diff --git a/upgrade/upgradePessimistic/upgradePessimistic.ts b/upgrade/upgradePessimistic/upgradePessimistic.ts
new file mode 100644
index 00000000..8157cb1a
--- /dev/null
+++ b/upgrade/upgradePessimistic/upgradePessimistic.ts
@@ -0,0 +1,183 @@
+/* eslint-disable no-await-in-loop, no-use-before-define, no-lonely-if */
+/* eslint-disable no-console, no-inner-declarations, no-undef, import/no-unresolved */
+import {expect} from "chai";
+import path = require("path");
+import fs = require("fs");
+
+import * as dotenv from "dotenv";
+dotenv.config({path: path.resolve(__dirname, "../../.env")});
+import {ethers, upgrades} from "hardhat";
+import {PolygonRollupManager, PolygonZkEVM} from "../../typechain-types";
+
+const pathOutputJson = path.join(__dirname, "./upgrade_output.json");
+
+const upgradeParameters = require("./upgrade_parameters.json");
+
+async function main() {
+    upgrades.silenceWarnings();
+
+    /*
+     * Check upgrade parameters
+     * Check that every necessary parameter is fullfilled
+     */
+    const mandatoryUpgradeParameters = ["rollupManagerAddress", "timelockDelay"];
+
+    for (const parameterName of mandatoryUpgradeParameters) {
+        if (upgradeParameters[parameterName] === undefined || upgradeParameters[parameterName] === "") {
+            throw new Error(`Missing parameter: ${parameterName}`);
+        }
+    }
+    const {rollupManagerAddress, timelockDelay} = upgradeParameters;
+    const salt = upgradeParameters.timelockSalt || ethers.ZeroHash;
+
+    // Load onchain parameters
+    const polygonRMFactory = await ethers.getContractFactory("PolygonRollupManagerPrevious");
+    const polygonRMContract = (await polygonRMFactory.attach(rollupManagerAddress)) as PolygonRollupManager;
+
+    const globalExitRootManagerAddress = await polygonRMContract.globalExitRootManager();
+    const polAddress = await polygonRMContract.pol();
+    const bridgeAddress = await polygonRMContract.bridgeAddress();
+
+    // Load provider
+    let currentProvider = ethers.provider;
+    if (upgradeParameters.multiplierGas || upgradeParameters.maxFeePerGas) {
+        if (process.env.HARDHAT_NETWORK !== "hardhat") {
+            currentProvider = ethers.getDefaultProvider(
+                `https://${process.env.HARDHAT_NETWORK}.infura.io/v3/${process.env.INFURA_PROJECT_ID}`
+            ) as any;
+            if (upgradeParameters.maxPriorityFeePerGas && upgradeParameters.maxFeePerGas) {
+                console.log(
+                    `Hardcoded gas used: MaxPriority${upgradeParameters.maxPriorityFeePerGas} gwei, MaxFee${upgradeParameters.maxFeePerGas} gwei`
+                );
+                const FEE_DATA = new ethers.FeeData(
+                    null,
+                    ethers.parseUnits(upgradeParameters.maxFeePerGas, "gwei"),
+                    ethers.parseUnits(upgradeParameters.maxPriorityFeePerGas, "gwei")
+                );
+
+                currentProvider.getFeeData = async () => FEE_DATA;
+            } else {
+                console.log("Multiplier gas used: ", upgradeParameters.multiplierGas);
+                async function overrideFeeData() {
+                    const feedata = await ethers.provider.getFeeData();
+                    return new ethers.FeeData(
+                        null,
+                        ((feedata.maxFeePerGas as bigint) * BigInt(upgradeParameters.multiplierGas)) / 1000n,
+                        ((feedata.maxPriorityFeePerGas as bigint) * BigInt(upgradeParameters.multiplierGas)) / 1000n
+                    );
+                }
+                currentProvider.getFeeData = overrideFeeData;
+            }
+        }
+    }
+
+    // Load deployer
+    let deployer;
+    if (upgradeParameters.deployerPvtKey) {
+        deployer = new ethers.Wallet(upgradeParameters.deployerPvtKey, currentProvider);
+    } else if (process.env.MNEMONIC) {
+        deployer = ethers.HDNodeWallet.fromMnemonic(
