diff --git a/scripts/db-populate-nip05.ts b/scripts/db-populate-nip05.ts
index c22c0c12..48e792f6 100644
--- a/scripts/db-populate-nip05.ts
+++ b/scripts/db-populate-nip05.ts
@@ -1,3 +1,4 @@
+import { Semaphore } from '@lambdalisue/async';
 import { NSchema as n } from '@nostrify/nostrify';
 
 import { Storages } from '@/storages.ts';
@@ -5,6 +6,7 @@ import { faviconCache } from '@/utils/favicon.ts';
 import { nip05Cache } from '@/utils/nip05.ts';
 
 const kysely = await Storages.kysely();
+const sem = new Semaphore(5);
 
 const query = kysely
   .selectFrom('nostr_events')
@@ -12,31 +14,37 @@ const query = kysely
   .where('kind', '=', 0);
 
 for await (const { content } of query.stream(100)) {
-  const signal = AbortSignal.timeout(30_000); // generous timeout
-
-  // Parse metadata.
-  const metadata = n.json().pipe(n.metadata()).catch({}).safeParse(content);
-  if (!metadata.success) continue;
-
-  // Update nip05.
-  const { nip05 } = metadata.data;
-  if (nip05) {
-    try {
-      await nip05Cache.fetch(nip05, { signal });
-    } catch {
-      // Ignore.
-    }
+  while (sem.locked) {
+    await new Promise((resolve) => setTimeout(resolve, 0));
   }
 
-  // Update favicon.
-  const domain = nip05?.split('@')[1].toLowerCase();
-  if (domain) {
-    try {
-      await faviconCache.fetch(domain, { signal });
-    } catch {
-      // Ignore.
+  sem.lock(async () => {
+    const signal = AbortSignal.timeout(30_000); // generous timeout
+
+    // Parse metadata.
+    const metadata = n.json().pipe(n.metadata()).catch({}).safeParse(content);
+    if (!metadata.success) return;
+
+    // Update nip05.
+    const { nip05 } = metadata.data;
+    if (nip05) {
+      try {
+        await nip05Cache.fetch(nip05, { signal });
+      } catch {
+        // Ignore.
+      }
     }
-  }
+
+    // Update favicon.
+    const domain = nip05?.split('@')[1].toLowerCase();
+    if (domain) {
+      try {
+        await faviconCache.fetch(domain, { signal });
+      } catch {
+        // Ignore.
+      }
+    }
+  });
 }
 
 Deno.exit();