forge install: forge-std

v1.9.2

.changeset/beige-buses-drop.md

@@ -1,5 +0,0 @@
----
-'openzeppelin-solidity': patch
----
-
-`Initializable`: optimize `_disableInitializers` by using `!=` instead of `<`. ([#3787](https://github.com/OpenZeppelin/openzeppelin-contracts/pull/3787))

.changeset/chilled-walls-develop.md

@@ -0,0 +1,5 @@
+---
+'openzeppelin-solidity': minor
+---
+
+`Clones`: Add version of `clone` and `cloneDeterministic` that support sending value at creation.

.changeset/chilly-humans-warn.md

@@ -0,0 +1,5 @@
+---
+'openzeppelin-solidity': patch
+---
+
+`ProxyAdmin`: Fixed documentation for `UPGRADE_INTERFACE_VERSION` getter.

.changeset/cold-cheetahs-check.md

@@ -0,0 +1,5 @@
+---
+'openzeppelin-solidity': minor
+---
+
+`CircularBuffer`: Add a data structure that stores the last `N` values pushed to it.

.changeset/cool-mangos-compare.md

@@ -0,0 +1,5 @@
+---
+'openzeppelin-solidity': minor
+---
+
+`Math`: add an `invMod` function to get the modular multiplicative inverse of a number in Z/nZ.

.changeset/curvy-crabs-repeat.md

@@ -0,0 +1,5 @@
+---
+'openzeppelin-solidity': minor
+---
+
+`RSA`: Library to verify signatures according to RFC 8017 Signature Verification Operation

.changeset/curvy-shrimps-enjoy.md

@@ -1,5 +0,0 @@
----
-'openzeppelin-solidity': minor
----
-
-`ReentrancyGuard`: Add a `_reentrancyGuardEntered` function to expose the guard status. ([#3714](https://github.com/OpenZeppelin/openzeppelin-contracts/pull/3714))

.changeset/curvy-suns-sort.md

@@ -1,5 +0,0 @@
----
-'openzeppelin-solidity': patch
----
-
-`Ownable2Step`: make `acceptOwnership` public virtual to enable usecases that require overriding it. ([#3960](https://github.com/OpenZeppelin/openzeppelin-contracts/pull/3960))

.changeset/dirty-cobras-smile.md

@@ -0,0 +1,5 @@
+---
+'openzeppelin-solidity': minor
+---
+
+`Arrays`: add a `sort` functions for `address[]`, `bytes32[]` and `uint256[]` memory arrays.

.changeset/early-oranges-raise.md

@@ -1,5 +0,0 @@
----
-'openzeppelin-solidity': minor
----
-
-`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.

.changeset/eight-eyes-burn.md

@@ -0,0 +1,5 @@
+---
+'openzeppelin-solidity': minor
+---
+
+`GovernorCountingFractional`: Add a governor counting module that allows distributing voting power amongst 3 options (For, Against, Abstain).

.changeset/eleven-planets-relax.md

@@ -0,0 +1,5 @@
+---
+'openzeppelin-solidity': patch
+---
+
+`TransparentUpgradeableProxy`: Make internal `_proxyAdmin()` getter have `view` visibility.

.changeset/famous-rules-burn.md

@@ -1,5 +0,0 @@
----
-'openzeppelin-solidity': minor
----
-
-`EnumerableMap`: add a `keys()` function that returns an array containing all the keys. ([#3920](https://github.com/OpenZeppelin/openzeppelin-contracts/pull/3920))

.changeset/five-ducks-develop.md

@@ -1,5 +0,0 @@
----
-'openzeppelin-solidity': patch
----
-
-`UUPSUpgradeable.sol`: Change visibility to the functions `upgradeTo ` and `upgradeToAndCall ` from `external` to `public`.

.changeset/five-poets-mix.md

@@ -1,5 +0,0 @@
----
-'openzeppelin-solidity': patch
----
-
-`TimelockController`: Add the `CallSalt` event to emit on operation schedule.

.changeset/flat-deers-end.md

@@ -1,5 +0,0 @@
----
-'openzeppelin-solidity': minor
----
-
-`Governor`: add a public `cancel(uint256)` function.

.changeset/flat-turtles-repeat.md

@@ -0,0 +1,5 @@
+---
+'openzeppelin-solidity': minor
+---
+
+`Arrays`: deprecate `findUpperBound` in favor of the new `lowerBound`.

.changeset/fluffy-buses-jump.md

@@ -0,0 +1,5 @@
+---
+'openzeppelin-solidity': minor
+---
+
+`Comparator`: A library of comparator functions, useful for customizing the behavior of the Heap structure.

.changeset/fluffy-steaks-exist.md

@@ -0,0 +1,5 @@
+---
+'openzeppelin-solidity': patch
+---
+
+`Create2`, `Clones`: Mask `computeAddress` and `cloneDeterministic` outputs to produce a clean value for an `address` type (i.e. only use 20 bytes)

.changeset/forty-dodos-visit.md

@@ -0,0 +1,5 @@
+---
+'openzeppelin-solidity': minor
+---
+
+`Strings`: Added a utility function for converting an address to checksummed string.

.changeset/four-bats-sniff.md

@@ -1,5 +0,0 @@
----
-'openzeppelin-solidity': minor
----
-
-`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.

.changeset/friendly-nails-push.md

@@ -0,0 +1,5 @@
+---
+'openzeppelin-solidity': minor
+---
+
+`ERC1363`: Add implementation of the token payable standard allowing execution of contract code after transfers and approvals.

.changeset/funny-rockets-compete.md

@@ -1,5 +0,0 @@
----
-'openzeppelin-solidity': patch
----
-
-Reformatted codebase with latest version of Prettier Solidity. ([#3898](https://github.com/OpenZeppelin/openzeppelin-contracts/pull/3898))

.changeset/gentle-bulldogs-turn.md

@@ -0,0 +1,5 @@
+---
+'openzeppelin-solidity': minor
+---
+
+`DoubleEndedQueue`: Custom errors replaced with native panic codes.

.changeset/gold-chicken-clean.md

@@ -1,5 +0,0 @@
----
-'openzeppelin-solidity': minor
----
-
-`Strings`: add `equal` method. ([#3774](https://github.com/OpenZeppelin/openzeppelin-contracts/pull/3774))

.changeset/gorgeous-badgers-vanish.md

@@ -0,0 +1,5 @@
+---
+'openzeppelin-solidity': minor
+---
+
+`SlotDerivation`: Add a library of methods for derivating common storage slots.

.changeset/great-pianos-work.md

@@ -0,0 +1,5 @@
+---
+'openzeppelin-solidity': minor
+---
+
+`Heap`: A data structure that implements a heap-based priority queue.

.changeset/happy-socks-travel.md

@@ -1,5 +0,0 @@
----
-'openzeppelin-solidity': minor
----
-
-`IERC5313`: Add an interface for EIP-5313 that is now final.

.changeset/healthy-squids-stare.md

@@ -1,5 +0,0 @@
----
-'openzeppelin-solidity': patch
----
-
-`Math`: optimize `log256` rounding check. ([#3745](https://github.com/OpenZeppelin/openzeppelin-contracts/pull/3745))

.changeset/heavy-baboons-give.md

@@ -0,0 +1,5 @@
+---
+'openzeppelin-solidity': minor
+---
+
+`Packing`: Added a new utility for packing, extracting and replacing bytesXX values.

.changeset/kind-planets-cough.md

@@ -0,0 +1,5 @@
+---
+'openzeppelin-solidity': minor
+---
+
+`StorageSlot`: Add primitives for operating on the transient storage space using a typed-slot representation.

.changeset/lemon-dogs-kiss.md

@@ -1,5 +0,0 @@
----
-'openzeppelin-solidity': patch
----
-
-`ERC20Votes`: optimize by using unchecked arithmetic. ([#3748](https://github.com/OpenZeppelin/openzeppelin-contracts/pull/3748))

.changeset/light-news-listen.md

@@ -0,0 +1,5 @@
+---
+'openzeppelin-solidity': minor
+---
+
+`AccessManager`: Allow the `onlyAuthorized` modifier to restrict functions added to the manager.

