Update dependency @openzeppelin/contracts to v5

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
@openzeppelin/contracts (source)	^4.5.0 -> ^5.0.0

---

Release Notes

OpenZeppelin/openzeppelin-contracts (@​openzeppelin/contracts)

v5.0.2

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• Base64: Fix issue where dirty memory located just after the input buffer is affecting the result. (#​4926)

v5.0.1

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• ERC2771Context and Context: Introduce a _contextPrefixLength() getter, used to trim extra information appended to msg.data.
• Multicall: Make aware of non-canonical context (i.e. msg.sender is not _msgSender()), allowing compatibility with ERC2771Context.

v5.0.0

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Additions Summary

The following contracts and libraries were added:

• AccessManager: A consolidated system for managing access control in complex systems.
  • AccessManaged: A module for connecting a contract to an authority in charge of its access control.
  • GovernorTimelockAccess: An adapter for time-locking governance proposals using an AccessManager.
  • AuthorityUtils: A library of utilities for interacting with authority contracts.
• GovernorStorage: A Governor module that stores proposal details in storage.
• ERC2771Forwarder: An ERC2771 forwarder for meta transactions.
• ERC1967Utils: A library with ERC1967 events, errors and getters.
• Nonces: An abstraction for managing account nonces.
• MessageHashUtils: A library for producing digests for ECDSA operations.
• Time: A library with helpers for manipulating time-related objects.

Removals Summary

The following contracts, libraries, and functions were removed:

• Address.isContract (because of its ambiguous nature and potential for misuse)
• Checkpoints.History
• Counters
• ERC20Snapshot
• ERC20VotesComp
• ERC165Storage (in favor of inheritance based approach)
• ERC777
• ERC1820Implementer
• GovernorVotesComp
• GovernorProposalThreshold (deprecated since 4.4)
• PaymentSplitter
• PullPayment
• SafeMath
• SignedSafeMath
• Timers
• TokenTimelock (in favor of VestingWallet)
• All escrow contracts (Escrow, ConditionalEscrow and RefundEscrow)
• All cross-chain contracts, including AccessControlCrossChain and all the vendored bridge interfaces
• All presets in favor of OpenZeppelin Contracts Wizard

These removals were implemented in the following PRs: #​3637, #​3880, #​3945, #​4258, #​4276, #​4289

Changes by category

General

• Replaced revert strings and require statements with custom errors. (#​4261)
• Bumped minimum compiler version required to 0.8.20 (#​4288, #​4489)
• Use of abi.encodeCall in place of abi.encodeWithSelector and abi.encodeWithSignature for improved type-checking of parameters (#​4293)
• Replaced some uses of abi.encodePacked with clearer alternatives (e.g. bytes.concat, string.concat). (#​4504) (#​4296)
• Overrides are now used internally for a number of functions that were previously hardcoded to their default implementation in certain locations: ERC1155Supply.totalSupply, ERC721.ownerOf, ERC721.balanceOf and ERC721.totalSupply in ERC721Enumerable, ERC20.totalSupply in ERC20FlashMint, and ERC1967._getImplementation in ERC1967Proxy. (#​4299)
• Removed the override specifier from functions that only override a single interface function. (#​4315)
• Switched to using explicit Solidity import statements. Some previously available symbols may now have to be separately imported. (#​4399)
• Governor, Initializable, and UUPSUpgradeable: Use internal functions in modifiers to optimize bytecode size. (#​4472)
• Upgradeable contracts now use namespaced storage (EIP-7201). (#​4534)
• Upgradeable contracts no longer transpile interfaces and libraries. (#​4628)

Access

• Ownable: Added an initialOwner parameter to the constructor, making the ownership initialization explicit. (#​4267)
• Ownable: Prevent using address(0) as the initial owner. (#​4531)
• AccessControl: Added a boolean return value to the internal _grantRole and _revokeRole functions indicating whether the role was granted or revoked. (#​4241)
• access: Moved AccessControl extensions to a dedicated directory. (#​4359)
• AccessManager: Added a new contract for managing access control of complex systems in a consolidated location. (#​4121)
• AccessManager, AccessManaged, GovernorTimelockAccess: Ensure that calldata shorter than 4 bytes is not padded to 4 bytes. (#​4624)
• AccessManager: Use named return parameters in functions that return multiple values. (#​4624)
• AccessManager: Make schedule and execute more conservative when delay is 0. (#​4644)

Finance

• VestingWallet: Fixed revert during 1 second time window when duration is 0. (#​4502)
• VestingWallet: Use Ownable instead of an immutable beneficiary. (#​4508)

