Hi there, I so similar questions on the forum, but did not find a solution yet. I have to upgrade storage layout in my contract(which is already deployed on mainnet) Current layout uint256[50] private __gap; New layout address private _forwarder; uint256[49] private __gap; Command await upgrade…

Storage gaps is supported in the Hardhat and Truffle upgrades plugins now. See https://docs.openzeppelin.com/upgrades-plugins/1.x/writing-upgradeable#storage-gaps for how to use them.

Hi @aquiladev . I'm sorry this is not natively supported by the plugin yet. I also don't want to rush to implement this feature for you because it's sensitive and would want to review it and test it thoroughly. For your particular use case, I would recommend manually modifying the network file under…

I think I've got your point, thanks

Hi @frangio how should i manually modify file .openzeppelin/unknown-31337.json and still have tests run? currently what happens is that the tests first deploy the first version, which resets unknown-31337.json to have __gap be of size 50 and then the test which upgrades fails as it expects it to be…

@Mister_Singh An alternative would be to test with a modified copy of your first version for now, where the modified copy already has the variable you want to add. Support for storage gaps is planned in https://github.com/OpenZeppelin/openzeppelin-upgrades/issues/276

Using storage gaps with `hardhat-upgrades`

Support Upgrades

Topic		Replies	Views
Bad storage gap resize when adding variables and reducing gap Upgrades	11	935	July 28, 2023
Storage layout compatibility error with contracts-upgradeable 3.2.2 -> 4.5.1 Upgrades erc20 , proxies , hardhat	2	1233	March 17, 2022
Bad storage gap resize with Truffle Upgrades	9	1151	December 14, 2022
upgradeProxy - trying to add ERC2771-support to an existing ERC721 contract Upgrades	5	879	May 4, 2023
Strange error when upgrading contract (UUPS) Support	1	501	January 3, 2022

Using storage gaps with `hardhat-upgrades`

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