.changeset/little-kiwis-ring.md

@@ -1,5 +0,0 @@
----
-'openzeppelin-solidity': patch
----
-
-`Multicall`: annotate `multicall` function as upgrade safe to not raise a flag for its delegatecall. ([#3961](https://github.com/OpenZeppelin/openzeppelin-contracts/pull/3961))

.changeset/lovely-dragons-appear.md

@@ -1,5 +0,0 @@
----
-'openzeppelin-solidity': minor
----
-
-`IERC4906`: Add an interface for ERC-4906 that is now Final.

.changeset/lucky-crews-eat.md

@@ -0,0 +1,5 @@
+---
+'openzeppelin-solidity': minor
+---
+
+`Votes`: Set `_moveDelegateVotes` visibility to internal instead of private.

.changeset/modern-games-exist.md

@@ -1,5 +0,0 @@
----
-'openzeppelin-solidity': minor
----
-
-`StorageSlot`: Add support for `string` and `bytes`.

.changeset/nervous-eyes-teach.md

@@ -0,0 +1,5 @@
+---
+'openzeppelin-solidity': minor
+---
+
+`Create2`: Bubbles up returndata from a deployed contract that reverted during construction.

.changeset/nervous-pans-grow.md

@@ -0,0 +1,5 @@
+---
+'openzeppelin-solidity': patch
+---
+
+`SafeCast`: Add `toUint(bool)` for operating on `bool` values as `uint256`.

.changeset/new-ways-own.md

@@ -1,5 +0,0 @@
----
-'openzeppelin-solidity': patch
----
-
-`ERC20Pausable`, `ERC721Pausable`, `ERC1155Pausable`: Add note regarding missing public pausing functionality

.changeset/nice-paws-pull.md

@@ -0,0 +1,5 @@
+---
+'openzeppelin-solidity': minor
+---
+
+`SafeERC20`: Add "relaxed" function for interacting with ERC-1363 functions in a way that is compatible with EOAs.

.changeset/ninety-hornets-kick.md

@@ -1,5 +0,0 @@
----
-'openzeppelin-solidity': minor
----
-
-`Votes`, `ERC20Votes`, `ERC721Votes`: support timestamp checkpointing using EIP-6372.

.changeset/odd-files-protect.md

@@ -0,0 +1,5 @@
+---
+'openzeppelin-solidity': minor
+---
+
+`Hashes`: A library with commonly used hash functions.

.changeset/odd-lobsters-wash.md

@@ -0,0 +1,5 @@
+---
+'openzeppelin-solidity': minor
+---
+
+`P256`: Library for verification and public key recovery of P256 (aka secp256r1) signatures.

.changeset/perfect-insects-listen.md

@@ -1,5 +0,0 @@
----
-'openzeppelin-solidity': minor
----
-
-`ERC4626`: Add mitigation to the inflation attack through virtual shares and assets.

.changeset/poor-chefs-cheat.md

@@ -0,0 +1,5 @@
+---
+'openzeppelin-solidity': minor
+---
+
+`ERC721Utils` and `ERC1155Utils`: Add reusable libraries with functions to perform acceptance checks on `IERC721Receiver` and `IERC1155Receiver` implementers.

.changeset/pretty-hornets-play.md

@@ -1,5 +0,0 @@
----
-'openzeppelin-solidity': minor
----
-
-`Strings`: add `toString` method for signed integers. ([#3773](https://github.com/OpenZeppelin/openzeppelin-contracts/pull/3773))

.changeset/proud-comics-deliver.md

@@ -1,5 +0,0 @@
----
-'openzeppelin-solidity': minor
----
-
-`ERC20Wrapper`: Make the `underlying` variable private and add a public accessor.

.changeset/serious-carrots-provide.md

@@ -0,0 +1,5 @@
+---
+'openzeppelin-solidity': minor
+---
+
+`ERC20TemporaryApproval`: Add an ERC-20 extension that implements temporary approval using transient storage, based on ERC7674 (draft).

.changeset/shiny-poets-whisper.md

@@ -0,0 +1,5 @@
+---
+'openzeppelin-solidity': minor
+---
+
+`Math`: Add `modExp` function that exposes the `EIP-198` precompile. Includes `uint256` and `bytes memory` versions.

.changeset/short-roses-judge.md

@@ -1,5 +0,0 @@
----
-'openzeppelin-solidity': minor
----
-
-`EIP712`: add EIP-5267 support for better domain discovery.

.changeset/silent-dancers-type.md

@@ -1,5 +0,0 @@
----
-'openzeppelin-solidity': minor
----
-
-`AccessControlDefaultAdminRules`: Add an extension of `AccessControl` with additional security rules for the `DEFAULT_ADMIN_ROLE`.

.changeset/silver-swans-promise.md

@@ -0,0 +1,5 @@
+---
+'openzeppelin-solidity': minor
+---
+
+`Panic`: Add a library for reverting with panic codes.

.changeset/slimy-knives-hug.md

@@ -1,5 +0,0 @@
----
-'openzeppelin-solidity': minor
----
-
-`SignatureChecker`: Add `isValidERC1271SignatureNow` for checking a signature directly against a smart contract using ERC-1271.

.changeset/small-cars-appear.md

@@ -1,5 +0,0 @@
----
-'openzeppelin-solidity': patch
----
-
-`ECDSA`: Add a function `toDataWithIntendedValidatorHash` that encodes data with version 0x00 following EIP-191.

.changeset/small-terms-sleep.md

@@ -1,5 +0,0 @@
----
-'openzeppelin-solidity': minor
----
-
-`SafeERC20`: Add a `forceApprove` function to improve compatibility with tokens behaving like USDT.

.changeset/smart-bugs-switch.md

@@ -0,0 +1,5 @@
+---
+'openzeppelin-solidity': minor
+---
+
+`Math`: Custom errors replaced with native panic codes.

.changeset/spotty-falcons-explain.md

@@ -0,0 +1,5 @@
+---
+'openzeppelin-solidity': minor
+---
+
+`Math`, `SignedMath`: Add a branchless `ternary` function that computes`cond ? a : b` in constant gas cost.

.changeset/spotty-queens-own.md

@@ -0,0 +1,5 @@
+---
+'openzeppelin-solidity': minor
+---
+
+`MerkleProof`: Add variations of `verify`, `processProof`, `multiProofVerify` and `processMultiProof` (and equivalent calldata version) with support for custom hashing functions.

.changeset/strong-bulldogs-buy.md

@@ -1,5 +0,0 @@
----
-'openzeppelin-solidity': minor
----
-
-`ERC1967Upgrade`: removed contract-wide `oz-upgrades-unsafe-allow delegatecall` annotation, replaced by granular annotation in `UUPSUpgradeable`.

.changeset/strong-singers-talk.md

@@ -0,0 +1,5 @@
+---
+'openzeppelin-solidity': minor
+---
+
+`Errors`: New library of common custom errors.

.changeset/tame-ladybugs-sit.md

@@ -1,5 +0,0 @@
----
-'openzeppelin-solidity': patch
----
-
-`MerkleProof`: optimize by using unchecked arithmetic. ([#3745](https://github.com/OpenZeppelin/openzeppelin-contracts/pull/3745))

.changeset/tender-needles-dance.md

@@ -1,7 +0,0 @@
----
-'openzeppelin-solidity': minor
----
-
-`ERC20Wrapper`: self wrapping and deposit by the wrapper itself are now explicitelly forbiden.
-
-commit: 3214f6c25

.changeset/thick-pumpkins-report.md

@@ -0,0 +1,5 @@
+---
+'openzeppelin-solidity': minor
+---
+
+`Arrays`: add new functions `lowerBound`, `upperBound`, `lowerBoundMemory` and `upperBoundMemory` for lookups in sorted arrays with potential duplicates.

