diff --git a/src/http.ts b/src/http.ts
index 2277148..2ff429f 100644
--- a/src/http.ts
+++ b/src/http.ts
@@ -15,7 +15,10 @@ export async function fetchJson<T>(
   url: string | URL,
   init?: RequestInit,
 ): Promise<T> {
-  const resp = await fetch(url, init);
+  const resp = await fetch(url, {
+    ...init,
+    signal: init?.signal ?? AbortSignal.timeout(30_000),
+  });
   if (!resp.ok) throw new HttpError(what, resp.status, await resp.text());
   return resp.json() as Promise<T>;
 }