Governance

• Governor: Optimized use of storage for proposal data (#​4268)
• Governor: Added validation in ERC1155 and ERC721 receiver hooks to ensure Governor is the executor. (#​4314)
• Governor: Refactored internals to implement common queuing logic in the core module of the Governor. Added queue and _queueOperations functions that act at different levels. Modules that implement queuing via timelocks are expected to override _queueOperations to implement the timelock-specific logic. Added _executeOperations as the equivalent for execution. (#​4360)
• Governor: Added voter and nonce parameters in signed ballots, to avoid forging signatures for random addresses, prevent signature replay, and allow invalidating signatures. Add voter as a new parameter in the castVoteBySig and castVoteWithReasonAndParamsBySig functions. (#​4378)
• Governor: Added support for casting votes with ERC-1271 signatures by using a bytes memory signature instead of r, s and v arguments in the castVoteBySig and castVoteWithReasonAndParamsBySig functions. (#​4418)
• Governor: Added a mechanism to restrict the address of the proposer using a suffix in the description.
• GovernorStorage: Added a new governor extension that stores the proposal details in storage, with an interface that operates on proposalId, as well as proposal enumerability. This replaces the old GovernorCompatibilityBravo module. (#​4360)
• GovernorTimelockAccess: Added a module to connect a governor with an instance of AccessManager, allowing the governor to make calls that are delay-restricted by the manager using the normal queue workflow. (#​4523)
• GovernorTimelockControl: Clean up timelock id on execution for gas refund. (#​4118)
• GovernorTimelockControl: Added the Governor instance address as part of the TimelockController operation salt to avoid operation id collisions between governors using the same TimelockController. (#​4432)
• TimelockController: Changed the role architecture to use DEFAULT_ADMIN_ROLE as the admin for all roles, instead of the bespoke TIMELOCK_ADMIN_ROLE that was used previously. This aligns with the general recommendation for AccessControl and makes the addition of new roles easier. Accordingly, the admin parameter and timelock will now be granted DEFAULT_ADMIN_ROLE instead of TIMELOCK_ADMIN_ROLE. (#​3799)
• TimelockController: Added a state getter that returns an OperationState enum. (#​4358)
• Votes: Use Trace208 for checkpoints. This enables EIP-6372 clock support for keys but reduces the max supported voting power to uint208. (#​4539)

Metatx

• ERC2771Forwarder: Added deadline for expiring transactions, batching, and more secure handling of msg.value. (#​4346)
• ERC2771Context: Return the forwarder address whenever the msg.data of a call originating from a trusted forwarder is not long enough to contain the request signer address (i.e. msg.data.length is less than 20 bytes), as specified by ERC-2771. (#​4481)
• ERC2771Context: Prevent revert in _msgData() when a call originating from a trusted forwarder is not long enough to contain the request signer address (i.e. msg.data.length is less than 20 bytes). Return the full calldata in that case. (#​4484)

Proxy

• ProxyAdmin: Removed getProxyAdmin and getProxyImplementation getters. (#​3820)
• TransparentUpgradeableProxy: Removed admin and implementation getters, which were only callable by the proxy owner and thus not very useful. (#​3820)
• ERC1967Utils: Refactored the ERC1967Upgrade abstract contract as a library. (#​4325)
• TransparentUpgradeableProxy: Admin is now stored in an immutable variable (set during construction) to avoid unnecessary storage reads on every proxy call. This removed the ability to ever change the admin. Transfer of the upgrade capability is exclusively handled through the ownership of the ProxyAdmin. (#​4354)
• Moved the logic to validate ERC-1822 during an upgrade from ERC1967Utils to UUPSUpgradeable. (#​4356)
• UUPSUpgradeable, TransparentUpgradeableProxy and ProxyAdmin: Removed upgradeTo and upgrade functions, and made upgradeToAndCall and upgradeAndCall ignore the data argument if it is empty. It is no longer possible to invoke the receive function (or send value with empty data) along with an upgrade. (#​4382)
• BeaconProxy: Reject value in initialization unless a payable function is explicitly invoked. (#​4382)
• Proxy: Removed redundant receive function. (#​4434)
• BeaconProxy: Use an immutable variable to store the address of the beacon. It is no longer possible for a BeaconProxy to upgrade by changing to another beacon. (#​4435)
• Initializable: Use the namespaced storage pattern to avoid putting critical variables in slot 0. Allow reinitializer versions greater than 256. (#​4460)
• Initializable: Use intermediate variables to improve readability. (#​4576)