.changeset/thin-dragons-report.md

@@ -1,5 +0,0 @@
----
-'openzeppelin-solidity': minor
----
-
-`ECDSA`: optimize bytes32 computation by using assembly instead of `abi.encodePacked`.

.changeset/thin-walls-drop.md

@@ -0,0 +1,5 @@
+---
+'openzeppelin-solidity': minor
+---
+
+`AccessManager`, `VestingWallet`, `TimelockController` and `ERC2771Forwarder`: Added a public `initializer` function in their corresponding upgradeable variants.

.changeset/thirty-swans-exercise.md

@@ -1,5 +0,0 @@
----
-'openzeppelin-solidity': minor
----
-
-`ERC721URIStorage`: Emit ERC-4906 `MetadataUpdate` in `_setTokenURI`.

.changeset/tricky-bats-pretend.md

@@ -0,0 +1,5 @@
+---
+'openzeppelin-solidity': minor
+---
+
+`ERC1363Utils`: Add helper similar to the existing `ERC721Utils` and `ERC1155Utils`

.changeset/twenty-feet-grin.md

@@ -0,0 +1,5 @@
+---
+'openzeppelin-solidity': minor
+---
+
+`Base64`: Add `encodeURL` following section 5 of RFC4648 for URL encoding

.changeset/violet-frogs-hide.md

@@ -1,5 +0,0 @@
----
-'openzeppelin-solidity': minor
----
-
-`ShortStrings`: Added a library for handling short strings in a gas efficient way, with fallback to storage for longer strings.

.changeset/violet-moons-tell.md

@@ -0,0 +1,5 @@
+---
+'openzeppelin-solidity': minor
+---
+
+`AccessControlEnumerable`: Add a `getRoleMembers` method to return all accounts that have `role`.

.changeset/warm-masks-obey.md

@@ -1,5 +0,0 @@
----
-'openzeppelin-solidity': minor
----
-
-`SignatureChecker`: Allow return data length greater than 32 from EIP-1271 signers.

.changeset/warm-sheep-cover.md

@@ -0,0 +1,5 @@
+---
+'openzeppelin-solidity': minor
+---
+
+`MerkleTree`: A data structure that allows inserting elements into a merkle tree and updating its root hash.

.changeset/wise-bobcats-speak.md

@@ -0,0 +1,5 @@
+---
+'openzeppelin-solidity': minor
+---
+
+`VestingWalletCliff`: Add an extension of the `VestingWallet` contract with an added cliff.

.changeset/witty-chicken-smile.md

@@ -0,0 +1,5 @@
+---
+'openzeppelin-solidity': minor
+---
+
+`ReentrancyGuardTransient`: Added a variant of `ReentrancyGuard` that uses transient storage.

.changeset/yellow-deers-walk.md

@@ -0,0 +1,5 @@
+---
+'openzeppelin-solidity': minor
+---
+
+`EnumerableMap`: add `UintToBytes32Map`, `AddressToAddressMap`, `AddressToBytes32Map` and `Bytes32ToAddressMap`.

.changeset/yellow-moles-hammer.md

@@ -0,0 +1,5 @@
+---
+'openzeppelin-solidity': minor
+---
+
+`SignatureChecker`: refactor `isValidSignatureNow` to avoid validating ECDSA signatures if there is code deployed at the signer's address.

.changeset/yellow-swans-cover.md

@@ -1,5 +0,0 @@
----
-'openzeppelin-solidity': minor
----
-
-`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`).

.codecov.yml

@@ -10,3 +10,6 @@ coverage:
     project:
       default:
         threshold: 1%
+ignore:
+  - "test"
+  - "contracts/mocks"

.githooks/pre-push

@@ -0,0 +1,8 @@
+#!/usr/bin/env bash
+
+set -euo pipefail
+
+if [ "${CI:-"false"}" != "true" ]; then
+  npm run test:generation
+  npm run lint
+fi

.github/ISSUE_TEMPLATE/bug_report.md

@@ -10,7 +10,7 @@ about: Report a bug in OpenZeppelin Contracts
 
 **💻 Environment**
 
-<!-- Tell us what version of OpenZeppelin Contracts you're using, and how you're using it: Truffle, Remix, etc. -->
+<!-- Tell us what version of OpenZeppelin Contracts you're using, and how you're using it: Hardhat, Remix, etc. -->
 
 **📝 Details**
 

.github/actions/gas-compare/action.yml

@@ -1,4 +1,5 @@
 name: Compare gas costs
+description: Compare gas costs between branches
 inputs:
   token:
     description: github token

.github/actions/setup/action.yml

@@ -1,12 +1,13 @@
 name: Setup
+description: Common environment setup
 
 runs:
   using: composite
   steps:
-    - uses: actions/setup-node@v3
+    - uses: actions/setup-node@v4
       with:
-        node-version: 14.x
-    - uses: actions/cache@v3
+        node-version: 20.x
+    - uses: actions/cache@v4
       id: cache
       with:
         path: '**/node_modules'
@@ -15,5 +16,7 @@ runs:
       run: npm ci
       shell: bash
       if: steps.cache.outputs.cache-hit != 'true'
-      env:
-        SKIP_COMPILE: true
+    - name: Install Foundry
+      uses: foundry-rs/foundry-toolchain@v1
+      with:
+        version: nightly

.github/actions/storage-layout/action.yml

@@ -1,4 +1,5 @@
 name: Compare storage layouts
+description: Compare storage layouts between branches
 inputs:
   token:
     description: github token

.github/workflows/actionlint.yml

@@ -9,7 +9,7 @@ jobs:
   lint:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - name: Add problem matchers
         run: |
           # https://github.com/rhysd/actionlint/blob/3a2f2c7/docs/usage.md#problem-matchers

.github/workflows/changeset.yml

@@ -19,7 +19,7 @@ jobs:
     runs-on: ubuntu-latest
     if: ${{ !contains(github.event.pull_request.labels.*.name, 'ignore-changeset') }}
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
         with:
           fetch-depth: 0 # Include history so Changesets finds merge-base
       - name: Set up environment

.github/workflows/checks.yml

@@ -4,6 +4,7 @@ on:
   push:
     branches:
       - master
+      - next-v*
       - release-v*
   pull_request: {}
   workflow_dispatch: {}
@@ -12,11 +13,14 @@ concurrency:
   group: checks-${{ github.ref }}
   cancel-in-progress: true
 
+env:
+  NODE_OPTIONS: --max_old_space_size=8192
+
 jobs:
   lint:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - name: Set up environment
         uses: ./.github/actions/setup
       - run: npm run lint
@@ -25,10 +29,12 @@ jobs:
     runs-on: ubuntu-latest
     env:
       FORCE_COLOR: 1
-      NODE_OPTIONS: --max_old_space_size=4096
+      # Needed for "eth-gas-reporter" to produce a "gasReporterOutput.json" as documented in
+      # https://github.com/cgewecke/eth-gas-reporter/blob/v0.2.27/docs/gasReporterOutput.md
+      CI: true
       GAS: true
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - name: Set up environment
         uses: ./.github/actions/setup
       - name: Run tests and generate gas report
@@ -47,67 +53,80 @@ jobs:
     env:
       FORCE_COLOR: 1
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
         with:
           fetch-depth: 0 # Include history so patch conflicts are resolved automatically
       - name: Set up environment
         uses: ./.github/actions/setup
+      - name: Copy non-upgradeable contracts as dependency
+        run: |
+          mkdir -p lib/openzeppelin-contracts
+          cp -rnT contracts lib/openzeppelin-contracts/contracts
       - name: Transpile to upgradeable
         run: bash scripts/upgradeable/transpile.sh
       - name: Run tests
         run: npm run test
-        env:
-          NODE_OPTIONS: --max_old_space_size=4096
       - name: Check linearisation of the inheritance graph
         run: npm run test:inheritance
       - name: Check storage layout
         uses: ./.github/actions/storage-layout
+        continue-on-error: ${{ contains(github.event.pull_request.labels.*.name, 'breaking change') }}
         with:
           token: ${{ github.token }}
 
