diff --git a/package.json b/package.json
index a9cf81b..137e543 100644
--- a/package.json
+++ b/package.json
@@ -5,7 +5,7 @@
   "license": "MIT",
   "scripts": {
     "dev": "NODE_ENV=development tsx server/index.ts",
-    "build": "cd client && npm install && npm run build",
+    "build": "cd client && rm -rf node_modules package-lock.json && npm install && npm run build",
     "build:client": "cd client && npm run build",
     "build:server": "esbuild server/index.ts --platform=node --packages=external --bundle --format=esm --outdir=dist",
     "start": "NODE_ENV=production node dist/index.js",
diff --git a/vercel.json b/vercel.json
index 094a187..a1d81e7 100644
--- a/vercel.json
+++ b/vercel.json
@@ -1,7 +1,8 @@
 {
   "version": 2,
-  "buildCommand": "npm run build",
+  "buildCommand": "npm ci && npm run build",
   "outputDirectory": "client/dist",
+  "installCommand": "npm ci",
   "functions": {
     "api/index.ts": {
       "maxDuration": 30