diff --git a/.changeset/curly-crews-hide.md b/.changeset/curly-crews-hide.md
new file mode 100644
index 000000000000..631e390453fa
--- /dev/null
+++ b/.changeset/curly-crews-hide.md
@@ -0,0 +1,5 @@
+---
+"@sveltejs/adapter-vercel": patch
+---
+
+fix: updated `@default` annotation for runtime
diff --git a/packages/adapter-vercel/index.d.ts b/packages/adapter-vercel/index.d.ts
index 74aaed8cd620..ffd6ae11d40b 100644
--- a/packages/adapter-vercel/index.d.ts
+++ b/packages/adapter-vercel/index.d.ts
@@ -6,7 +6,7 @@ export default function plugin(config?: Config): Adapter;
 export interface ServerlessConfig {
 	/**
 	 * Whether to use [Edge Functions](https://vercel.com/docs/concepts/functions/edge-functions) (`'edge'`) or [Serverless Functions](https://vercel.com/docs/concepts/functions/serverless-functions) (`'nodejs18.x'`, `'nodejs20.x'` etc).
-	 * @default 'nodejs18.x'
+	 * @default Same as the build environment
 	 */
 	runtime?: `nodejs${number}.x`;
 	/**