Token

• ERC20, ERC721, ERC1155: Deleted _beforeTokenTransfer and _afterTokenTransfer hooks, added a new internal _update function for customizations, and refactored all extensions using those hooks to use _update instead. (#​3838, #​3876, #​4377)
• ERC20: Removed Approval event previously emitted in transferFrom to indicate that part of the allowance was consumed. With this change, allowances are no longer reconstructible from events. See the code for guidelines on how to re-enable this event if needed. (#​4370)
• ERC20: Removed the non-standard increaseAllowance and decreaseAllowance functions. (#​4585)
• ERC20Votes: Changed internal vote accounting to reusable Votes module previously used by ERC721Votes. Removed implicit ERC20Permit inheritance. Note that the DOMAIN_SEPARATOR getter was previously guaranteed to be available for ERC20Votes contracts, but is no longer available unless ERC20Permit is explicitly used; ERC-5267 support is included in ERC20Votes with EIP712 and is recommended as an alternative. (#​3816)
• SafeERC20: Refactored safeDecreaseAllowance and safeIncreaseAllowance to support USDT-like tokens. (#​4260)
• SafeERC20: Removed safePermit in favor of documentation-only permit recommendations. Based on recommendations from @​trust1995 (#​4582)
• ERC721: _approve no longer allows approving the owner of the tokenId. (#​4377) _setApprovalForAll no longer allows setting address(0) as an operator. (#​4377)
• ERC721: Renamed _requireMinted to _requireOwned and added a return value with the current owner. Implemented ownerOf in terms of _requireOwned. (#​4566)
• ERC721Consecutive: Added a _firstConsecutiveId internal function that can be overridden to change the id of the first token minted through _mintConsecutive. (#​4097)
• ERC721URIStorage: Allow setting the token URI prior to minting. (#​4559)
• ERC721URIStorage, ERC721Royalty: Stop resetting token-specific URI and royalties when burning. (#​4561)
• ERC1155: Optimized array allocation. (#​4196)
• ERC1155: Removed check for address zero in balanceOf. (#​4263)
• ERC1155: Optimized array accesses by skipping bounds checking when unnecessary. (#​4300)
• ERC1155: Bubble errors triggered in the onERC1155Received and onERC1155BatchReceived hooks. (#​4314)
• ERC1155Supply: Added a totalSupply() function that returns the total amount of token circulating, this change will restrict the total tokens minted across all ids to 2**256-1 . (#​3962)
• ERC1155Receiver: Removed in favor of ERC1155Holder. (#​4450)

Utils

• Address: Removed the ability to customize error messages. A common custom error is always used if the underlying revert reason cannot be bubbled up. (#​4502)
• Arrays: Added unsafeMemoryAccess helpers to read from a memory array without checking the length. (#​4300)
• Arrays: Optimized findUpperBound by removing redundant SLOAD. (#​4442)
• Checkpoints: Library moved from utils to utils/structs (#​4275)
• DoubleEndedQueue: Refactored internal structure to use uint128 instead of int128. This has no effect on the library interface. (#​4150)
• ECDSA: Use unchecked arithmetic for the tryRecover function that receives the r and vs short-signature fields separately. (#​4301)
• EIP712: Added internal getters for the name and version strings (#​4303)
• Math: Makes ceilDiv to revert on 0 division even if the numerator is 0 (#​4348)
• Math: Optimized stack operations in mulDiv. (#​4494)
• Math: Renamed members of Rounding enum, and added a new rounding mode for "away from zero". (#​4455)
• MerkleProof: Use custom error to report invalid multiproof instead of reverting with overflow panic. (#​4564)
• MessageHashUtils: Added a new library for creating message digest to be used along with signing or recovery such as ECDSA or ERC-1271. These functions are moved from the ECDSA library. (#​4430)
• Nonces: Added a new contract to keep track of user nonces. Used for signatures in ERC20Permit, ERC20Votes, and ERC721Votes. (#​3816)
• ReentrancyGuard, Pausable: Moved to utils directory. (#​4551)
• Strings: Renamed toString(int256) to toStringSigned(int256). (#​4330)
• Optimized Strings.equal (#​4262)

How to migrate from 4.x

ERC20, ERC721, and ERC1155

These breaking changes will require modifications to ERC20, ERC721, and ERC1155 contracts, since the _afterTokenTransfer and _beforeTokenTransfer functions were removed. Thus, any customization made through those hooks should now be done overriding the new _update function instead.

