diff --git a/app/lib/substack.ts b/app/lib/substack.ts
index f745095..4398f54 100644
--- a/app/lib/substack.ts
+++ b/app/lib/substack.ts
@@ -5,10 +5,13 @@ export type SubstackPost = {
   description: string;
 };
 
-const FEEDS = [
-  "https://substack.com/@kaiiiichen/feed",
-  "https://kaiiiichen.substack.com/feed",
-];
+// `https://substack.com/@<user>/feed` started returning 404 (it serves the
+// generic discover HTML page now), so we hit the publication feed directly.
+const FEEDS = ["https://kaiiiichen.substack.com/feed"];
+
+// Refetch the RSS feed every 10 minutes so newly-published posts appear on the
+// homepage within ~10 min instead of the previous 1 h window.
+const REVALIDATE_SECONDS = 600;
 
 function extractTag(xml: string, tag: string): string {
   const cdataMatch = new RegExp(`<${tag}[^>]*><!\\[CDATA\\[([\\s\\S]*?)\\]\\]><\\/${tag}>`, "i").exec(xml);
@@ -34,7 +37,7 @@ export async function getSubstackPosts(): Promise<SubstackPost[]> {
   for (const feed of FEEDS) {
     try {
       const res = await fetch(feed, {
-        next: { revalidate: 3600 },
+        next: { revalidate: REVALIDATE_SECONDS },
         headers: { "User-Agent": "kaichen.dev/1.0" },
       });
       if (!res.ok) continue;