diff --git a/packages/auto-id/src/certificateManager.ts b/packages/auto-id/src/certificateManager.ts
index 940f7365..1687c9db 100644
--- a/packages/auto-id/src/certificateManager.ts
+++ b/packages/auto-id/src/certificateManager.ts
@@ -13,7 +13,6 @@ import { Crypto } from '@peculiar/webcrypto'
 import * as x509 from '@peculiar/x509'
 import { KeyObject, createPublicKey } from 'crypto'
 import { doPublicKeysMatch, pemToPublicKey } from './keyManagement'
-import { randomSerialNumber } from './utils'
 
 const crypto = new Crypto()
 x509.cryptoProvider.set(crypto)
@@ -67,10 +66,6 @@ export class CertificateManager {
     return new x509.Name([[commonNameAttr]])
   }
 
-  // protected static toCommonName(subjectName: string): JsonName {
-  //   return [{ '2.5.4.3': [subjectName] }] // OID for commonName
-  // }
-
   static prettyPrintCertificate(cert: x509.X509Certificate): void {
     console.log('Certificate:')
     console.log('============')
@@ -241,7 +236,6 @@ export class CertificateManager {
     notAfter.setDate(notBefore.getDate() + validityPeriodDays)
 
     let certificateBuilder = await x509.X509CertificateGenerator.create({
-      serialNumber: randomSerialNumber().toString(),
       issuer: csr.subject,
       subject: csr.subject,
       notBefore,
diff --git a/packages/auto-id/src/utils.ts b/packages/auto-id/src/utils.ts
index b9630f1a..e7ac9a94 100644
--- a/packages/auto-id/src/utils.ts
+++ b/packages/auto-id/src/utils.ts
@@ -23,16 +23,6 @@ export function derEncodeSignatureAlgorithmOID(oid: string): Uint8Array {
   return new Uint8Array([...sequenceHeader, ...new Uint8Array(berArrayBuffer), ...nullParameter])
 }
 
-export function randomSerialNumber(): bigint {
-  // Generate 20 random bytes
-  const bytes = randomBytes(20)
-  // Convert bytes to a BigInt
-  let serial = BigInt('0x' + bytes.toString('hex'))
-  // Shift right by 1 to ensure the number is positive
-  serial = serial >> BigInt(1)
-  return serial
-}
-
 export function addDaysToCurrentDate(days: number): Date {
   const currentDate = new Date() // This gives you the current date and time
   currentDate.setUTCDate(currentDate.getUTCDate() + days) // Adds the specified number of days