Minting and burning are implemented by _update and customizations should be done by overriding this function as well. _transfer, _mint and _burn are no longer virtual (meaning they are not overridable) to guard against possible inconsistencies.

For example, a contract using ERC20's _beforeTokenTransfer hook would have to be changed in the following way.

-function _beforeTokenTransfer(
+function _update(
   address from,
   address to,
   uint256 amount
 ) internal virtual override {
-  super._beforeTokenTransfer(from, to, amount);
   require(!condition(), "ERC20: wrong condition");
+  super._update(from, to, amount);
 }

More about ERC721

In the case of ERC721, the _update function does not include a from parameter, as the sender is implicitly the previous owner of the tokenId. The address of this previous owner is returned by the _update function, so it can be used for a posteriori checks. In addition to to and tokenId, a third parameter (auth) is present in this function. This parameter enabled an optional check that the caller/spender is approved to do the transfer. This check cannot be performed after the transfer (because the transfer resets the approval), and doing it before _update would require a duplicate call to _ownerOf.

In this logic of removing hidden SLOADs, the _isApprovedOrOwner function was removed in favor of a new _isAuthorized function. Overrides that used to target the _isApprovedOrOwner should now be performed on the _isAuthorized function. Calls to _isApprovedOrOwner that preceded a call to _transfer, _burn or _approve should be removed in favor of using the auth argument in _update and _approve. This is showcased in ERC721Burnable.burn and in ERC721Wrapper.withdrawTo.

The _exists function was removed. Calls to this function can be replaced by _ownerOf(tokenId) != address(0).

More about ERC1155

Batch transfers will now emit TransferSingle if the batch consists of a single token, while in previous versions the TransferBatch event would be used for all transfers initiated through safeBatchTransferFrom. Both behaviors are compliant with the ERC-1155 specification.

ERC165Storage

Users that were registering EIP-165 interfaces with _registerInterface from ERC165Storage should instead do so by overriding the supportsInterface function as seen below:

function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {
  return interfaceId == type(MyInterface).interfaceId || super.supportsInterface(interfaceId);
}

SafeMath

Methods in SafeMath superseded by native overflow checks in Solidity 0.8.0 were removed along with operations providing an interface for revert strings. The remaining methods were moved to utils/Math.sol.

- import "@​openzeppelin/contracts/utils/math/SafeMath.sol";
+ import "@​openzeppelin/contracts/utils/math/Math.sol";

 function tryOperations(uint256 x, uint256 y) external view {
-  (bool overflowsAdd, uint256 resultAdd) = SafeMath.tryAdd(x, y);
+  (bool overflowsAdd, uint256 resultAdd) = Math.tryAdd(x, y);
-  (bool overflowsSub, uint256 resultSub) = SafeMath.trySub(x, y);
+  (bool overflowsSub, uint256 resultSub) = Math.trySub(x, y);
-  (bool overflowsMul, uint256 resultMul) = SafeMath.tryMul(x, y);
+  (bool overflowsMul, uint256 resultMul) = Math.tryMul(x, y);
-  (bool overflowsDiv, uint256 resultDiv) = SafeMath.tryDiv(x, y);
+  (bool overflowsDiv, uint256 resultDiv) = Math.tryDiv(x, y);
   // ...
 }

Adapting Governor modules

Custom Governor modules that override internal functions may require modifications if migrated to v5. In particular, the new internal functions _queueOperations and _executeOperations may need to be used. If assistance with this migration is needed reach out via the OpenZeppelin Support Forum.

ECDSA and MessageHashUtils

The ECDSA library is now focused on signer recovery. Previously it also included utility methods for producing digests to be used with signing or recovery. These utilities have been moved to the MessageHashUtils library and should be imported if needed:

 import {ECDSA} from "@​openzeppelin/contracts/utils/cryptography/ECDSA.sol";
+import {MessageHashUtils} from "@​openzeppelin/contracts/utils/cryptography/MessageHashUtils.sol";

 contract Verifier {
   using ECDSA for bytes32;
+  using MessageHashUtils for bytes32;

   function _verify(bytes32 data, bytes memory signature, address account) internal pure returns (bool) {
     return data
       .toEthSignedMessageHash()
       .recover(signature) == account;
   }
 }

Interfaces and libraries in upgradeable contracts

The upgradeable version of the contracts library used to include a variant suffixed with Upgradeable for every contract. These variants, which are produced automatically, mainly include changes for dealing with storage that don't apply to libraries and interfaces.

