diff --git a/proxy/migrations/generateManifest.ts b/proxy/migrations/generateManifest.ts
index 095090b0a..08cd6f346 100644
--- a/proxy/migrations/generateManifest.ts
+++ b/proxy/migrations/generateManifest.ts
@@ -1,5 +1,6 @@
 import { ethers } from "hardhat";
 import { contracts, getContractKeyInAbiFile } from "./deploySchain";
+import { networkNames } from "@openzeppelin/upgrades-core";
 import { promises as fs } from "fs";
 import {
     getVersion,
@@ -134,14 +135,15 @@ export async function importAddresses(manifest: ManifestData, abi: {[ key in str
 
 export async function manifestSetup(pathToManifest: string) {
     const chainId = (await ethers.provider.getNetwork()).chainId;
-    const correctManifestPath = `.openzeppelin/unknown-${chainId}.json`;
+    const manifestName = networkNames[chainId] ?? `unknown-${chainId}`;
+    const correctManifestPath = `.openzeppelin/${manifestName}.json`;
     if (pathToManifest === "" || pathToManifest === correctManifestPath) {
-        fs.access(correctManifestPath);
+        await fs.access(correctManifestPath);
         console.log("Current Manifest file detected - will use this one");
         return;
     }
     try {
-        fs.access(correctManifestPath);
+        await fs.access(correctManifestPath);
         console.log("Current Manifest file detected - will remove it");
         try {
             await fs.unlink(correctManifestPath);
@@ -154,7 +156,7 @@ export async function manifestSetup(pathToManifest: string) {
         console.log("No current Manifest file detected");
     }
     try {
-        fs.access( pathToManifest );
+        await fs.access( pathToManifest );
         console.log("New Manifest file detected");
         try {
             await fs.copyFile( pathToManifest, correctManifestPath );
diff --git a/proxy/migrations/upgradeMainnet.ts b/proxy/migrations/upgradeMainnet.ts
index 30819c9b1..7797df38d 100644
--- a/proxy/migrations/upgradeMainnet.ts
+++ b/proxy/migrations/upgradeMainnet.ts
@@ -4,7 +4,6 @@ import { promises as fs } from "fs";
 import { AutoSubmitter, Upgrader } from "@skalenetwork/upgrade-tools";
 import { SkaleABIFile } from "@skalenetwork/upgrade-tools/dist/src/types/SkaleABIFile";
 import { contracts } from "./deployMainnet";
-import { manifestSetup } from "./generateManifest";
 import { MessageProxyForMainnet } from "../typechain";
 
 class ImaMainnetUpgrader extends Upgrader {
@@ -65,8 +64,6 @@ async function getImaMainnetAbiAndAddress(): Promise<SkaleABIFile> {
 }
 
 async function main() {
-    const pathToManifest: string = process.env.MANIFEST || "";
-    await manifestSetup(pathToManifest);
     const upgrader = new ImaMainnetUpgrader(
         "1.5.0",
         await getImaMainnetAbiAndAddress(),