   tests-foundry:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
         with:
           submodules: recursive
-      - name: Install Foundry
-        uses: foundry-rs/foundry-toolchain@v1
-        with:
-          version: nightly
+      - name: Set up environment
+        uses: ./.github/actions/setup
       - name: Run tests
         run: forge test -vv
 
   coverage:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - name: Set up environment
         uses: ./.github/actions/setup
-      - run: npm run coverage
+      - name: Run coverage
+        run: npm run coverage
+      - uses: codecov/codecov-action@v4
         env:
-          NODE_OPTIONS: --max_old_space_size=4096
-      - uses: codecov/codecov-action@v3
-        with:
-          token: ${{ secrets.CODECOV_TOKEN }}
+          CODECOV_TOKEN: ${{ secrets.CODECOV_TOKEN }}
+
+  harnesses:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - name: Set up environment
+        uses: ./.github/actions/setup
+      - name: Compile harnesses
+        run: |
+          make -C certora apply
+          npm run compile:harnesses
 
   slither:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - name: Set up environment
         uses: ./.github/actions/setup
       - run: rm foundry.toml
-      - uses: crytic/slither-action@v0.3.0
+      - uses: crytic/slither-action@v0.4.0
         with:
           node-version: 18.15
+          slither-version: 0.10.1
 
   codespell:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - name: Run CodeSpell
-        uses: codespell-project/actions-codespell@v1.0
+        uses: codespell-project/actions-codespell@v2.1
         with:
+          check_hidden: true
           check_filenames: true
           skip: package-lock.json,*.pdf

.github/workflows/docs.yml

@@ -11,7 +11,7 @@ jobs:
   build:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - name: Set up environment
         uses: ./.github/actions/setup
       - run: bash scripts/git-user-config.sh

.github/workflows/formal-verification.yml

@@ -10,9 +10,9 @@ on:
   workflow_dispatch: {}
 
 env:
-  PIP_VERSION: '3.10'
+  PIP_VERSION: '3.11'
   JAVA_VERSION: '11'
-  SOLC_VERSION: '0.8.19'
+  SOLC_VERSION: '0.8.20'
 
 concurrency: ${{ github.workflow }}-${{ github.ref }}
 
@@ -20,7 +20,7 @@ jobs:
   apply-diff:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - name: Apply patches
         run: make -C certora apply
 
@@ -28,7 +28,7 @@ jobs:
     runs-on: ubuntu-latest
     if: github.event_name != 'pull_request' || contains(github.event.pull_request.labels.*.name, 'formal-verification')
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
         with:
           fetch-depth: 0
       - name: Set up environment
@@ -44,12 +44,13 @@ jobs:
           fi
           echo "result=$RESULT" >> "$GITHUB_OUTPUT"
       - name: Install python
-        uses: actions/setup-python@v4
+        uses: actions/setup-python@v5
         with:
           python-version: ${{ env.PIP_VERSION }}
           cache: 'pip'
+          cache-dependency-path: 'fv-requirements.txt'
       - name: Install python packages
-        run: pip install -r requirements.txt
+        run: pip install -r fv-requirements.txt
       - name: Install java
         uses: actions/setup-java@v3
         with:
@@ -66,3 +67,20 @@ jobs:
           node certora/run.js ${{ steps.arguments.outputs.result }} >> "$GITHUB_STEP_SUMMARY"
         env:
           CERTORAKEY: ${{ secrets.CERTORAKEY }}
+
+  halmos:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - name: Set up environment
+        uses: ./.github/actions/setup
+      - name: Install python
+        uses: actions/setup-python@v5
+        with:
+          python-version: ${{ env.PIP_VERSION }}
+          cache: 'pip'
+          cache-dependency-path: 'fv-requirements.txt'
+      - name: Install python packages
+        run: pip install -r fv-requirements.txt
+      - name: Run Halmos
+        run: halmos --match-test '^symbolic|^testSymbolic' -vv

.github/workflows/release-cycle.yml

@@ -27,12 +27,12 @@ jobs:
       pull-requests: read
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - name: Set up environment
         uses: ./.github/actions/setup
       - id: state
         name: Get state
-        uses: actions/github-script@v6
+        uses: actions/github-script@v7
         env:
           TRIGGERING_ACTOR: ${{ github.triggering_actor }}
         with:
@@ -58,7 +58,7 @@ jobs:
     if: needs.state.outputs.start == 'true'
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - name: Set up environment
         uses: ./.github/actions/setup
       - run: bash scripts/git-user-config.sh
@@ -66,7 +66,7 @@ jobs:
         name: Create branch with release candidate
         run: bash scripts/release/workflow/start.sh
       - name: Re-run workflow
-        uses: actions/github-script@v6
+        uses: actions/github-script@v7
         env:
           REF: ${{ steps.start.outputs.branch }}
         with:
@@ -81,7 +81,7 @@ jobs:
     if: needs.state.outputs.promote == 'true'
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - name: Set up environment
         uses: ./.github/actions/setup
       - run: bash scripts/git-user-config.sh
@@ -89,7 +89,7 @@ jobs:
         if: needs.state.outputs.is_prerelease == 'true'
         run: bash scripts/release/workflow/exit-prerelease.sh
       - name: Re-run workflow
-        uses: actions/github-script@v6
+        uses: actions/github-script@v7
         with:
           script: await require('./scripts/release/workflow/rerun.js')({ github, context })
 
@@ -102,13 +102,13 @@ jobs:
     if: needs.state.outputs.changesets == 'true'
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
         with:
           fetch-depth: 0 # To get all tags
       - name: Set up environment
         uses: ./.github/actions/setup
       - name: Set release title
-        uses: actions/github-script@v6
+        uses: actions/github-script@v7
         with:
           result-encoding: string
           script: await require('./scripts/release/workflow/set-changesets-pr-title.js')({ core })
@@ -134,7 +134,7 @@ jobs:
     if: needs.state.outputs.publish == 'true'
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - name: Set up environment
         uses: ./.github/actions/setup
       - id: pack
@@ -143,22 +143,18 @@ jobs:
         env:
           PRERELEASE: ${{ needs.state.outputs.is_prerelease }}
       - name: Upload tarball artifact
-        uses: actions/upload-artifact@v3
+        uses: actions/upload-artifact@v4
         with:
           name: ${{ github.ref_name }}
           path: ${{ steps.pack.outputs.tarball }}
-      - name: Tag
-        run: npx changeset tag
       - name: Publish
         run: bash scripts/release/workflow/publish.sh
         env:
           NPM_TOKEN: ${{ secrets.NPM_TOKEN }}
           TARBALL: ${{ steps.pack.outputs.tarball }}
           TAG: ${{ steps.pack.outputs.tag }}
-      - name: Push tags
-        run: git push --tags
       - name: Create Github Release
-        uses: actions/github-script@v6
+        uses: actions/github-script@v7
         env:
           PRERELEASE: ${{ needs.state.outputs.is_prerelease }}
         with:
@@ -171,12 +167,10 @@ jobs:
     name: Tarball Integrity Check
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - name: Download tarball artifact
         id: artifact
-        # Replace with actions/upload-artifact@v3 when
-        # https://github.com/actions/download-artifact/pull/194 gets released
-        uses: actions/download-artifact@e9ef242655d12993efdcda9058dee2db83a2cb9b
+        uses: actions/download-artifact@v4
         with:
           name: ${{ github.ref_name }}
       - name: Check integrity
@@ -192,23 +186,27 @@ jobs:
       pull-requests: write
     if: needs.state.outputs.merge == 'true'
     runs-on: ubuntu-latest
+    env:
+      MERGE_BRANCH: merge/${{ github.ref_name }}
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
         with:
           fetch-depth: 0 # All branches
       - name: Set up environment
         uses: ./.github/actions/setup
       - run: bash scripts/git-user-config.sh
       - name: Create branch to merge
-        run: bash scripts/release/workflow/prepare-release-merge.sh
+        run: |
+          git checkout -B "$MERGE_BRANCH" "$GITHUB_REF_NAME"
+          git push -f origin "$MERGE_BRANCH"
       - name: Create PR back to master
-        uses: actions/github-script@v6
+        uses: actions/github-script@v7
         with:
           script: |
             await github.rest.pulls.create({
               owner: context.repo.owner,
               repo: context.repo.repo,
-              head: 'merge/${{ github.ref_name }}',
+              head: process.env.MERGE_BRANCH,
               base: 'master',
               title: '${{ format('Merge {0} branch', github.ref_name) }}'
             });