The upgradeable library no longer includes upgradeable variants for libraries and interfaces. Projects migrating to 5.0 should replace their library and interface imports with their corresponding non-upgradeable version:

 // Libraries
-import {AddressUpgradeable} from '@​openzeppelin/contracts-upgradeable/utils/AddressUpgradeable.sol';
+import {Address} from '@​openzeppelin/contracts/utils/Address.sol';

 // Interfaces
-import {IERC20Upgradeable} from '@​openzeppelin/contracts-upgradeable/interfaces/IERC20.sol';
+import {IERC20} from '@​openzeppelin/contracts/interfaces/IERC20.sol';

Offchain Considerations

Some changes may affect offchain systems if they rely on assumptions that are changed along with these new breaking changes. These cases are:

Relying on revert strings for processing errors

A concrete example is AccessControl, where it was previously advised to catch revert reasons using the following regex:

/^AccessControl: account (0x[0-9a-f]{40}) is missing role (0x[0-9a-f]{64})$/

Instead, contracts now revert with custom errors. Systems that interact with smart contracts outside of the network should consider reliance on revert strings and possibly support the new custom errors.

Relying on storage locations for retrieving data

After 5.0, the storage location of some variables were changed. This is the case for Initializable and all the upgradeable contracts since they now use namespaced storaged locations. Any system relying on storage locations for retrieving data or detecting capabilities should be updated to support these new locations.

v4.9.6

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• Base64: Fix issue where dirty memory located just after the input buffer is affecting the result. (#​4929)

v4.9.5

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• Multicall: Make aware of non-canonical context (i.e. msg.sender is not _msgSender()), allowing compatibility with ERC2771Context. Patch duplicated Address.functionDelegateCall in v4.9.4 (removed).

v4.9.4

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• ERC2771Context and Context: Introduce a _contextPrefixLength() getter, used to trim extra information appended to msg.data.
• Multicall: Make aware of non-canonical context (i.e. msg.sender is not _msgSender()), allowing compatibility with ERC2771Context.

v4.9.3

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Note
This release contains a fix for GHSA-g4vp-m682-qqmp.

• ERC2771Context: Return the forwarder address whenever the msg.data of a call originating from a trusted forwarder is not long enough to contain the request signer address (i.e. msg.data.length is less than 20 bytes), as specified by ERC-2771. (#​4481)
• ERC2771Context: Prevent revert in _msgData() when a call originating from a trusted forwarder is not long enough to contain the request signer address (i.e. msg.data.length is less than 20 bytes). Return the full calldata in that case. (#​4484)

v4.9.2

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• MerkleProof: Fix a bug in processMultiProof and processMultiProofCalldata that allows proving arbitrary leaves if the tree contains a node with value 0 at depth 1.

v4.9.1

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• Governor: Add a mechanism to restrict the address of the proposer using a suffix in the description.

