diff --git a/src/utils.ts b/src/utils.ts
index f5a3c4c..9d49d76 100644
--- a/src/utils.ts
+++ b/src/utils.ts
@@ -1,6 +1,9 @@
 import { SignedRegistryEntry } from "./types.js";
 import * as ed from "@noble/ed25519";
 import b4a from "b4a";
+import { sha512 } from "@noble/hashes/sha512";
+
+ed.utils.sha512Sync = (...m) => sha512(ed.utils.concatBytes(...m));
 
 export function verifyEntry(entry: SignedRegistryEntry) {
   return ed.sync.verify(entry.signature, createSignatureData(entry), entry.pk);