.github/workflows/upgradeable.yml

@@ -11,20 +11,24 @@ jobs:
     environment: push-upgradeable
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
         with:
           repository: OpenZeppelin/openzeppelin-contracts-upgradeable
           fetch-depth: 0
           token: ${{ secrets.GH_TOKEN_UPGRADEABLE }}
       - name: Fetch current non-upgradeable branch
         run: |
-          git fetch "https://github.com/${{ github.repository }}.git" "$REF"
+          git fetch "$REMOTE" master # Fetch default branch first for patch to apply cleanly
+          git fetch "$REMOTE" "$REF"
           git checkout FETCH_HEAD
         env:
           REF: ${{ github.ref }}
+          REMOTE: https://github.com/${{ github.repository }}.git
       - name: Set up environment
         uses: ./.github/actions/setup
       - run: bash scripts/git-user-config.sh
       - name: Transpile to upgradeable
         run: bash scripts/upgradeable/transpile-onto.sh ${{ github.ref_name }} origin/${{ github.ref_name }}
+        env:
+          SUBMODULE_REMOTE: https://github.com/${{ github.repository }}.git
       - run: git push origin ${{ github.ref_name }}

.gitignore

@@ -29,15 +29,9 @@ npm-debug.log
 # local env variables
 .env
 
-# truffle build directory
-build/
-
 # macOS
 .DS_Store
 
-# truffle
-.node-xmlhttprequest-*
-
 # IntelliJ IDE
 .idea
 
@@ -63,6 +57,7 @@ contracts-exposed
 
 # Foundry
 /out
+/cache_forge
 
 # Certora
 .certora*

.gitmodules

@@ -1,7 +1,9 @@
-[submodule "lib/forge-std"]
-	branch = v1
-	path = lib/forge-std
-	url = https://github.com/foundry-rs/forge-std
 [submodule "lib/erc4626-tests"]
 	path = lib/erc4626-tests
 	url = https://github.com/a16z/erc4626-tests.git
+[submodule "lib/halmos-cheatcodes"]
+	path = lib/halmos-cheatcodes
+	url = https://github.com/a16z/halmos-cheatcodes
+[submodule "lib/forge-std"]
+	path = lib/forge-std
+	url = https://github.com/foundry-rs/forge-std

.prettierrc

@@ -10,5 +10,6 @@
         "singleQuote": false
       }
     }
-  ]
+  ],
+  "plugins": ["prettier-plugin-solidity"]
 }

.solhint.json

@@ -1,14 +0,0 @@
-{
-  "rules": {
-    "no-unused-vars": "error",
-    "const-name-snakecase": "error",
-    "contract-name-camelcase": "error",
-    "event-name-camelcase": "error",
-    "func-name-mixedcase": "error",
-    "func-param-name-mixedcase": "error",
-    "modifier-name-mixedcase": "error",
-    "private-vars-leading-underscore": "error",
-    "var-name-mixedcase": "error",
-    "imports-on-top": "error"
-  }
-}