v4.9.0

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• ReentrancyGuard: Add a _reentrancyGuardEntered function to expose the guard status. (#​3714)
• ERC721Wrapper: add a new extension of the ERC721 token which wraps an underlying token. Deposit and withdraw guarantee that the ownership of each token is backed by a corresponding underlying token with the same identifier. (#​3863)
• EnumerableMap: add a keys() function that returns an array containing all the keys. (#​3920)
• Governor: add a public cancel(uint256) function. (#​3983)
• Governor: Enable timestamp operation for blockchains without a stable block time. This is achieved by connecting a Governor's internal clock to match a voting token's EIP-6372 interface. (#​3934)
• Strings: add equal method. (#​3774)
• IERC5313: Add an interface for EIP-5313 that is now final. (#​4013)
• IERC4906: Add an interface for ERC-4906 that is now Final. (#​4012)
• StorageSlot: Add support for string and bytes. (#​4008)
• Votes, ERC20Votes, ERC721Votes: support timestamp checkpointing using EIP-6372. (#​3934)
• ERC4626: Add mitigation to the inflation attack through virtual shares and assets. (#​3979)
• Strings: add toString method for signed integers. (#​3773)
• ERC20Wrapper: Make the underlying variable private and add a public accessor. (#​4029)
• EIP712: add EIP-5267 support for better domain discovery. (#​3969)
• AccessControlDefaultAdminRules: Add an extension of AccessControl with additional security rules for the DEFAULT_ADMIN_ROLE. (#​4009)
• SignatureChecker: Add isValidERC1271SignatureNow for checking a signature directly against a smart contract using ERC-1271. (#​3932)
• SafeERC20: Add a forceApprove function to improve compatibility with tokens behaving like USDT. (#​4067)
• ERC1967Upgrade: removed contract-wide oz-upgrades-unsafe-allow delegatecall annotation, replaced by granular annotation in UUPSUpgradeable. (#​3971)
• ERC20Wrapper: self wrapping and deposit by the wrapper itself are now explicitly forbidden. (#​4100)
• ECDSA: optimize bytes32 computation by using assembly instead of abi.encodePacked. (#​3853)
• ERC721URIStorage: Emit ERC-4906 MetadataUpdate in _setTokenURI. (#​4012)
• ShortStrings: Added a library for handling short strings in a gas efficient way, with fallback to storage for longer strings. (#​4023)
• SignatureChecker: Allow return data length greater than 32 from EIP-1271 signers. (#​4038)
• UUPSUpgradeable: added granular oz-upgrades-unsafe-allow-reachable annotation to improve upgrade safety checks on latest version of the Upgrades Plugins (starting with @openzeppelin/upgrades-core@1.21.0). (#​3971)
• Initializable: optimize _disableInitializers by using != instead of <. (#​3787)
• Ownable2Step: make acceptOwnership public virtual to enable usecases that require overriding it. (#​3960)
• UUPSUpgradeable.sol: Change visibility to the functions upgradeTo and upgradeToAndCall from external to public. (#​3959)
• TimelockController: Add the CallSalt event to emit on operation schedule. (#​4001)
• Reformatted codebase with latest version of Prettier Solidity. (#​3898)
• Math: optimize log256 rounding check. (#​3745)
• ERC20Votes: optimize by using unchecked arithmetic. (#​3748)
• Multicall: annotate multicall function as upgrade safe to not raise a flag for its delegatecall. (#​3961)
• ERC20Pausable, ERC721Pausable, ERC1155Pausable: Add note regarding missing public pausing functionality (#​4007)
• ECDSA: Add a function toDataWithIntendedValidatorHash that encodes data with version 0x00 following EIP-191. (#​4063)
• MerkleProof: optimize by using unchecked arithmetic. (#​3745)

Breaking changes

• EIP712: Addition of ERC5267 support requires support for user defined value types, which was released in Solidity version 0.8.8. This requires a pragma change from ^0.8.0 to ^0.8.8.
• EIP712: Optimization of the cache for the upgradeable version affects the way name and version are set. This is no longer done through an initializer, and is instead part of the implementation's constructor. As a consequence, all proxies using the same implementation will necessarily share the same name and version. Additionally, an implementation upgrade risks changing the EIP712 domain unless the same name and version are used when deploying the new implementation contract.

Deprecations

• ERC20Permit: Added the file IERC20Permit.sol and ERC20Permit.sol and deprecated draft-IERC20Permit.sol and draft-ERC20Permit.sol since EIP-2612 is no longer a Draft. Developers are encouraged to update their imports. (#​3793)
• Timers: The Timers library is now deprecated and will be removed in the next major release. (#​4062)
• ERC777: The ERC777 token standard is no longer supported by OpenZeppelin. Our implementation is now deprecated and will be removed in the next major release. The corresponding standard interfaces remain available. (#​4066)
• ERC1820Implementer: The ERC1820 pseudo-introspection mechanism is no longer supported by OpenZeppelin. Our implementation is now deprecated and will be removed in the next major release. The corresponding standard interfaces remain available. (#​4066)

v4.8.3

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• GovernorCompatibilityBravo: Fix encoding of proposal data when signatures are missing.
• TransparentUpgradeableProxy: Fix transparency in case of selector clash with non-decodable calldata or payable mutability. (#​4154)

v4.8.2

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• ERC721Consecutive: Fixed a bug when _mintConsecutive is used for batches of size 1 that could lead to balance overflow. Refer to the breaking changes section in the changelog for a note on the behavior of ERC721._beforeTokenTransfer.

