diff --git a/packages/vite/package.json b/packages/vite/package.json
index b7375067e6308c..6f6a47c2507368 100644
--- a/packages/vite/package.json
+++ b/packages/vite/package.json
@@ -105,7 +105,7 @@
     "open": "^8.2.1",
     "periscopic": "^2.0.3",
     "postcss-import": "^14.0.2",
-    "postcss-load-config": "^3.0.0",
+    "postcss-load-config": "^3.1.0",
     "postcss-modules": "^4.2.2",
     "resolve.exports": "^1.0.2",
     "rollup-plugin-license": "^2.5.0",
diff --git a/packages/vite/src/node/server/ws.ts b/packages/vite/src/node/server/ws.ts
index eac4633210bd74..499da9a0c6668e 100644
--- a/packages/vite/src/node/server/ws.ts
+++ b/packages/vite/src/node/server/ws.ts
@@ -12,6 +12,8 @@ import { Socket } from 'net'
 export const HMR_HEADER = 'vite-hmr'
 
 export interface WebSocketServer {
+  on: WebSocket.Server['on']
+  off: WebSocket.Server['off']
   send(payload: HMRPayload): void
   close(): Promise<void>
 }
@@ -92,6 +94,8 @@ export function createWebSocketServer(
   let bufferedError: ErrorPayload | null = null
 
   return {
+    on: wss.on.bind(wss),
+    off: wss.off.bind(wss),
     send(payload: HMRPayload) {
       if (payload.type === 'error' && !wss.clients.size) {
         bufferedError = payload
diff --git a/pnpm-lock.yaml b/pnpm-lock.yaml
index 7728fb32ca4f33..af51cb263b8c02 100644
--- a/pnpm-lock.yaml
+++ b/pnpm-lock.yaml
@@ -679,7 +679,7 @@ importers:
       periscopic: ^2.0.3
       postcss: ^8.3.8
       postcss-import: ^14.0.2
-      postcss-load-config: ^3.0.0
+      postcss-load-config: ^3.1.0
       postcss-modules: ^4.2.2
       resolve: ^1.20.0
       resolve.exports: ^1.0.2