diff --git a/Dockerfile.dev b/Dockerfile.dev
index 4b4d9bc..9fbf2f3 100644
--- a/Dockerfile.dev
+++ b/Dockerfile.dev
@@ -91,6 +91,6 @@ EOF
 
 RUN chmod +x /start.sh
 
-EXPOSE 8000 5173
+EXPOSE 8000 5174
 
 CMD ["/start.sh"]
diff --git a/docker/dev/docker-compose.yml b/docker/dev/docker-compose.yml
index 4334a19..fb744c4 100644
--- a/docker/dev/docker-compose.yml
+++ b/docker/dev/docker-compose.yml
@@ -14,7 +14,7 @@ services:
     restart: unless-stopped
     ports:
       - "8001:8000"
-      - "5174:5173"
+      - "5174:5174"
     volumes:
       - ../..:/app
     environment:
diff --git a/vite.config.js b/vite.config.js
index bb886e6..90c3ccc 100644
--- a/vite.config.js
+++ b/vite.config.js
@@ -23,6 +23,16 @@ export default defineConfig({
     ],
     server: {
         cors: true,
+        // Bind all interfaces so the port mapping reaches it; the container's
+        // own loopback is not addressable from the host browser. Port matches
+        // the compose mapping so the URL written to public/hot is reachable.
+        host: '0.0.0.0',
+        port: 5174,
+        strictPort: true,
+        hmr: {
+            host: 'localhost',
+            clientPort: 5174,
+        },
         watch: {
             ignored: [
                 '**/.agents/**',