# openzeppelin-contracts v5.5.0-rc.0

- Product: openzeppelin-contracts (https://whatsnew.fyi/product/openzeppelin-contracts)
- Vendor: OpenZeppelin
- Date: 2025-09-26
- Version: v5.5.0-rc.0
- Original notes: https://github.com/OpenZeppelin/openzeppelin-contracts/releases/tag/v5.5.0-rc.0
- Permalink: https://whatsnew.fyi/product/openzeppelin-contracts/releases/v5.5.0-rc.0
- Labels: Pre-release

What's New is an index, not a publisher: every entry below links to the vendor's own release notes, which are the authoritative source. Entries are labelled where they are hand-curated sample data, pre-releases, or drawn from a secondary source such as a developer blog.

Reuse: the summaries, labels and curation here are © What's New. Quote freely with attribution and a link back; wholesale republication of the corpus is not permitted — terms: https://whatsnew.fyi/terms. The vendors' own release notes remain their publishers'.

---

- **fixed** — ERC165Checker: Ensure the supportsERC165 function returns false if the target reverts during the supportsInterface(0xffffffff) call
- **removed** — ERC6909 and its extensions (ERC6909ContentURI, ERC6909Metadata and ERC6909TokenSupply) are no longer marked as draft; update import paths
- **removed** — SignerERC7702 is renamed to SignerEIP7702; update imports and inheritance
- **removed** — ERC721Holder, ERC1155Holder, ReentrancyGuard and ReentrancyGuardTransient are no longer transpiled; use versions from @openzeppelin/contracts instead of @openzeppelin/contracts-upgradeable
- **changed** — Update minimum pragma to 0.8.24 in Votes, VotesExtended, ERC20Votes, Strings, ERC1155URIStorage, MessageHashUtils, ERC721URIStorage, ERC721Votes, ERC721Wrapper, ERC721Burnable, ERC721Consecutive, ERC721Enumerable, ERC721Pausable, ERC721Royalty, EIP712, ERC4626 and ERC7739
- **deprecated** — Initializable and UUPSUpgradeable are no longer transpiled; use these files directly from @openzeppelin/contracts package instead of via @openzeppelin/contracts-upgradeable aliases
- **deprecated** — ECDSA signature malleability protection is partly deprecated
- **changed** — ERC4626: compute maxWithdraw using maxRedeem and previewRedeem so that changes to the preview functions affect the max functions
- **added** — InteroperableAddress: Add a library for formatting and parsing ERC-7930 interoperable addresses
- **added** — ERC7786Recipient: Generic ERC-7786 cross-chain message recipient contract
- **added** — IERC7786: Add the interface for ERC-7786 Cross-Chain Messaging Gateway
- **added** — SignerWebAuthn: Add an abstract signer that verifies WebAuthn signatures, with a P256 fallback
- **added** — Add constructors to the different signers
- **added** — ERC7913WebAuthnVerifier: Add an ERC-7913 verifier that verifies WebAuthn Authentication Assertions for P256 identities
- **added** — WebAuthn: Add a library for verifying WebAuthn Authentication Assertions
- **added** — ECDSA: Add parse and parseCalldata to parse bytes signatures of length 65 or 64 (erc-2098) into its v,r,s components
- **added** — ECDSA: Add recoverCalldata and tryRecoverCalldata, variants of recover and tryRecover that are more efficient when signatures are in calldata
- **added** — SignatureChecker: Add isValidSignatureNowCalldata(address,bytes32,bytes calldata) for efficient processing of calldata signatures

###### Bug fixes

- `ERC165Checker`: Ensure the `supportsERC165` function returns false if the target reverts during the `supportsInterface(0xffffffff)` call. ([#5810](https://github.com/OpenZeppelin/openzeppelin-contracts/pull/5880))