Breaking changes

• ERC721: The internal function _beforeTokenTransfer no longer updates balances, which it previously did when batchSize was greater than 1. This change has no consequence unless a custom ERC721 extension is explicitly invoking _beforeTokenTransfer. Balance updates in extensions must now be done explicitly using __unsafe_increaseBalance, with a name that indicates that there is an invariant that has to be manually verified.

v4.8.1

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• ERC4626: Use staticcall instead of call when fetching underlying ERC-20 decimals. (#​3943)

v4.8.0

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• TimelockController: Added a new admin constructor parameter that is assigned the admin role instead of the deployer account. (#​3722)
• Initializable: add internal functions _getInitializedVersion and _isInitializing (#​3598)
• ERC165Checker: add supportsERC165InterfaceUnchecked for consulting individual interfaces without the full ERC165 protocol. (#​3339)
• Address: optimize functionCall by calling functionCallWithValue directly. (#​3468)
• Address: optimize functionCall functions by checking contract size only if there is no returned data. (#​3469)
• Governor: make the relay function payable, and add support for EOA payments. (#​3730)
• GovernorCompatibilityBravo: remove unused using statements. (#​3506)
• ERC20: optimize _transfer, _mint and _burn by using unchecked arithmetic when possible. (#​3513)
• ERC20Votes, ERC721Votes: optimize getPastVotes for looking up recent checkpoints. (#​3673)
• ERC20FlashMint: add an internal _flashFee function for overriding. (#​3551)
• ERC4626: use the same decimals() as the underlying asset by default (if available). (#​3639)
• ERC4626: add internal _initialConvertToShares and _initialConvertToAssets functions to customize empty vaults behavior. (#​3639)
• ERC721: optimize transfers by making approval clearing implicit instead of emitting an event. (#​3481)
• ERC721: optimize burn by making approval clearing implicit instead of emitting an event. (#​3538)
• ERC721: Fix balance accounting when a custom _beforeTokenTransfer hook results in a transfer of the token under consideration. (#​3611)
• ERC721: use unchecked arithmetic for balance updates. (#​3524)
• ERC721Consecutive: Implementation of EIP-2309 that allows batch minting of ERC721 tokens during construction. (#​3311)
• ReentrancyGuard: Reduce code size impact of the modifier by using internal functions. (#​3515)
• SafeCast: optimize downcasting of signed integers. (#​3565)
• ECDSA: Remove redundant check on the v value. (#​3591)
• VestingWallet: add releasable getters. (#​3580)
• VestingWallet: remove unused library Math.sol. (#​3605)
• VestingWallet: make constructor payable. (#​3665)
• Create2: optimize address computation by using assembly instead of abi.encodePacked. (#​3600)
• Clones: optimized the assembly to use only the scratch space during deployments, and optimized predictDeterministicAddress to use fewer operations. (#​3640)
• Checkpoints: Use procedural generation to support multiple key/value lengths. (#​3589)
• Checkpoints: Add new lookup mechanisms. (#​3589)
• Arrays: Add unsafeAccess functions that allow reading and writing to an element in a storage array bypassing Solidity's "out-of-bounds" check. (#​3589)
• Strings: optimize toString. (#​3573)
• Ownable2Step: extension of Ownable that makes the ownership transfers a two step process. (#​3620)
• Math and SignedMath: optimize function max by using > instead of >=. (#​3679)
• Math: Add log2, log10 and log256. (#​3670)
• Arbitrum: Update the vendored arbitrum contracts to match the nitro upgrade. (#​3692)

Breaking changes

• ERC721: In order to add support for batch minting via ERC721Consecutive it was necessary to make a minor breaking change in the internal interface of ERC721. Namely, the hooks _beforeTokenTransfer and _afterTokenTransfer have one additional argument that may need to be added to overrides:

 function _beforeTokenTransfer(
     address from,
     address to,
     uint256 tokenId,
+    uint256 batchSize
 ) internal virtual override

• ERC4626: Conversion from shares to assets (and vice-versa) in an empty vault used to consider the possible mismatch between the underlying asset's and the vault's decimals. This initial conversion rate is now set to 1-to-1 irrespective of decimals, which are meant for usability purposes only. The vault now uses the assets decimals by default, so off-chain the numbers should appear the same. Developers overriding the vault decimals to a value that does not match the underlying asset may want to override the _initialConvertToShares and _initialConvertToAssets to replicate the previous behavior.

• TimelockController: During deployment, the TimelockController used to grant the TIMELOCK_ADMIN_ROLE to the deployer and to the timelock itself. The deployer was then expected to renounce this role once configuration of the timelock is over. Failing to renounce that role allows the deployer to change the timelock permissions (but not to bypass the delay for any time-locked actions). The role is no longer given to the deployer by default. A new parameter admin can be set to a non-zero address to grant the admin role during construction (to the deployer or any other address). Just like previously, this admin role should be renounced after configuration. If this param is given address(0), the role is not allocated and doesn't need to be revoked. In any case, the timelock itself continues to have this role.

