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    1.7.1 • Public • Published

    OpenZeppelin Hardhat Defender Upgrades

    Docs NPM Package

    Hardhat plugin for integrating upgrades with OpenZeppelin Defender. This package adds functions to your Hardhat scripts so you can propose upgrades for your contracts and approve them via Defender Admin. Depends on @openzeppelin/hardhat-upgrades and ethers.js.


    Use this package to manage upgrades for mainnet contracts using Hardhat scripts, and then approve them by a multisig through Defender Admin.

    You can use @openzeppelin/hardhat-upgrades to deploy your upgradeable contracts via deployProxy, and then transfer the admin powers to a multi-signature wallet via transferProxyAdminOwnership for additional security.

    When you want to upgrade, use proposeUpgrade to prepare the upgrade, and create a new upgrade proposal in Defender Admin. The multisig admins can then review the upgrade in Defender, and sign their approval.

    Approve an Upgrade in Defender Admin


    npm install --save-dev @openzeppelin/hardhat-defender
    npm install --save-dev @nomiclabs/hardhat-ethers ethers # peer dependencies

    Register the plugin in your hardhat.config.js:

    // Javascript
    // Typescript
    import '@openzeppelin/hardhat-defender';

    And add your Defender Team API key to the exported configuration in hardhat.config.js:

    module.exports = {
      defender: {
        apiKey: process.env.API_KEY,
        apiSecret: process.env.API_SECRET,

    Usage in scripts

    You can use this plugin in a Hardhat script to propose an upgrade for a contract previously deployed with deployProxy:

    // scripts/propose-upgrade.js
    const { defender } = require("hardhat");
    async function main() {
      const BoxV2 = await ethers.getContractFactory("BoxV2");
      const proposal = await defender.proposeUpgrade(BOX_ADDRESS, BoxV2);
      console.log("Upgrade proposal created at:", proposal.url);

    This will automatically check that the Box contract deployed at BOX_ADDRESS can be safely upgraded to BoxV2, deploy the BoxV2 implementation contract, and create a new upgrade proposal in Defender Admin.

    Note that proposeUpgrade will only deploy the implementation contract, but will not change anything in your proxy contract. Any changes must be approved by the upgrade admin(s), who can do so either via Defender or manually.

    Learn more




    npm i @openzeppelin/hardhat-defender

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