diff --git a/README.md b/README.md
index 34bcc64..efb4e02 100644
--- a/README.md
+++ b/README.md
@@ -9,7 +9,7 @@ This project is a pnpm workspace monorepo:
 ```text
 apps/
   frontend/   TanStack Start app (React + Vite, port 3000)
-  backend/    Apollo Server + GraphQL API (Pothos + Prisma, port 4000)
+  backend/    Apollo Server + GraphQL API (Pothos + Prisma, port 3001)
 packages/
   db/         Prisma schema, generated client, migrations and seed
 ```
@@ -44,7 +44,7 @@ pnpm db:seed
 pnpm dev
 ```
 
-Frontend: http://localhost:3000 · GraphQL API: http://localhost:4000
+Frontend: http://localhost:3000 · GraphQL API: http://localhost:3001
 
 ### Commands
 
diff --git a/apps/frontend/src/graphql/client.ts b/apps/frontend/src/graphql/client.ts
index bcaba9a..3772097 100644
--- a/apps/frontend/src/graphql/client.ts
+++ b/apps/frontend/src/graphql/client.ts
@@ -1,4 +1,4 @@
-const GRAPHQL_URL = import.meta.env.VITE_GRAPHQL_URL ?? 'http://localhost:4000/'
+const GRAPHQL_URL = import.meta.env.VITE_GRAPHQL_URL ?? 'http://localhost:3001/'
 
 interface GraphQLResponse<T> {
   data?: T
diff --git a/apps/frontend/src/routes/demo/todos.tsx b/apps/frontend/src/routes/demo/todos.tsx
index c83ed46..695468d 100644
--- a/apps/frontend/src/routes/demo/todos.tsx
+++ b/apps/frontend/src/routes/demo/todos.tsx
@@ -85,7 +85,7 @@ function DemoTodos() {
         {isError && (
           <p className="demo-muted mb-6 text-sm">
             Failed to load todos: {error.message}. Is the GraphQL backend
-            running on http://localhost:4000?
+            running on http://localhost:3001?
           </p>
         )}
 
@@ -127,7 +127,7 @@ function DemoTodos() {
             Powered by GraphQL + Apollo Server
           </h3>
           <p className="demo-muted mb-4 text-sm">
-            The frontend queries the GraphQL backend on port 4000, which uses
+            The frontend queries the GraphQL backend on port 3001, which uses
             Prisma to talk to PostgreSQL
           </p>
           <div className="space-y-2 text-sm">