CHANGELOG.md

@@ -2,6 +2,365 @@
 
 ### Breaking changes
 
+- `ERC1967Utils`: Removed duplicate declaration of the `Upgraded`, `AdminChanged` and `BeaconUpgraded` events. These events are still available through the `IERC1967` interface located under the `contracts/interfaces/` directory. Minimum pragma version is now 0.8.21.
+- `Governor`, `GovernorCountingSimple`: The `_countVotes` virtual function now returns an `uint256` with the total votes casted. This change allows for more flexibility for partial and fractional voting. Upgrading users may get a compilation error that can be fixed by adding a return statement to the `_countVotes` function.
+
+### Custom error changes
+
+This version comes with changes to the custom error identifiers. Contracts previously depending on the following errors should be replaced accordingly:
+
+- Replace `Address.FailedInnerCall` with `Errors.FailedCall`
+- Replace `Address.AddressInsufficientBalance` with `Errors.InsufficientBalance`
+- Replace `Clones.Create2InsufficientBalance` with `Errors.InsufficientBalance`
+- Replace `Clones.ERC1167FailedCreateClone` with `Errors.FailedDeployment`
+- Replace `Clones.Create2FailedDeployment` with `Errors.FailedDeployment`
+- `SafeERC20`: Replace `Address.AddressEmptyCode` with `SafeERC20FailedOperation` if there is no code at the token's address.
+- `SafeERC20`: Replace generic `Error(string)` with `SafeERC20FailedOperation` if the returned data can't be decoded as `bool`.
+- `SafeERC20`: Replace generic `SafeERC20FailedOperation` with the revert message from the contract call if it fails.
+
+## 5.0.2 (2024-02-29)
+
+- `Base64`: Fix issue where dirty memory located just after the input buffer is affecting the result. ([#4926](https://github.com/OpenZeppelin/openzeppelin-contracts/pull/4926))
+
+## 5.0.1 (2023-12-07)
+
+- `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`.
+
+## 5.0.0 (2023-10-05)
+
+### 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](https://wizard.openzeppelin.com/)
+
+These removals were implemented in the following PRs: [#3637](https://github.com/OpenZeppelin/openzeppelin-contracts/pull/3637), [#3880](https://github.com/OpenZeppelin/openzeppelin-contracts/pull/3880), [#3945](https://github.com/OpenZeppelin/openzeppelin-contracts/pull/3945), [#4258](https://github.com/OpenZeppelin/openzeppelin-contracts/pull/4258), [#4276](https://github.com/OpenZeppelin/openzeppelin-contracts/pull/4276), [#4289](https://github.com/OpenZeppelin/openzeppelin-contracts/pull/4289)
+
+### Changes by category
+
+#### General
+
+- Replaced revert strings and require statements with custom errors. ([#4261](https://github.com/OpenZeppelin/openzeppelin-contracts/pull/4261))
+- Bumped minimum compiler version required to 0.8.20 ([#4288](https://github.com/OpenZeppelin/openzeppelin-contracts/pull/4288), [#4489](https://github.com/OpenZeppelin/openzeppelin-contracts/pull/4489))
+- Use of `abi.encodeCall` in place of `abi.encodeWithSelector` and `abi.encodeWithSignature` for improved type-checking of parameters ([#4293](https://github.com/OpenZeppelin/openzeppelin-contracts/pull/4293))
+- Replaced some uses of `abi.encodePacked` with clearer alternatives (e.g. `bytes.concat`, `string.concat`). ([#4504](https://github.com/OpenZeppelin/openzeppelin-contracts/pull/4504)) ([#4296](https://github.com/OpenZeppelin/openzeppelin-contracts/pull/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](https://github.com/OpenZeppelin/openzeppelin-contracts/pull/4299))
+- Removed the `override` specifier from functions that only override a single interface function. ([#4315](https://github.com/OpenZeppelin/openzeppelin-contracts/pull/4315))
+- Switched to using explicit Solidity import statements. Some previously available symbols may now have to be separately imported. ([#4399](https://github.com/OpenZeppelin/openzeppelin-contracts/pull/4399))
+- `Governor`, `Initializable`, and `UUPSUpgradeable`: Use internal functions in modifiers to optimize bytecode size. ([#4472](https://github.com/OpenZeppelin/openzeppelin-contracts/pull/4472))
+- Upgradeable contracts now use namespaced storage (EIP-7201). ([#4534](https://github.com/OpenZeppelin/openzeppelin-contracts/pull/4534))
+- Upgradeable contracts no longer transpile interfaces and libraries. ([#4628](https://github.com/OpenZeppelin/openzeppelin-contracts/pull/4628))
+
+#### Access
+
+- `Ownable`: Added an `initialOwner` parameter to the constructor, making the ownership initialization explicit. ([#4267](https://github.com/OpenZeppelin/openzeppelin-contracts/pull/4267))
+- `Ownable`: Prevent using address(0) as the initial owner. ([#4531](https://github.com/OpenZeppelin/openzeppelin-contracts/pull/4531))
+- `AccessControl`: Added a boolean return value to the internal `_grantRole` and `_revokeRole` functions indicating whether the role was granted or revoked. ([#4241](https://github.com/OpenZeppelin/openzeppelin-contracts/pull/4241))
+- `access`: Moved `AccessControl` extensions to a dedicated directory. ([#4359](https://github.com/OpenZeppelin/openzeppelin-contracts/pull/4359))
+- `AccessManager`: Added a new contract for managing access control of complex systems in a consolidated location. ([#4121](https://github.com/OpenZeppelin/openzeppelin-contracts/pull/4121))
+- `AccessManager`, `AccessManaged`, `GovernorTimelockAccess`: Ensure that calldata shorter than 4 bytes is not padded to 4 bytes. ([#4624](https://github.com/OpenZeppelin/openzeppelin-contracts/pull/4624))
+- `AccessManager`: Use named return parameters in functions that return multiple values. ([#4624](https://github.com/OpenZeppelin/openzeppelin-contracts/pull/4624))
+- `AccessManager`: Make `schedule` and `execute` more conservative when delay is 0. ([#4644](https://github.com/OpenZeppelin/openzeppelin-contracts/pull/4644))
+
+#### Finance
+
+- `VestingWallet`: Fixed revert during 1 second time window when duration is 0. ([#4502](https://github.com/OpenZeppelin/openzeppelin-contracts/pull/4502))
+- `VestingWallet`: Use `Ownable` instead of an immutable `beneficiary`. ([#4508](https://github.com/OpenZeppelin/openzeppelin-contracts/pull/4508))
+
+#### Governance
+
+- `Governor`: Optimized use of storage for proposal data ([#4268](https://github.com/OpenZeppelin/openzeppelin-contracts/pull/4268))
+- `Governor`: Added validation in ERC1155 and ERC721 receiver hooks to ensure Governor is the executor. ([#4314](https://github.com/OpenZeppelin/openzeppelin-contracts/pull/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](https://github.com/OpenZeppelin/openzeppelin-contracts/pull/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](https://github.com/OpenZeppelin/openzeppelin-contracts/pull/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](https://github.com/OpenZeppelin/openzeppelin-contracts/pull/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](https://github.com/OpenZeppelin/openzeppelin-contracts/pull/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](https://github.com/OpenZeppelin/openzeppelin-contracts/pull/4523))
+- `GovernorTimelockControl`: Clean up timelock id on execution for gas refund. ([#4118](https://github.com/OpenZeppelin/openzeppelin-contracts/pull/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](https://github.com/OpenZeppelin/openzeppelin-contracts/pull/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](https://github.com/OpenZeppelin/openzeppelin-contracts/pull/3799))
+- `TimelockController`: Added a state getter that returns an `OperationState` enum. ([#4358](https://github.com/OpenZeppelin/openzeppelin-contracts/pull/4358))
+- `Votes`: Use Trace208 for checkpoints. This enables EIP-6372 clock support for keys but reduces the max supported voting power to uint208. ([#4539](https://github.com/OpenZeppelin/openzeppelin-contracts/pull/4539))
+
+#### Metatx
+
+- `ERC2771Forwarder`: Added `deadline` for expiring transactions, batching, and more secure handling of `msg.value`. ([#4346](https://github.com/OpenZeppelin/openzeppelin-contracts/pull/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](https://github.com/OpenZeppelin/openzeppelin-contracts/pull/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](https://github.com/OpenZeppelin/openzeppelin-contracts/pull/4484))
+
+#### Proxy
+
+- `ProxyAdmin`: Removed `getProxyAdmin` and `getProxyImplementation` getters. ([#3820](https://github.com/OpenZeppelin/openzeppelin-contracts/pull/3820))
+- `TransparentUpgradeableProxy`: Removed `admin` and `implementation` getters, which were only callable by the proxy owner and thus not very useful. ([#3820](https://github.com/OpenZeppelin/openzeppelin-contracts/pull/3820))
+- `ERC1967Utils`: Refactored the `ERC1967Upgrade` abstract contract as a library. ([#4325](https://github.com/OpenZeppelin/openzeppelin-contracts/pull/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](https://github.com/OpenZeppelin/openzeppelin-contracts/pull/4354))
+- Moved the logic to validate ERC-1822 during an upgrade from `ERC1967Utils` to `UUPSUpgradeable`. ([#4356](https://github.com/OpenZeppelin/openzeppelin-contracts/pull/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](https://github.com/OpenZeppelin/openzeppelin-contracts/pull/4382))
+- `BeaconProxy`: Reject value in initialization unless a payable function is explicitly invoked. ([#4382](https://github.com/OpenZeppelin/openzeppelin-contracts/pull/4382))
+- `Proxy`: Removed redundant `receive` function. ([#4434](https://github.com/OpenZeppelin/openzeppelin-contracts/pull/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](https://github.com/OpenZeppelin/openzeppelin-contracts/pull/4435))
+- `Initializable`: Use the namespaced storage pattern to avoid putting critical variables in slot 0. Allow reinitializer versions greater than 256. ([#4460](https://github.com/OpenZeppelin/openzeppelin-contracts/pull/4460))
+- `Initializable`: Use intermediate variables to improve readability. ([#4576](https://github.com/OpenZeppelin/openzeppelin-contracts/pull/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](https://github.com/OpenZeppelin/openzeppelin-contracts/pull/3838), [#3876](https://github.com/OpenZeppelin/openzeppelin-contracts/pull/3876), [#4377](https://github.com/OpenZeppelin/openzeppelin-contracts/pull/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](https://github.com/OpenZeppelin/openzeppelin-contracts/pull/4370))
+- `ERC20`: Removed the non-standard `increaseAllowance` and `decreaseAllowance` functions. ([#4585](https://github.com/OpenZeppelin/openzeppelin-contracts/pull/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](https://github.com/OpenZeppelin/openzeppelin-contracts/pull/3816))
+- `SafeERC20`: Refactored `safeDecreaseAllowance` and `safeIncreaseAllowance` to support USDT-like tokens. ([#4260](https://github.com/OpenZeppelin/openzeppelin-contracts/pull/4260))
+- `SafeERC20`: Removed `safePermit` in favor of documentation-only `permit` recommendations. Based on recommendations from @trust1995 ([#4582](https://github.com/OpenZeppelin/openzeppelin-contracts/pull/4582))
+- `ERC721`: `_approve` no longer allows approving the owner of the tokenId. ([#4377](https://github.com/OpenZeppelin/openzeppelin-contracts/issues/4377)) `_setApprovalForAll` no longer allows setting address(0) as an operator. ([#4377](https://github.com/OpenZeppelin/openzeppelin-contracts/pull/4377))
