diff --git a/src/index.ts b/src/index.ts
index c775300..2cf3ea2 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -2,7 +2,6 @@ import path from 'path'
 import Debug from 'debug'
 import { build, InlineConfig } from 'vite'
 import type { RollupOutput, RollupWatcher, WatcherOptions } from 'rollup'
-import { getConfig, resolveConfig } from './resolveConfig'
 
 type FileObject = Cypress.FileObject
 type CypressPreprocessor = (file: FileObject) => string | Promise<string>
@@ -25,12 +24,6 @@ const cache: Record<string, string> = {}
 function vitePreprocessor(userConfigPath?: string): CypressPreprocessor {
   debug('User config path: %s', userConfigPath)
 
-  if (userConfigPath) {
-    resolveConfig(userConfigPath).then((config) => {
-      debug('Resolved user config:', config)
-    })
-  }
-
   return async (file) => {
     const { outputPath, filePath, shouldWatch } = file
     debug('Preprocessing file %s', filePath)
@@ -67,10 +60,10 @@ function vitePreprocessor(userConfigPath?: string): CypressPreprocessor {
       },
     }
 
-    const buildConfig = getConfig(defaultConfig)
-    debug('Build config for file %s:', filePath, buildConfig)
-
-    const watcher = await build(buildConfig)
+    const watcher = await build({
+      configFile: userConfigPath,
+      ...defaultConfig,
+    })
 
     if (shouldWatch && isWatcher(watcher)) {
       watcher.on('event', (event) => {
diff --git a/src/resolveConfig.ts b/src/resolveConfig.ts
deleted file mode 100644
index b8a4851..0000000
--- a/src/resolveConfig.ts
+++ /dev/null
@@ -1,26 +0,0 @@
-import {
-  loadConfigFromFile,
-  UserConfig,
-  mergeConfig,
-  InlineConfig,
-  ConfigEnv,
-} from 'vite'
-
-let resolvedUserConfig: UserConfig | undefined = undefined
-
-const configEnv: ConfigEnv = { command: 'build', mode: 'development' }
-
-export function resolveConfig(userConfigPath: string) {
-  return loadConfigFromFile(configEnv, userConfigPath).then((result) => {
-    resolvedUserConfig = result?.config
-    return resolvedUserConfig
-  })
-}
-
-export function getConfig(defaultConfig: InlineConfig) {
-  if (resolvedUserConfig) {
-    return mergeConfig(resolvedUserConfig, defaultConfig)
-  }
-
-  return defaultConfig
-}