# After upgrade using prepareUpgrade() with Gnosis Safe MyContract.address returns the imp. address

**URL:** <https://forum.openzeppelin.com/t/after-upgrade-using-prepareupgrade-with-gnosis-safe-mycontract-address-returns-the-imp-address/7293>\
**Category:** Upgrades\
**Created:** [April 23, 2021, 3:47pm UTC](https://forum.openzeppelin.com/t/after-upgrade-using-prepareupgrade-with-gnosis-safe-mycontract-address-returns-the-imp-address/7293 "2021-04-23T15:47:17Z")\
**Posts on this page:** 1\
**Showing post:** 3

<div class="post-metadata">

**Author:** ![Homer](https://sea2.discourse-cdn.com/flex022/user_avatar/forum.openzeppelin.com/homer/32/4254_2.png) [@Homer](https://forum.openzeppelin.com/u/Homer)\
**Post date:** [April 24, 2021, 8:17am UTC](https://forum.openzeppelin.com/t/after-upgrade-using-prepareupgrade-with-gnosis-safe-mycontract-address-returns-the-imp-address/7293/3 "2021-04-24T08:17:46Z")

</div>

Thank you very much @Yoshiko, for your post.  
Yes, I assume that existingContract.address gives me back the proxy address of MyContract.

I follow the tutorial

> [@OpenZeppelin Upgrades: Step by Step Tutorial for Truffle](https://forum.openzeppelin.com/t/openzeppelin-upgrades-step-by-step-tutorial-for-truffle/3579):
>
> OpenZeppelin Truffle Upgrades Smart contracts deployed with the OpenZeppelin Upgrades plugins can be upgraded to modify their code, while preserving their address, state, and balance. This allows you to iteratively add new features to your project, or fix any bugs you may find in production. In this guide, we will show the lifecycle using OpenZeppelin Truffle Upgrades and Gnosis Safe from creating, testing and deploying, all the way through to upgrading with Gnosis Sa…

What I don't understand is, why MyContract.deployed() first returns the proxy address and after the upgrade the new implementation address.

Moreover, before using Gnosis Safe, I did the upgrade as follows:

`const newContract = await upgradeProxy(existingContract.address, MyContract, { deployer });`

That worked as expected. Querying the ProxyAdmin (on Etherscan) getProxyImplementation(proxyAddress) I get the correct implementation address.

Here the code of 1\_DeployOrUpgrade.js:

```
const Migrations = artifacts.require("Migrations");
const { deployProxy, upgradeProxy } = require('@openzeppelin/truffle-upgrades');
const { admin } = require('@openzeppelin/truffle-upgrades');
const { prepareUpgrade } = require('@openzeppelin/truffle-upgrades');
const argv = require('minimist')(process.argv.slice(2), {string: ['operation']});

const MyContract = artifacts.require("MyContract");

module.exports = async function (deployer, network) {
  var operation = argv['operation'];
  await deployer.deploy(Migrations);
  switch(operation) {
    case 'deploy':
      const myContract = await deployProxy(MyContract, { deployer});
      const myContractProxyAddress = myContract.address;
      console.log('Deployed ', myContractProxyAddress);
      break;
    case 'upgrade':
      var gnosisSafe;
      switch(network) {
        case 'rinkeby':
          gnosisSafe = '0x97826de55402165A9c317E30e53CF65BE75226B9';
          await admin.transferProxyAdminOwnership(gnosisSafe);
          break;
        default:
          break;
      }
      if(MyContract.isDeployed() ) {
        const existingMyContract = await MyContract.deployed();
        //const newMyContract = await upgradeProxy(existingMyContract.address, MyContract, { deployer });
        const newMyContract = await prepareUpgrade(existingMyContract.address, MyContract, { deployer });
        console.log('Upgraded ', newMyContract.address);

      } else {
        console.log("Not upgraded. Not all required contracts are deployed: ");
        console.log("MyContract: ", MyContract.isDeployed());
      }
      break;
    default:
      console.log("Operation unknown.");
      break;
  }
};

```

In the MyContract.json under  
"networks"."4"."address:" now is the address of the implementation contract, before it was the address of the proxy contract. I guess `MyContract.deployed()` reads the address from there.

Here the package versions:

├─┬ @openzeppelin/truffle-upgrades@1.5.0

│ ├── @openzeppelin/upgrades-core@1.5.1

│ ├── @truffle/contract@4.3.13

│ └── solidity-ast@0.4.19

I can reproduce this scenario on the dev network.

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