+- `ERC721`: Renamed `_requireMinted` to `_requireOwned` and added a return value with the current owner. Implemented `ownerOf` in terms of `_requireOwned`. ([#4566](https://github.com/OpenZeppelin/openzeppelin-contracts/pull/4566))
+- `ERC721Consecutive`: Added a `_firstConsecutiveId` internal function that can be overridden to change the id of the first token minted through `_mintConsecutive`. ([#4097](https://github.com/OpenZeppelin/openzeppelin-contracts/pull/4097))
+- `ERC721URIStorage`: Allow setting the token URI prior to minting. ([#4559](https://github.com/OpenZeppelin/openzeppelin-contracts/pull/4559))
+- `ERC721URIStorage`, `ERC721Royalty`: Stop resetting token-specific URI and royalties when burning. ([#4561](https://github.com/OpenZeppelin/openzeppelin-contracts/pull/4561))
+- `ERC1155`: Optimized array allocation. ([#4196](https://github.com/OpenZeppelin/openzeppelin-contracts/pull/4196))
+- `ERC1155`: Removed check for address zero in `balanceOf`. ([#4263](https://github.com/OpenZeppelin/openzeppelin-contracts/pull/4263))
+- `ERC1155`: Optimized array accesses by skipping bounds checking when unnecessary. ([#4300](https://github.com/OpenZeppelin/openzeppelin-contracts/pull/4300))
+- `ERC1155`: Bubble errors triggered in the `onERC1155Received` and `onERC1155BatchReceived` hooks. ([#4314](https://github.com/OpenZeppelin/openzeppelin-contracts/pull/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](https://github.com/OpenZeppelin/openzeppelin-contracts/pull/3962))
+- `ERC1155Receiver`: Removed in favor of `ERC1155Holder`. ([#4450](https://github.com/OpenZeppelin/openzeppelin-contracts/pull/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](https://github.com/OpenZeppelin/openzeppelin-contracts/pull/4502))
+- `Arrays`: Added `unsafeMemoryAccess` helpers to read from a memory array without checking the length. ([#4300](https://github.com/OpenZeppelin/openzeppelin-contracts/pull/4300))
+- `Arrays`: Optimized `findUpperBound` by removing redundant SLOAD. ([#4442](https://github.com/OpenZeppelin/openzeppelin-contracts/pull/4442))
+- `Checkpoints`: Library moved from `utils` to `utils/structs` ([#4275](https://github.com/OpenZeppelin/openzeppelin-contracts/pull/4275))
+- `DoubleEndedQueue`: Refactored internal structure to use `uint128` instead of `int128`. This has no effect on the library interface. ([#4150](https://github.com/OpenZeppelin/openzeppelin-contracts/pull/4150))
+- `ECDSA`: Use unchecked arithmetic for the `tryRecover` function that receives the `r` and `vs` short-signature fields separately. ([#4301](https://github.com/OpenZeppelin/openzeppelin-contracts/pull/4301))
+- `EIP712`: Added internal getters for the name and version strings ([#4303](https://github.com/OpenZeppelin/openzeppelin-contracts/pull/4303))
+- `Math`: Makes `ceilDiv` to revert on 0 division even if the numerator is 0 ([#4348](https://github.com/OpenZeppelin/openzeppelin-contracts/pull/4348))
+- `Math`: Optimized stack operations in `mulDiv`. ([#4494](https://github.com/OpenZeppelin/openzeppelin-contracts/pull/4494))
+- `Math`: Renamed members of `Rounding` enum, and added a new rounding mode for "away from zero". ([#4455](https://github.com/OpenZeppelin/openzeppelin-contracts/pull/4455))
+- `MerkleProof`: Use custom error to report invalid multiproof instead of reverting with overflow panic. ([#4564](https://github.com/OpenZeppelin/openzeppelin-contracts/pull/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](https://github.com/OpenZeppelin/openzeppelin-contracts/pull/4430))
+- `Nonces`: Added a new contract to keep track of user nonces. Used for signatures in `ERC20Permit`, `ERC20Votes`, and `ERC721Votes`. ([#3816](https://github.com/OpenZeppelin/openzeppelin-contracts/pull/3816))
+- `ReentrancyGuard`, `Pausable`: Moved to `utils` directory. ([#4551](https://github.com/OpenZeppelin/openzeppelin-contracts/pull/4551))
+- `Strings`: Renamed `toString(int256)` to `toStringSigned(int256)`. ([#4330](https://github.com/OpenZeppelin/openzeppelin-contracts/pull/4330))
+- Optimized `Strings.equal` ([#4262](https://github.com/OpenZeppelin/openzeppelin-contracts/pull/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.
+
+```diff
+-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:
+
+```solidity
+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`.
+
+```diff
+- 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](https://forum.openzeppelin.com/c/support/contracts/18).
+
+#### 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:
+
+```diff
+ 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:
+
+```diff
+ // 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.
+
+## 4.9.6 (2024-02-29)
+
+- `Base64`: Fix issue where dirty memory located just after the input buffer is affecting the result. ([#4929](https://github.com/OpenZeppelin/openzeppelin-contracts/pull/4929))
+
+## 4.9.5 (2023-12-08)
+
+- `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).
+
+## 4.9.3 (2023-07-28)
+
+- `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](https://github.com/OpenZeppelin/openzeppelin-contracts/pull/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](https://github.com/OpenZeppelin/openzeppelin-contracts/pull/4484))
+
+## 4.9.2 (2023-06-16)
+
+- `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.
+
+## 4.9.1 (2023-06-07)
+
+- `Governor`: Add a mechanism to restrict the address of the proposer using a suffix in the description.
+
+## 4.9.0 (2023-05-23)
+
+- `ReentrancyGuard`: Add a `_reentrancyGuardEntered` function to expose the guard status. ([#3714](https://github.com/OpenZeppelin/openzeppelin-contracts/pull/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](https://github.com/OpenZeppelin/openzeppelin-contracts/pull/3863))
+- `EnumerableMap`: add a `keys()` function that returns an array containing all the keys. ([#3920](https://github.com/OpenZeppelin/openzeppelin-contracts/pull/3920))
+- `Governor`: add a public `cancel(uint256)` function. ([#3983](https://github.com/OpenZeppelin/openzeppelin-contracts/pull/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](https://github.com/OpenZeppelin/openzeppelin-contracts/pull/3934))
+- `Strings`: add `equal` method. ([#3774](https://github.com/OpenZeppelin/openzeppelin-contracts/pull/3774))
+- `IERC5313`: Add an interface for EIP-5313 that is now final. ([#4013](https://github.com/OpenZeppelin/openzeppelin-contracts/pull/4013))
+- `IERC4906`: Add an interface for ERC-4906 that is now Final. ([#4012](https://github.com/OpenZeppelin/openzeppelin-contracts/pull/4012))
+- `StorageSlot`: Add support for `string` and `bytes`. ([#4008](https://github.com/OpenZeppelin/openzeppelin-contracts/pull/4008))
+- `Votes`, `ERC20Votes`, `ERC721Votes`: support timestamp checkpointing using EIP-6372. ([#3934](https://github.com/OpenZeppelin/openzeppelin-contracts/pull/3934))
+- `ERC4626`: Add mitigation to the inflation attack through virtual shares and assets. ([#3979](https://github.com/OpenZeppelin/openzeppelin-contracts/pull/3979))
+- `Strings`: add `toString` method for signed integers. ([#3773](https://github.com/OpenZeppelin/openzeppelin-contracts/pull/3773))
+- `ERC20Wrapper`: Make the `underlying` variable private and add a public accessor. ([#4029](https://github.com/OpenZeppelin/openzeppelin-contracts/pull/4029))
+- `EIP712`: add EIP-5267 support for better domain discovery. ([#3969](https://github.com/OpenZeppelin/openzeppelin-contracts/pull/3969))
+- `AccessControlDefaultAdminRules`: Add an extension of `AccessControl` with additional security rules for the `DEFAULT_ADMIN_ROLE`. ([#4009](https://github.com/OpenZeppelin/openzeppelin-contracts/pull/4009))
+- `SignatureChecker`: Add `isValidERC1271SignatureNow` for checking a signature directly against a smart contract using ERC-1271. ([#3932](https://github.com/OpenZeppelin/openzeppelin-contracts/pull/3932))
+- `SafeERC20`: Add a `forceApprove` function to improve compatibility with tokens behaving like USDT. ([#4067](https://github.com/OpenZeppelin/openzeppelin-contracts/pull/4067))
+- `ERC1967Upgrade`: removed contract-wide `oz-upgrades-unsafe-allow delegatecall` annotation, replaced by granular annotation in `UUPSUpgradeable`. ([#3971](https://github.com/OpenZeppelin/openzeppelin-contracts/pull/3971))
+- `ERC20Wrapper`: self wrapping and deposit by the wrapper itself are now explicitly forbidden. ([#4100](https://github.com/OpenZeppelin/openzeppelin-contracts/pull/4100))
+- `ECDSA`: optimize bytes32 computation by using assembly instead of `abi.encodePacked`. ([#3853](https://github.com/OpenZeppelin/openzeppelin-contracts/pull/3853))
+- `ERC721URIStorage`: Emit ERC-4906 `MetadataUpdate` in `_setTokenURI`. ([#4012](https://github.com/OpenZeppelin/openzeppelin-contracts/pull/4012))
+- `ShortStrings`: Added a library for handling short strings in a gas efficient way, with fallback to storage for longer strings. ([#4023](https://github.com/OpenZeppelin/openzeppelin-contracts/pull/4023))
+- `SignatureChecker`: Allow return data length greater than 32 from EIP-1271 signers. ([#4038](https://github.com/OpenZeppelin/openzeppelin-contracts/pull/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](https://github.com/OpenZeppelin/openzeppelin-contracts/pull/3971))
+- `Initializable`: optimize `_disableInitializers` by using `!=` instead of `<`. ([#3787](https://github.com/OpenZeppelin/openzeppelin-contracts/pull/3787))
+- `Ownable2Step`: make `acceptOwnership` public virtual to enable usecases that require overriding it. ([#3960](https://github.com/OpenZeppelin/openzeppelin-contracts/pull/3960))
+- `UUPSUpgradeable.sol`: Change visibility to the functions `upgradeTo ` and `upgradeToAndCall ` from `external` to `public`. ([#3959](https://github.com/OpenZeppelin/openzeppelin-contracts/pull/3959))
+- `TimelockController`: Add the `CallSalt` event to emit on operation schedule. ([#4001](https://github.com/OpenZeppelin/openzeppelin-contracts/pull/4001))
+- Reformatted codebase with latest version of Prettier Solidity. ([#3898](https://github.com/OpenZeppelin/openzeppelin-contracts/pull/3898))
+- `Math`: optimize `log256` rounding check. ([#3745](https://github.com/OpenZeppelin/openzeppelin-contracts/pull/3745))
+- `ERC20Votes`: optimize by using unchecked arithmetic. ([#3748](https://github.com/OpenZeppelin/openzeppelin-contracts/pull/3748))
+- `Multicall`: annotate `multicall` function as upgrade safe to not raise a flag for its delegatecall. ([#3961](https://github.com/OpenZeppelin/openzeppelin-contracts/pull/3961))
+- `ERC20Pausable`, `ERC721Pausable`, `ERC1155Pausable`: Add note regarding missing public pausing functionality ([#4007](https://github.com/OpenZeppelin/openzeppelin-contracts/pull/4007))
+- `ECDSA`: Add a function `toDataWithIntendedValidatorHash` that encodes data with version 0x00 following EIP-191. ([#4063](https://github.com/OpenZeppelin/openzeppelin-contracts/pull/4063))
+- `MerkleProof`: optimize by using unchecked arithmetic. ([#3745](https://github.com/OpenZeppelin/openzeppelin-contracts/pull/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.
 
