# Announcements **URL:** https://forum.openzeppelin.com/c/general/announcements/21.md [Latest](https://forum.openzeppelin.com/latest.md) · [Categories](https://forum.openzeppelin.com/categories.md) · [Tags](https://forum.openzeppelin.com/tags.md) --- ## [Unveiling Uniswap Hooks by OpenZeppelin](https://forum.openzeppelin.com/t/unveiling-uniswap-hooks-by-openzeppelin/41869)
**Author:** [@sebaleoperez](https://forum.openzeppelin.com/u/sebaleoperez)\ **Replies:** 0\ **Last updated:** [October 21, 2024, 3:55pm UTC](https://forum.openzeppelin.com/t/unveiling-uniswap-hooks-by-openzeppelin/41869 "2024-10-21T15:55:00Z")
We’re excited to announce that we are developing a new library to leverage the powerful new features of Uniswap v4. This iteration of the Uniswap protocol introduces hooks as its standout feature, allowing devs to add cu… --- ## [Release Candidate for Contracts 5.1](https://forum.openzeppelin.com/t/release-candidate-for-contracts-5-1/41755)
**Author:** [@Amxx](https://forum.openzeppelin.com/u/Amxx)\ **Replies:** 1\ **Last updated:** [October 17, 2024, 2:53pm UTC](https://forum.openzeppelin.com/t/release-candidate-for-contracts-5-1/41755 "2024-10-17T14:53:20Z")
The release candidate for OpenZeppelin Contracts 5.1 has been published! More details in the announcement below: --- ## [UUPSUpgradeable Vulnerability Post-mortem](https://forum.openzeppelin.com/t/uupsupgradeable-vulnerability-post-mortem/15680)
**Author:** [@spalladino](https://forum.openzeppelin.com/u/spalladino)\ **Replies:** 13\ **Last updated:** [March 16, 2024, 6:52am UTC](https://forum.openzeppelin.com/t/uupsupgradeable-vulnerability-post-mortem/15680 "2024-03-16T06:52:00Z")
In early September, we received two independent reports of a vulnerability in the UUPSUpgradeable base contract of the OpenZeppelin Contracts library, first released in version 4.0 in April, 2021. In this post, we share… --- ## [Release Candidate for Contracts 5.0](https://forum.openzeppelin.com/t/release-candidate-for-contracts-5-0/37896)
**Author:** [@frangio](https://forum.openzeppelin.com/u/frangio)\ **Replies:** 1\ **Last updated:** [October 6, 2023, 10:26pm UTC](https://forum.openzeppelin.com/t/release-candidate-for-contracts-5-0/37896 "2023-10-06T22:26:02Z")
The release candidate for OpenZeppelin Contracts 5.0 has been published! More details in the announcement below: --- ## [Defender: Potential Impact of The Graph Maintenance Aug 14th](https://forum.openzeppelin.com/t/defender-potential-impact-of-the-graph-maintenance-aug-14th/37402)
**Author:** [@jonathan](https://forum.openzeppelin.com/u/jonathan)\ **Replies:** 0\ **Last updated:** [August 8, 2023, 8:54pm UTC](https://forum.openzeppelin.com/t/defender-potential-impact-of-the-graph-maintenance-aug-14th/37402 "2023-08-08T20:54:32Z")
Please be advised that The Graph’s hosted service, which OpenZeppelin Defender uses for access control features in Defender Admin, will undergo scheduled database maintenance on Aug 14, 2023, 07:00 UTC (12am PT, 3am ET a… --- ## [Security advisory: Initialize UUPS implementation contracts](https://forum.openzeppelin.com/t/security-advisory-initialize-uups-implementation-contracts/15301)
**Author:** [@spalladino](https://forum.openzeppelin.com/u/spalladino)\ **Replies:** 28\ **Last updated:** [July 26, 2023, 12:33am UTC](https://forum.openzeppelin.com/t/security-advisory-initialize-uups-implementation-contracts/15301 "2023-07-26T00:33:55Z")
Update September 14th: We have published a security advisory and released Contracts v4.3.2 with a hotfix for this vulnerability. Still, it is now recommended you always initialize your implementation contracts as explain… --- ## [Defender: Potential Impact of The Graph Maintenance June 22nd](https://forum.openzeppelin.com/t/defender-potential-impact-of-the-graph-maintenance-june-22nd/36739)
