} as webpack documented value`)
-    }
-
-    return extendedConfig
-  }
-
   // Clone deep avoid leaking config between Client and Server
   return cloneDeep(ctx.config)
 }