@@ -325,7 +684,7 @@ It is no longer possible to call an `initializer`-protected function from within
 This release includes two small breaking changes in `TimelockController`.
 
 1. The `onlyRole` modifier in this contract was designed to let anyone through if the role was granted to `address(0)`,
-   allowing the possibility to to make a role "open", which can be used for `EXECUTOR_ROLE`. This modifier is now
+   allowing the possibility to make a role "open", which can be used for `EXECUTOR_ROLE`. This modifier is now
    replaced by `AccessControl.onlyRole`, which does not have this ability. The previous behavior was moved to the
    modifier `TimelockController.onlyRoleOrOpenRole`.
 2. It was possible to make `PROPOSER_ROLE` an open role (as described in the previous item) if it was granted to

CODE_OF_CONDUCT.md

@@ -6,7 +6,7 @@ In the interest of fostering an open and welcoming environment, we as
 contributors and maintainers pledge to making participation in our project and
 our community a harassment-free experience for everyone, regardless of age, body
 size, disability, ethnicity, sex characteristics, gender identity and expression,
-level of experience, education, socio-economic status, nationality, personal
+level of experience, education, socioeconomic status, nationality, personal
 appearance, race, religion, or sexual identity and orientation.
 
 ## Our Standards

FUNDING.json

@@ -0,0 +1,7 @@
+{
+  "drips": {
+    "ethereum": {
+      "ownedBy": "0xAeb37910f93486C85A1F8F994b67E8187554d664"
+    }
+  }
+}

GUIDELINES.md

@@ -95,8 +95,18 @@ In addition to the official Solidity Style Guide we have a number of other conve
   }
   ```
 
-* Events should be emitted immediately after the state change that they
-  represent, and should be named in the past tense.
+* Functions should be declared virtual, with few exceptions listed below. The
+  contract logic should be written considering that these functions may be
+  overridden by developers, e.g. getting a value using an internal getter rather
+  than reading directly from a state variable.
+
+  If function A is an "alias" of function B, i.e. it invokes function B without
+  significant additional logic, then function A should not be virtual so that
+  any user overrides are implemented on B, preventing inconsistencies.
+
+* Events should generally be emitted immediately after the state change that they
+  represent, and should be named in the past tense. Some exceptions may be made for gas
+  efficiency if the result doesn't affect observable ordering of events.
 
   ```solidity
   function _burn(address who, uint256 value) internal {
@@ -105,7 +115,7 @@ In addition to the official Solidity Style Guide we have a number of other conve
   }
   ```
 
-  Some standards (e.g. ERC20) use present tense, and in those cases the
+  Some standards (e.g. ERC-20) use present tense, and in those cases the
   standard specification is used.
   
 * Interface names should have a capital I prefix.
@@ -114,4 +124,25 @@ In addition to the official Solidity Style Guide we have a number of other conve
   interface IERC777 {
   ```
 
+* Contracts not intended to be used standalone should be marked abstract
+  so they are required to be inherited to other contracts.
+
+  ```solidity
+  abstract contract AccessControl is ..., {
+  ```
+
 * Unchecked arithmetic blocks should contain comments explaining why overflow is guaranteed not to happen. If the reason is immediately apparent from the line above the unchecked block, the comment may be omitted.
+
+* Custom errors should be declared following the [EIP-6093](https://eips.ethereum.org/EIPS/eip-6093) rationale whenever reasonable. Also, consider the following:
+  
+  * The domain prefix should be picked in the following order:
+    1. Use `ERC<number>` if the error is a violation of an ERC specification.
+    2. Use the name of the underlying component where it belongs (eg. `Governor`, `ECDSA`, or `Timelock`).
+
+  * The location of custom errors should be decided in the following order:
+    1. Take the errors from their underlying ERCs if they're already defined.
+    2. Declare the errors in the underlying interface/library if the error makes sense in its context.
+    3. Declare the error in the implementation if the underlying interface/library is not suitable to do so (eg. interface/library already specified in an ERC).
+    4. Declare the error in an extension if the error only happens in such extension or child contracts.
+
+  * Custom error names should not be declared twice along the library to avoid duplicated identifier declarations when inheriting from multiple contracts.

LICENSE

@@ -1,6 +1,6 @@
 The MIT License (MIT)
 
-Copyright (c) 2016-2023 zOS Global Limited and contributors
+Copyright (c) 2016-2024 Zeppelin Group Ltd
 
 Permission is hereby granted, free of charge, to any person obtaining
 a copy of this software and associated documentation files (the