**Author:** [@jonathan](https://forum.openzeppelin.com/u/jonathan)\ **Replies:** 0\ **Last updated:** [June 16, 2023, 5:32pm UTC](https://forum.openzeppelin.com/t/defender-potential-impact-of-the-graph-maintenance-june-22nd/36739 "2023-06-16T17:32:37Z")
Please be advised that The Graph’s hosted service, which OpenZeppelin Defender uses for access control features in Defender Admin, will undergo scheduled database maintenance on June 22, 2023, 05:00 UTC (10pm PT on June … --- ## [Defender Release: Support for Sepolia](https://forum.openzeppelin.com/t/defender-release-support-for-sepolia/36224)
**Author:** [@Aleksandr](https://forum.openzeppelin.com/u/Aleksandr)\ **Replies:** 0\ **Last updated:** [May 15, 2023, 1:16pm UTC](https://forum.openzeppelin.com/t/defender-release-support-for-sepolia/36224 "2023-05-15T13:16:36Z")
We are pleased to announce that the latest release of Defender now includes Sepolia support. We would greatly appreciate your feedback regarding this new addition. Your input will help us improve this feature to better … --- ## [Defender Release: Support for Base Goerli](https://forum.openzeppelin.com/t/defender-release-support-for-base-goerli/35802)
**Author:** [@slw.eth](https://forum.openzeppelin.com/u/slw.eth)\ **Replies:** 0\ **Last updated:** [April 19, 2023, 1:00pm UTC](https://forum.openzeppelin.com/t/defender-release-support-for-base-goerli/35802 "2023-04-19T13:00:34Z")
Announcing Defender support for Base L2 Testnet Base L2 testnet support has been enabled for all OpenZeppelin Defender users. Users can now import contracts (including abstracted accounts) and automatically retrieve the… --- ## [Defender Release: Support for zkSync Era](https://forum.openzeppelin.com/t/defender-release-support-for-zksync-era/35565)
**Author:** [@slw.eth](https://forum.openzeppelin.com/u/slw.eth)\ **Replies:** 0\ **Last updated:** [April 4, 2023, 6:27pm UTC](https://forum.openzeppelin.com/t/defender-release-support-for-zksync-era/35565 "2023-04-04T18:27:31Z")
Both zkSync Era Testnet and zkSync Era Mainnet have been enabled in Defender for all users! Users can now import contracts (including abstracted accounts) for both networks and automatically retrieve the contract ABI if… --- ## [OpenZeppelin upgradeable contracts affected by Istanbul hardfork](https://forum.openzeppelin.com/t/openzeppelin-upgradeable-contracts-affected-by-istanbul-hardfork/1616)
**Author:** [@nventuro](https://forum.openzeppelin.com/u/nventuro)\ **Replies:** 3\ **Last updated:** [March 8, 2023, 9:40pm UTC](https://forum.openzeppelin.com/t/openzeppelin-upgradeable-contracts-affected-by-istanbul-hardfork/1616 "2023-03-08T21:40:42Z")
Executive summary: once the Istanbul hardfork occurs (around early 2020), a very specific interaction with OpenZeppelin/ZeppelinOS upgradeable (proxy) contracts will no longer work (receiving Ether from other contracts v… --- ## [Join us January 10 for a Web3 Security Twitter Space with Compound Finance and Gauntlet](https://forum.openzeppelin.com/t/join-us-january-10-for-a-web3-security-twitter-space-with-compound-finance-and-gauntlet/34087)
**Author:** [@slw.eth](https://forum.openzeppelin.com/u/slw.eth)\ **Replies:** 0\ **Last updated:** [January 3, 2023, 10:26pm UTC](https://forum.openzeppelin.com/t/join-us-january-10-for-a-web3-security-twitter-space-with-compound-finance-and-gauntlet/34087 "2023-01-03T22:26:47Z")
Are you interested in learning more about web3 security? If so, be sure to tune in to our upcoming Twitter space on the topic. On January 10, join us for a live discussion on how to securely upgrade a DeFi protocol when… --- ## [Defender Release: Verifying deployment bytecode](https://forum.openzeppelin.com/t/defender-release-verifying-deployment-bytecode/31531)
