diff --git a/packages/executor/src/modules/eth.ts b/packages/executor/src/modules/eth.ts
index 417b729e..32b3859a 100644
--- a/packages/executor/src/modules/eth.ts
+++ b/packages/executor/src/modules/eth.ts
@@ -114,7 +114,7 @@ export class Eth {
             entryPoint,
             userOp,
             blockNumber.toString(),
-            serializeMempoolId(canonicalMempoolId)
+            canonicalMempoolId
           );
           this.metrics?.useropsSent?.inc();
         }
diff --git a/packages/node/src/api/publishVerifiedUserOperation.ts b/packages/node/src/api/publishVerifiedUserOperation.ts
index 122d7232..22073f64 100644
--- a/packages/node/src/api/publishVerifiedUserOperation.ts
+++ b/packages/node/src/api/publishVerifiedUserOperation.ts
@@ -4,7 +4,7 @@ import { NodeAPIModules } from "./types";
 export default function api(modules: NodeAPIModules) {
   return async function publishVerifiedUserOperation(
     userOp: ts.VerifiedUserOperation,
-    mempool: Uint8Array
+    mempool: string
   ): Promise<void> {
     await modules.network.publishVerifiedUserOperation(userOp, mempool);
   };
diff --git a/packages/node/src/api/publishVerifiedUserOperationJSON.ts b/packages/node/src/api/publishVerifiedUserOperationJSON.ts
index face33a6..36188fee 100644
--- a/packages/node/src/api/publishVerifiedUserOperationJSON.ts
+++ b/packages/node/src/api/publishVerifiedUserOperationJSON.ts
@@ -7,7 +7,7 @@ export default function api(modules: NodeAPIModules) {
     entryPoint: string,
     userOp: UserOperationStruct,
     blockHash: string,
-    mempool: Uint8Array
+    mempool: string
   ): Promise<void> {
     const VerifiedUserOperation = toVerifiedUserOperation(
       entryPoint,
diff --git a/packages/node/src/network/gossip/handler.ts b/packages/node/src/network/gossip/handler.ts
index 40790c10..e8f9f605 100644
--- a/packages/node/src/network/gossip/handler.ts
+++ b/packages/node/src/network/gossip/handler.ts
@@ -107,13 +107,13 @@ export class BundlerGossipsub extends GossipSub {
 
   async publishVerifiedUserOperation(
     userOpsWithEP: ts.VerifiedUserOperation,
-    mempool: Uint8Array
+    mempool: string
   ): Promise<void> {
     // eslint-disable-next-line @typescript-eslint/no-non-null-assertion
     await this.publishObject<GossipType.user_operations>(
       {
         type: GossipType.user_operations,
-        mempool: deserializeMempoolId(mempool),
+        mempool: mempool,
       },
       userOpsWithEP
     );
diff --git a/packages/node/src/network/interface.ts b/packages/node/src/network/interface.ts
index 8e31b50b..bd3f3bb2 100644
--- a/packages/node/src/network/interface.ts
+++ b/packages/node/src/network/interface.ts
@@ -36,7 +36,7 @@ export interface INetwork {
   /* List of p2p functions supported by Bundler */
   publishVerifiedUserOperation(
     userOp: ts.VerifiedUserOperation,
-    mempool: Uint8Array
+    mempool: string
   ): Promise<void>;
   pooledUserOpHashes(
     peerId: PeerId,
diff --git a/packages/node/src/network/network.ts b/packages/node/src/network/network.ts
index 2d1bc89e..32124b70 100644
--- a/packages/node/src/network/network.ts
+++ b/packages/node/src/network/network.ts
@@ -258,7 +258,7 @@ export class Network implements INetwork {
   /* List of p2p functions supported by Bundler */
   async publishVerifiedUserOperation(
     userOp: ts.VerifiedUserOperation,
-    mempool: Uint8Array
+    mempool: string
   ): Promise<void> {
     await this.gossip.publishVerifiedUserOperation(userOp, mempool);
   }
diff --git a/packages/types/src/node/api.ts b/packages/types/src/node/api.ts
index c4f71f64..9e89dedf 100644
--- a/packages/types/src/node/api.ts
+++ b/packages/types/src/node/api.ts
@@ -4,12 +4,12 @@ import { UserOperationStruct } from "../executor/contracts/EntryPoint";
 export interface INodeAPI {
   publishVerifiedUserOperation(
     userOpWithEP: ts.VerifiedUserOperation,
-    mempool: Uint8Array
+    mempool: string
   ): Promise<void>;
   publishVerifiedUserOperationJSON(
     entryPoint: string,
     userOp: UserOperationStruct,
     blockHash: string,
-    mempool: Uint8Array
+    mempool: string
   ): Promise<void>;
 }