Announcements

FEI Post Mortem

On Sunday May 2nd, 2021, the Fei Labs team identified an economic vulnerability that affected the Fei Protocol, which would have allowed an attacker to drain funds from the ETH-FEI Uniswap pool. The team immediately paused the relevant functionality, and no funds were lost. The Fei team reached out to the OpenZeppelin team, and we worked together to ensure a secure fix for the issue was found.

OpenZeppelin Contracts 4.1

This new release introduces UUPS proxies as a cheaper alternative to Transparent proxies. Additionally, a new ERC20 extension allows easy creation of tokens with built-in flash minting, and a new small utility contract provides a function batching mechanism that requires no extra work to set up. Read on to learn more!

Introducing Contracts Wizard: An Interactive Contract Generator

Contracts Wizard is an interface to interactively build a contract out of components from OpenZeppelin Contracts. Select the kind of contract that you want (current support for ERC20 and ERC721), set your parameters and desired features (token name, symbol, premint amount, access control, etc.), and Wizard will generate all of the code necessary.

OpenZeppelin Contracts 4.0

Due to the new built-in overflow checks in Solidity 0.8, which mark the end of the `SafeMath` era, this release of OpenZeppelin Contracts is a new major version of the library.

Introducing Defender Sentinels – Smart Contract Monitoring & Emergency Response

Today we are announcing the release of a new app, called Sentinels, to help prevent ongoing attacks and exploits in the DeFi space. The app is part of the OpenZeppelin Defender platform, a security operations suite for Ethereum already being used by leading DeFi and NFT teams such as Opyn, Synthetix, TheGraph, PoolTogether, Yearn.Finance, Foundation Labs, and dYdX.

OpenZeppelin Defender – March 2021 Update

We are excited to bring you many new Defender features this month that add powerful functionality to your security operations - all fully included in your Defender account. We built Defender to provide you with a comprehensive platform to automate your smart contract operations, and with these updates you will be able to ship products faster than ever before with built-in security.

OpenZeppelin Contracts 3.4

OpenZeppelin Contracts 3.4 includes an ERC777 security fix for potential reentrancy issues in custom ERC777 extension, virtual view functions, ERC20 permit in drafts, Beacon proxy, and a Minimal Proxy (Clones) library.

Introducing OpenZeppelin Defender

Ship faster with lower risk. Automate your Ethereum operations to deliver high-quality products faster with less risk to users.

The State of Smart Contract Upgrades

The State of Smart Contract Upgrades - 2020 edition
A survey of the different Ethereum smart contract upgrade patterns and strategies from a technical viewpoint, plus a set of good practices and recommendations for upgrades management and governance.

New Tools to Securely Manage Smart Contract Upgrades

We have partnered with Truffle, Nomic Labs (buidler) and Gnosis Safe to release two plugins and a new app to securely deploy and manage upgradeable smart contracts.

FEI Post Mortem

On Sunday May 2nd, 2021, the Fei Labs team identified an economic vulnerability that affected the…

Read More

OpenZeppelin Contracts 4.1

This new release introduces UUPS proxies as a cheaper alternative to Transparent proxies.…

Read More

Introducing Contracts Wizard: An Interactive Contract Generator

Contracts Wizard is an interface to interactively build a contract out of components from…

Read More

OpenZeppelin Contracts 4.0

Due to the new built-in overflow checks in Solidity 0.8, which mark the end of the `SafeMath` era,…

Read More

Introducing Defender Sentinels – Smart Contract Monitoring & Emergency Response

Today we are announcing the release of a new app, called Sentinels, to help prevent ongoing attacks…

Read More

OpenZeppelin Defender – March 2021 Update

We are excited to bring you many new Defender features this month that add powerful functionality…

Read More

OpenZeppelin Contracts 3.4

OpenZeppelin Contracts 3.4 includes an ERC777 security fix for potential reentrancy issues in…

Read More

Introducing OpenZeppelin Defender

Ship faster with lower risk. Automate your Ethereum operations to deliver high-quality products…

Read More

The State of Smart Contract Upgrades

The State of Smart Contract Upgrades - 2020 edition A survey of the different Ethereum smart…

Read More

New Tools to Securely Manage Smart Contract Upgrades

We have partnered with Truffle, Nomic Labs (buidler) and Gnosis Safe to release two plugins and a…

Read More