###### Breaking changes

- `ERC6909` and its extensions (`ERC6909ContentURI`, `ERC6909Metadata` and `ERC6909TokenSupply`) are no longer marked as draft since [EIP-6909](https://eips.ethereum.org/EIPS/eip-6909) is now final. Developers must update the import paths. Contracts behavior is not modified. ([#5929](https://github.com/OpenZeppelin/openzeppelin-contracts/pull/5929))
- `SignerERC7702` is renamed as `SignerEIP7702`. Imports and inheritance must be updated to that new name and path. Behavior is unmodified. ([#5932](https://github.com/OpenZeppelin/openzeppelin-contracts/pull/5932))
- `ERC721Holder`, `ERC1155Holder`, `ReentrancyGuard` and `ReentrancyGuardTransient` are flagged as stateless and are no longer transpiled. Developers using their upgradeable variants from `@openzeppelin/contracts-upgradeable` must update their imports to use the equivalent version available in `@openzeppelin/contracts`. ([#5944](https://github.com/OpenZeppelin/openzeppelin-contracts/pull/5944), [#5942](https://github.com/OpenZeppelin/openzeppelin-contracts/pull/5942))
- Update minimum pragma to 0.8.24 in `Votes`, `VotesExtended`, `ERC20Votes`, `Strings`, `ERC1155URIStorage`, `MessageHashUtils`, `ERC721URIStorage`, `ERC721Votes`, `ERC721Wrapper`, `ERC721Burnable`, `ERC721Consecutive`, `ERC721Enumerable`, `ERC721Pausable`, `ERC721Royalty`, `ERC721Wrapper`, `EIP712`, `ERC4626` and `ERC7739`. ([#5726](https://github.com/OpenZeppelin/openzeppelin-contracts/pull/5726))

###### Deprecation

- `Initializable` and `UUPSUpgradeable` are no longer transpiled. An alias is present in the `@openzeppelin/contracts-upgradeable` package that redirect to the corresponding file in `@openzeppelin/contracts`. These alias will be removed in the next major release. Developers are advised to update their imports to get these files directly from the `@openzeppelin/contracts` package. [#5941](https://github.com/OpenZeppelin/openzeppelin-contracts/pull/5941)
- `ECDSA` signature malleability protection is partly deprecated. See documentation for more details. [#5814](https://github.com/OpenZeppelin/openzeppelin-contracts/pull/5814)

###### Changes by category

###### Tokens

- `ERC4626`: compute `maxWithdraw` using `maxRedeem` and `previewRedeem` so that changes to the preview functions affect the max functions. ([#5130](https://github.com/OpenZeppelin/openzeppelin-contracts/pull/5130))

###### Cross-chain

- `InteroperableAddress`: Add a library for formatting and parsing ERC-7930 interoperable addresses. ([#5736](https://github.com/OpenZeppelin/openzeppelin-contracts/pull/5736))
- `ERC7786Recipient`: Generic ERC-7786 cross-chain message recipient contract. ([#5904](https://github.com/OpenZeppelin/openzeppelin-contracts/pull/5904))
- `IERC7786`: Add the (draft) interface for ERC-7786 "Cross-Chain Messaging Gateway" ([#5737](https://github.com/OpenZeppelin/openzeppelin-contracts/pull/5737))

###### Cryptography

###### Signers

- `SignerWebAuthn`: Add an abstract signer that verifies WebAuthn signatures, with a P256 fallback. ([#5809](https://github.com/OpenZeppelin/openzeppelin-contracts/pull/5809))
- Add constructors to the different signers. ([#5757](https://github.com/OpenZeppelin/openzeppelin-contracts/pull/5757))

###### Verifiers

- `ERC7913WebAuthnVerifier`: Add an ERC-7913 verifier that verifies WebAuthn Authentication Assertions for P256 identities. ([#5809](https://github.com/OpenZeppelin/openzeppelin-contracts/pull/5809))

###### Other

- `WebAuthn`: Add a library for verifying WebAuthn Authentication Assertions. ([#5809](https://github.com/OpenZeppelin/openzeppelin-contracts/pull/5809))
- `ECDSA`: Add `parse` and `parseCalldata` to parse bytes signatures of length 65 or 64 (erc-2098) int

_[Truncated at 4000 characters — full notes: https://github.com/OpenZeppelin/openzeppelin-contracts/releases/tag/v5.5.0-rc.0]_