diff --git a/Dockerfile b/Dockerfile
index e93d4fc..0e67283 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -35,4 +35,4 @@ ENV __VITE_ADDITIONAL_SERVER_ALLOWED_HOSTS=jleibl.net
 ENV __VITE_ADDITIONAL_PREVIEW_ALLOWED_HOSTS=jleibl.net
 
 # Start the Astro application
-CMD ["bun", "preview", "--host"]
+CMD ["bun", "preview", "--port", "4321"]
diff --git a/astro.config.mjs b/astro.config.mjs
index 728401a..6f753cd 100644
--- a/astro.config.mjs
+++ b/astro.config.mjs
@@ -18,6 +18,12 @@ export default defineConfig({
   ],
 
   vite: {
-    plugins: [tailwindcss()]
+    plugins: [tailwindcss()],
+    server: {
+      port: 4321
+    },
+    preview: {
+      port: 4321
+    }
   }
 });
\ No newline at end of file