Deprecations

• EIP712: Added the file EIP712.sol and deprecated draft-EIP712.sol since the EIP is no longer a Draft. Developers are encouraged to update their imports. (#​3621)

-import "@​openzeppelin/contracts/utils/cryptography/draft-EIP712.sol";
+import "@​openzeppelin/contracts/utils/cryptography/EIP712.sol";

• ERC721Votes: Added the file ERC721Votes.sol and deprecated draft-ERC721Votes.sol since it no longer depends on a Draft EIP (EIP-712). Developers are encouraged to update their imports. (#​3699)

-import "@​openzeppelin/contracts/token/ERC721/extensions/draft-ERC721Votes.sol";
+import "@​openzeppelin/contracts/token/ERC721/extensions/ERC721Votes.sol";

ERC-721 Compatibility Note

ERC-721 integrators that interpret contract state from events should make sure that they implement the clearing of approval that is implicit in every transfer according to the EIP. Previous versions of OpenZeppelin Contracts emitted an explicit Approval event even though it was not required by the specification, and this is no longer the case.

With the new ERC721Consecutive extension, the internal workings of ERC721 are slightly changed. Custom extensions to ERC721 should be reviewed to ensure they remain correct. The internal functions that should be considered are _ownerOf (new), _beforeTokenTransfer, and _afterTokenTransfer.

ERC-4626 Upgrade Note

Existing ERC4626 contracts that are upgraded to 4.8 must initialize a new variable that holds the vault token decimals. The recommended way to do this is to use a reinitializer:

function migrateToV48() public reinitializer(2) {
  __ERC4626_init(IERC20Upgradeable(asset()));
}

v4.7.3

Compare Source

Breaking changes

• ECDSA: recover(bytes32,bytes) and tryRecover(bytes32,bytes) no longer accept compact signatures to prevent malleability. Compact signature support remains available using recover(bytes32,bytes32,bytes32) and tryRecover(bytes32,bytes32,bytes32).

v4.7.2

Compare Source

• LibArbitrumL2, CrossChainEnabledArbitrumL2: Fixed detection of cross-chain calls for EOAs. Previously, calls from EOAs would be classified as cross-chain calls. (#​3578)
• GovernorVotesQuorumFraction: Fixed quorum updates so they do not affect past proposals that failed due to lack of quorum. (#​3561)
• ERC165Checker: Added protection against large returndata. (#​3587)

v4.7.1

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• SignatureChecker: Fix an issue that causes isValidSignatureNow to revert when the target contract returns ill-encoded data. (#​3552)
• ERC165Checker: Fix an issue that causes supportsInterface to revert when the target contract returns ill-encoded data. (#​3552)

v4.7.0

Compare Source

• TimelockController: Migrate _call to _execute and allow inheritance and overriding similar to Governor. (#​3317)
• CrossChainEnabledPolygonChild: replace the require statement with the custom error NotCrossChainCall. (#​3380)
• ERC20FlashMint: Add customizable flash fee receiver. (#​3327)
• ERC4626: add an extension of ERC20 that implements the ERC4626 Tokenized Vault Standard. (#​3171)
• SafeERC20: add safePermit as mitigation against phantom permit functions. (#​3280)
• Math: add a mulDiv function that can round the result either up or down. (#​3171)
• Math: Add a sqrt function to compute square roots of integers, rounding either up or down. (#​3242)
• Strings: add a new overloaded function toHexString that converts an address with fixed length of 20 bytes to its not checksummed ASCII string hexadecimal representation. (#​3403)
• EnumerableMap: add new UintToUintMap map type. (#​3338)
• EnumerableMap: add new Bytes32ToUintMap map type. (#​3416)
• SafeCast: add support for many more types, using procedural code generation. (#​3245)
• MerkleProof: add multiProofVerify to prove multiple values are part of a Merkle tree. (#​3276)
• MerkleProof: add calldata versions of the functions to avoid copying input arrays to memory and save gas. (#​3200)
• ERC721, ERC1155: simplified revert reasons. (#​3254, (#​3438))
• ERC721: removed redundant require statement. (#​3434)
• PaymentSplitter: add releasable getters. (#​3350)
• Initializable: refactored implementation of modifiers for easier understanding. (#​3450)
• Proxies: remove runtime check of ERC1967 storage slots. (#​3455)

Breaking changes

• Initializable: functions decorated with the modifier reinitializer(1) may no longer invoke each other.

v4.6.0

Compare Source

• crosschain: Add a new set of contracts for cross-chain applications. CrossChainEnabled is a base

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