+            ethers.Mnemonic.fromPhrase(process.env.MNEMONIC),
+            "m/44'/60'/0'/0/0"
+        ).connect(currentProvider);
+    } else {
+        [deployer] = await ethers.getSigners();
+    }
+
+    console.log("deploying with: ", deployer.address);
+
+    const proxyAdmin = await upgrades.admin.getInstance();
+
+    // Assert correct admin
+    expect(await upgrades.erc1967.getAdminAddress(rollupManagerAddress as string)).to.be.equal(proxyAdmin.target);
+
+    const timelockAddress = await proxyAdmin.owner();
+
+    // load timelock
+    const timelockContractFactory = await ethers.getContractFactory("PolygonZkEVMTimelock", deployer);
+
+    // prapare upgrades
+
+    // Upgrade to rollup manager
+    const PolygonRollupManagerFactory = await ethers.getContractFactory("PolygonRollupManager");
+
+    const implRollupManager = await upgrades.prepareUpgrade(rollupManagerAddress, PolygonRollupManagerFactory, {
+        constructorArgs: [globalExitRootManagerAddress, polAddress, bridgeAddress],
+        unsafeAllow: ["constructor", "state-variable-immutable", "enum-definition", "struct-definition"],
+        unsafeAllowRenames: true,
+        unsafeAllowCustomTypes: true,
+        unsafeSkipStorageCheck: true,
+    });
+
+    console.log("#######################\n");
+    console.log(`Polygon rollup manager: ${implRollupManager}`);
+
+    console.log("you can verify the new impl address with:");
+    console.log(
+        `npx hardhat verify --constructor-args upgrade/arguments.js ${implRollupManager} --network ${process.env.HARDHAT_NETWORK}\n`
+    );
+    console.log("Copy the following constructor arguments on: upgrade/arguments.js \n", [
+        globalExitRootManagerAddress,
+        polAddress,
+        bridgeAddress,
+    ]);
+
+    const operationRollupManager = genOperation(
+        proxyAdmin.target,
+        0, // value
+        proxyAdmin.interface.encodeFunctionData("upgrade", [rollupManagerAddress, implRollupManager]),
+        ethers.ZeroHash, // predecesoor
+        salt // salt
+    );
+
+    // Schedule operation
+    const scheduleData = timelockContractFactory.interface.encodeFunctionData("schedule", [
+        operationRollupManager.target,
+        operationRollupManager.value,
+        operationRollupManager.data,
+        ethers.ZeroHash, // predecesoor
+        salt, // salt
+        timelockDelay,
+    ]);
+
+    // Execute operation
+    const executeData = timelockContractFactory.interface.encodeFunctionData("execute", [
+        operationRollupManager.target,
+        operationRollupManager.value,
+        operationRollupManager.data,
+        ethers.ZeroHash, // predecesoor
+        salt, // salt
+    ]);
+
+    console.log({scheduleData});
+    console.log({executeData});
+
+    const outputJson = {
+        scheduleData,
+        executeData,
+        timelockContractAdress: timelockAddress,
+    };
+    fs.writeFileSync(pathOutputJson, JSON.stringify(outputJson, null, 1));
+}
+
+main().catch((e) => {
+    console.error(e);
+    process.exit(1);
+});
+
+// OZ test functions
+function genOperation(target: any, value: any, data: any, predecessor: any, salt: any) {
+    const abiEncoded = ethers.AbiCoder.defaultAbiCoder().encode(
+        ["address", "uint256", "bytes", "uint256", "bytes32"],
+        [target, value, data, predecessor, salt]
+    );
+    const id = ethers.keccak256(abiEncoded);
+    return {
+        id,
+        target,
+        value,
+        data,
+        predecessor,
+        salt,
+    };
+}
diff --git a/upgrade/upgradePessimistic/upgrade_parameters.json.example b/upgrade/upgradePessimistic/upgrade_parameters.json.example
new file mode 100644
index 00000000..ba1e2fb6
--- /dev/null
+++ b/upgrade/upgradePessimistic/upgrade_parameters.json.example
@@ -0,0 +1,9 @@
+{
+    "rollupManagerAddress": "0x00..",
+    "timelockDelay": 0,
+    "timelockSalt": "",
+    "deployerPvtKey": "",
+    "maxFeePerGas": "",
+    "maxPriorityFeePerGas": "",
+    "multiplierGas": ""
+}