diff --git a/test/EthVault.register.spec.ts b/test/EthVault.register.spec.ts
index 7a26f475..ce39305f 100644
--- a/test/EthVault.register.spec.ts
+++ b/test/EthVault.register.spec.ts
@@ -28,6 +28,7 @@ import { signTypedData, SignTypedDataVersion } from '@metamask/eth-sig-util'
 
 const gwei = 1000000000n
 const uintSerializer = new UintNumberType(8)
+const privateKey = '0x7c93e5f6928cb70e47ef96e9e800fc320efdaf7d4114ce84ab7c7679796e5973'
 
 describe('EthVault - register', () => {
   const validatorDeposit = ethers.parseEther('32')
@@ -199,7 +200,8 @@ describe('EthVault - register', () => {
 
     it('succeeds using validators manager signature', async () => {
       const index = await validatorsRegistry.get_deposit_count()
-      const manager = Wallet.createRandom()
+      const manager = new ethers.Wallet(privateKey)
+      console.log(manager.privateKey)
       await vault.connect(admin).setValidatorsManager(await manager.getAddress())
       const signingData = await getValidatorsManagerSigningData(
         approvalParams.validators,
@@ -464,7 +466,7 @@ describe('EthVault - register', () => {
     })
 
     it('succeeds using validators manager signature', async () => {
-      const manager = Wallet.createRandom()
+      const manager = new ethers.Wallet(privateKey)
       await vault.connect(admin).setValidatorsManager(await manager.getAddress())
       const signingData = await getValidatorsManagerSigningData(
         approvalParams.validators,
diff --git a/test/__snapshots__/EthVault.register.spec.ts.snap b/test/__snapshots__/EthVault.register.spec.ts.snap
index 4f35aafc..2b9ade80 100644
--- a/test/__snapshots__/EthVault.register.spec.ts.snap
+++ b/test/__snapshots__/EthVault.register.spec.ts.snap
@@ -10,7 +10,7 @@ Object {
 exports[`EthVault - register multiple validators succeeds using validators manager signature 1`] = `
 Object {
   "calldataByteLength": 2692,
-  "gasUsed": 639910,
+  "gasUsed": 639922,
 }
 `;
 
@@ -24,6 +24,6 @@ Object {
 exports[`EthVault - register single validator succeeds using validators manager signature 1`] = `
 Object {
   "calldataByteLength": 1124,
-  "gasUsed": 306643,
+  "gasUsed": 306667,
 }
 `;