**Author:** [@spalladino](https://forum.openzeppelin.com/u/spalladino)\ **Replies:** 0\ **Last updated:** [August 29, 2022, 8:00pm UTC](https://forum.openzeppelin.com/t/defender-release-verifying-deployment-bytecode/31531 "2022-08-29T20:00:43Z")
Hey everyone! We've released a new version of Defender that allows for verifying the bytecode of any contract. You can use this to check that a given address is running the version of the code you'd expect, allowing audi… --- ## [\[Action Required\]: Defender Autotask runtime upgrade](https://forum.openzeppelin.com/t/action-required-defender-autotask-runtime-upgrade/33017)
**Author:** [@zeljko](https://forum.openzeppelin.com/u/zeljko)\ **Replies:** 2\ **Last updated:** [November 23, 2022, 5:39pm UTC](https://forum.openzeppelin.com/t/action-required-defender-autotask-runtime-upgrade/33017 "2022-11-23T17:39:30Z")
Autotask is a snippet of javascript code invoked at a regular interval, similar to a serverless function. And as a matter of fact, they are implemented with Lambda functions. As stated in Defender documentation, Autot… --- ## [\[Possible Action Required\]: Free-Tier OpenZeppelin Defender Account Pulse-Check Underway](https://forum.openzeppelin.com/t/possible-action-required-free-tier-openzeppelin-defender-account-pulse-check-underway/32886)
**Author:** [@slw.eth](https://forum.openzeppelin.com/u/slw.eth)\ **Replies:** 0\ **Last updated:** [November 2, 2022, 4:05pm UTC](https://forum.openzeppelin.com/t/possible-action-required-free-tier-openzeppelin-defender-account-pulse-check-underway/32886 "2022-11-02T16:05:03Z")
To ensure our user list is up-to-date, we are currently in the phase of notifying free-tier Defender accounts that appear to be inactive. This activity is measured by whether a user has done at least one of the following… --- ## [Defender Release: Infrastructure as Code, Sentinel matches history, and more](https://forum.openzeppelin.com/t/defender-release-infrastructure-as-code-sentinel-matches-history-and-more/31975)
**Author:** [@MartinVerzilli](https://forum.openzeppelin.com/u/MartinVerzilli)\ **Replies:** 0\ **Last updated:** [September 20, 2022, 11:15pm UTC](https://forum.openzeppelin.com/t/defender-release-infrastructure-as-code-sentinel-matches-history-and-more/31975 "2022-09-20T23:15:37Z")
Hello! We're pleased to announce a new Defender release, with the following highlights: Defender Serverless: Infrastructure as code You can now manage all your Defender assets through yaml Serverless files. Define auto… --- ## [Defender Release: Role-based access control, Hedera support, and more!](https://forum.openzeppelin.com/t/defender-release-role-based-access-control-hedera-support-and-more/31710)
**Author:** [@dan\_oz](https://forum.openzeppelin.com/u/dan_oz)\ **Replies:** 0\ **Last updated:** [September 6, 2022, 11:19pm UTC](https://forum.openzeppelin.com/t/defender-release-role-based-access-control-hedera-support-and-more/31710 "2022-09-06T23:19:33Z")
Hi everyone! We shipped a number of new features in the latest Defender release. We've been hard at work for a long time on role-based access control and it's finally here! You can read about it as well as Hedera suppor… --- ## [Defender Release: Admin simulations, safe & finalized sentinel tags, more speed for Polygon txs, and more!](https://forum.openzeppelin.com/t/defender-release-admin-simulations-safe-finalized-sentinel-tags-more-speed-for-polygon-txs-and-more/31426)
**Author:** [@spalladino](https://forum.openzeppelin.com/u/spalladino)\ **Replies:** 2\ **Last updated:** [August 30, 2022, 5:33pm UTC](https://forum.openzeppelin.com/t/defender-release-admin-simulations-safe-finalized-sentinel-tags-more-speed-for-polygon-txs-and-more/31426 "2022-08-30T17:33:48Z")
Hey everyone! We've released a new Defender version, which includes simulations for Admin proposals, reviewing past proposals effects, safe and finalized tags for Sentinels, fastest speed relayer transaction support on P… --- ## [Defender Release: EIP1559 support, Access Control in Admin, Optimism Goerli and Arbitrum Goerli, and more!](https://forum.openzeppelin.com/t/defender-release-eip1559-support-access-control-in-admin-optimism-goerli-and-arbitrum-goerli-and-more/31192)
