diff --git a/src/client/client.ts b/src/client/client.ts
index 7338aa3..7efcac4 100644
--- a/src/client/client.ts
+++ b/src/client/client.ts
@@ -3,6 +3,7 @@ import { IProver, IVerifyingProviderConstructor } from "#interfaces.js";
 import { IClientVerifyingProvider } from "#client/verifyingProvider.js";
 import { LightClientUpdate } from "#types.js";
 import { computeSyncPeriodAtSlot } from "@lodestar/light-client/utils";
+import {init} from "@chainsafe/bls/switchable.js";
 
 interface Config extends BaseClientOptions {
   prover: IProver;
@@ -53,6 +54,7 @@ export default class Client extends BaseClient {
     if (this._latestPeriod + 1 === this.getCurrentPeriod()) {
       this.booted = true;
       this.emit("synced");
+      await init("herumi");
 
       await this.getLatestExecution(false);
     } else {