**Author:** [@MartinVerzilli](https://forum.openzeppelin.com/u/MartinVerzilli)\ **Replies:** 0\ **Last updated:** [August 15, 2022, 12:46pm UTC](https://forum.openzeppelin.com/t/defender-release-eip1559-support-access-control-in-admin-optimism-goerli-and-arbitrum-goerli-and-more/31192 "2022-08-15T12:46:42Z")
Hi community! It's been a while since we announced Defender releases here, but they have been happening nevertheless. So let's catch up on all the new stuff we added to Defender in the last ~50 days: EIP1559 support Def… --- ## [Upgrades Plugins: Etherscan verification for proxies](https://forum.openzeppelin.com/t/upgrades-plugins-etherscan-verification-for-proxies/29251)
**Author:** [@ericglau](https://forum.openzeppelin.com/u/ericglau)\ **Replies:** 7\ **Last updated:** [July 25, 2022, 5:20pm UTC](https://forum.openzeppelin.com/t/upgrades-plugins-etherscan-verification-for-proxies/29251 "2022-07-25T17:20:26Z")
OpenZeppelin Upgrades Plugins are the recommended way to deploy and manage upgradeable contracts. They help you to make use of upgradeable proxy patterns that can involve a number of different contracts. In the lates… --- ## [Release Candidate for Contracts 4.7: Open Review Period](https://forum.openzeppelin.com/t/release-candidate-for-contracts-4-7-open-review-period/29443)
**Author:** [@frangio](https://forum.openzeppelin.com/u/frangio)\ **Replies:** 1\ **Last updated:** [June 29, 2022, 9:04am UTC](https://forum.openzeppelin.com/t/release-candidate-for-contracts-4-7-open-review-period/29443 "2022-06-29T09:04:27Z")
We've published the release candidate for the next version of OpenZeppelin Contracts. There are a ton of changes and additions! This begins the Open Review Period for the release, during which we ask the community to re… --- ## [Defender Release: Hedera Sentinels, Additional Sentinel Confirmations, Sentinel Match Reasons](https://forum.openzeppelin.com/t/defender-release-hedera-sentinels-additional-sentinel-confirmations-sentinel-match-reasons/29534)
**Author:** [@dylkil](https://forum.openzeppelin.com/u/dylkil)\ **Replies:** 0\ **Last updated:** [June 10, 2022, 12:35pm UTC](https://forum.openzeppelin.com/t/defender-release-hedera-sentinels-additional-sentinel-confirmations-sentinel-match-reasons/29534 "2022-06-10T12:35:36Z")
Hey everyone! We've released a new version of Defender, with the following features: Hedera Sentinels internal calls Additional confirmation options for BSC and Ropsten sentinels Sentinel Match Reasons address … --- ## [Defender Release: Fireblocks execution strategy for Admin Proposals, Sentinels Support for Hedera network and Logging](https://forum.openzeppelin.com/t/defender-release-fireblocks-execution-strategy-for-admin-proposals-sentinels-support-for-hedera-network-and-logging/29330)
**Author:** [@zeljko](https://forum.openzeppelin.com/u/zeljko)\ **Replies:** 0\ **Last updated:** [June 3, 2022, 11:02am UTC](https://forum.openzeppelin.com/t/defender-release-fireblocks-execution-strategy-for-admin-proposals-sentinels-support-for-hedera-network-and-logging/29330 "2022-06-03T11:02:05Z")
Hey everyone! We've released a new version of Defender, with the following features: Fireblocks execution strategy for Admin Proposals Sentinels Support for Hedera network Logging Fireblocks Support Fireblocks is an a… --- ## [Defender Release: Optimism, Frame, improved Forta Sentinels, and full Relayer CRUD API!](https://forum.openzeppelin.com/t/defender-release-optimism-frame-improved-forta-sentinels-and-full-relayer-crud-api/28293)
**Author:** [@spalladino](https://forum.openzeppelin.com/u/spalladino)\ **Replies:** 0\ **Last updated:** [May 2, 2022, 6:27pm UTC](https://forum.openzeppelin.com/t/defender-release-optimism-frame-improved-forta-sentinels-and-full-relayer-crud-api/28293 "2022-05-02T18:27:44Z")
Hey everyone! We've released a new version of Defender, with the following features: Optimism L2 support Create and manage Relayers via API Forta metadata in Sentinel alert payloads Frame wallet support Optimism L2 Su… --- ## [Release Candidate for Contracts 4.6: Open Review Period](https://forum.openzeppelin.com/t/release-candidate-for-contracts-4-6-open-review-period/27075)
**Author:** [@frangio](https://forum.openzeppelin.com/u/frangio)\ **Replies:** 1\ **Last updated:** [April 29, 2022, 6:53am UTC](https://forum.openzeppelin.com/t/release-candidate-for-contracts-4-6-open-review-period/27075 "2022-04-29T06:53:44Z")
We've published the release candidate for the next version of OpenZeppelin Contracts. There are a ton of changes and additions! This begins the Open Review Period for the release, during which we ask the community to re… --- ## [Release Candidate for Contracts 4.5: Open Review Period](https://forum.openzeppelin.com/t/release-candidate-for-contracts-4-5-open-review-period/22700)
**Author:** [@frangio](https://forum.openzeppelin.com/u/frangio)\ **Replies:** 6\ **Last updated:** [February 9, 2022, 9:07pm UTC](https://forum.openzeppelin.com/t/release-candidate-for-contracts-4-5-open-review-period/22700 "2022-02-09T21:07:50Z")
We've published the release candidate for the next version of OpenZeppelin Contracts. There are a ton of changes and additions! This begins the Open Review Period for the release, during which we ask the community to re… --- ## [OpenZeppelin CLI 2.8: Release Candidate](https://forum.openzeppelin.com/t/openzeppelin-cli-2-8-release-candidate/2297)
**Author:** [@frangio](https://forum.openzeppelin.com/u/frangio)\ **Replies:** 10\ **Last updated:** [February 9, 2022, 1:04am UTC](https://forum.openzeppelin.com/t/openzeppelin-cli-2-8-release-candidate/2297 "2022-02-09T01:04:06Z")
This is a release candidate. View the final announcement at OpenZeppelin CLI 2.8: Opt out of Upgradeability. Last week we released version 2.7 of the CLI, and we're already presenting the release candidate for vers… --- ## [Defender Jan 2022 Release: Alerts formatting, ERC20 proposals, and more!](https://forum.openzeppelin.com/t/defender-jan-2022-release-alerts-formatting-erc20-proposals-and-more/23120)
**Author:** [@spalladino](https://forum.openzeppelin.com/u/spalladino)\ **Replies:** 0\ **Last updated:** [January 21, 2022, 2:17pm UTC](https://forum.openzeppelin.com/t/defender-jan-2022-release-alerts-formatting-erc20-proposals-and-more/23120 "2022-01-21T14:17:24Z")
This release includes new stuff for Sentinels, such as custom alerts formatting and new confirmation levels, plus some improvements for Admin proposals! Sentinel alerts formatting You can now define a custom template fo… --- ## [Upgrades Plugins: Support for beacon proxies](https://forum.openzeppelin.com/t/upgrades-plugins-support-for-beacon-proxies/22635)
**Author:** [@ericglau](https://forum.openzeppelin.com/u/ericglau)\ **Replies:** 0\ **Last updated:** [January 13, 2022, 6:57pm UTC](https://forum.openzeppelin.com/t/upgrades-plugins-support-for-beacon-proxies/22635 "2022-01-13T18:57:21Z")
OpenZeppelin Upgrades Plugins are the recommended way for users to deploy and manage their upgradeable contracts. They augment your Hardhat or Truffle setup with the ability to upgrade your contracts. If you’re new to… --- ## [What's new in Defender, November 2021 Update!](https://forum.openzeppelin.com/t/whats-new-in-defender-november-2021-update/20223)
**Author:** [@MartinVerzilli](https://forum.openzeppelin.com/u/MartinVerzilli)\ **Replies:** 0\ **Last updated:** [December 3, 2021, 4:09pm UTC](https://forum.openzeppelin.com/t/whats-new-in-defender-november-2021-update/20223 "2021-12-03T16:09:49Z")
December is here (time flies, doesn't it?) and now it's a good time to look back at a bunch new features that have landed on Defender throughout November. Defender is now free! Anyone can now start using Defender for fr… [Next page](https://forum.openzeppelin.com/c/general/announcements/21.md?page=1)