Nightly (2026-05-04)

Other

• chore(lint): add missing lints to README (#14551) by @mablr
• chore(bench): update benchmark.sh (#14548) by @mablr
• chore(clippy): fix workspace-wide clippy regressions (#14554) by @stevencartavia
• fix(ci): use PATH_USD fallback fee token in Mail templates (#14546) by @mablr
• chore(deps): bump the actions-weekly group with 3 updates (#14497) by @dependabot[bot]
• refactor(chisel): migrate to solar (#14532) by @mablr

Full Changelog:

nightly-a5b7cc8da131956513da478f9fa99d2e0e29419d...nightly-58e0595f3533074705d2057ffe183dbf86b08c3e

Nightly (2026-05-03)

Other

• anvil: unify Tempo nonce markers across send RPCs (#14536) by @isagi-y22
• fix(forge): flaky_gas_report_fallback_with_calldata deployment cost (#14545) by @mablr

Full Changelog:

nightly-415cef0d0730270402e24d0a30d5c086a7a240b1...nightly-a5b7cc8da131956513da478f9fa99d2e0e29419d

Nightly (2026-05-01)

Other

• feat(lint): detect boolean constant misuse (#14489) by @figtracer
• feat(lint): add could-be-immutable lint (#14495) by @figtracer
• chore: bump compiler version to 0.8.35 for tests (#14524) by @zerosnacks
• chore: update codeowners (#14529) by @onbjerg
• feat(lint): add unused-state-variable (#14483) by @mablr
• chore(ci): re-enable Tempo devnet in CI, make Tempo testnet and mainnet a nightly check (#14501) by @zerosnacks
• feat(lint): add rtlo lint (#14499) by @stevencartavia
• feat(forge): use network = "tempo" and add rpc_endpoints in tempo template (#14528) by @zerosnacks
• ci(tempo): also run devnet checks on push to master (#14537) by @zerosnacks
• fix(config): suppress spurious unknown-key warning for network (#14534) by @zerosnacks
• test(fmt): cover erc7201 layout formatting (#14519) by @decofe
• perf(forge): avoid unnecessary gas_snapshots clones (#13969) by @ArshLabs

Full Changelog:

nightly-233324ea3161d971459ac9ef86fb5af4e7aa711e...nightly-415cef0d0730270402e24d0a30d5c086a7a240b1

Nightly (2026-04-30)

Other

• chore(lint): move low-severity lints to low/ (#14500) by @stevencartavia
• fix(ext): bump forge-std commit in external integration tests (#14504) by @zerosnacks
• fix(foundryup): sort nightly releases chronologically before picking latest (#14507) by @zerosnacks
• feat(doc): migrate from solang to solar (#14447) by @mablr
• fix(cheatcodes): fix solc 0.8.35 error keyword warning (#14509) by @figtracer
• chore(tests): bump forge-std version (#14510) by @github-actions[bot]
• chore(ext): bump revs in external integration tests (#14506) by @zerosnacks

Full Changelog:

nightly-5864f675120ce4f619871f9001555bc387331120...nightly-233324ea3161d971459ac9ef86fb5af4e7aa711e

v1.7.0

Foundry v1.7.0

Foundry v1.7.0 brings major improvements to fuzzing and invariant testing, upstreams Tempo support into the main Foundry toolchain, adds support for HTTP 402-gated RPC endpoints through MPP, improves browser-wallet and batching workflows across Forge and Cast, and moves Foundry releases to an immutable versioning model.

v1.7.0 folds in the previously cut v1.6.0-rc1 release candidate, which never shipped as stable, together with the changes merged since.

Highlights

Testing & Fuzzing

• Parallelized stateless fuzzing across worker threads with shared corpus (#12713)
• Invariant check_interval config — deep invariant runs up to 3.6× faster with check_interval = 10 (#13133)
• Invariant optimization mode — search input sequences that maximize a target value, with realtime best-value tracking and persistence (#13196, #14147, #14226)
• Improved reentrancy detection in call_override invariant testing (#13127)
• Time-based invariant fuzzing via max_time_delay / max_block_delay configs (#12616)

Network Updates

• Osaka is the default EVM hardfork (#13112), with precompile decoding for Prague BLS12-381 and Osaka P256VERIFY (#13094)
• Per-network hardfork and network keys in foundry.toml (#14312, #14337), with auto-detection from a fork's chain ID (#14193)

Tempo

Tempo support has been upstreamed from the standalone tempoxyz/tempo-foundry fork into foundry-rs/foundry. The fork is deprecated; a normal foundryup install now ships Tempo support in forge, cast, anvil, and chisel.

This is 110 merged PRs spanning execution, RPC, transaction signing and validation, the AA/access-key flow, TIP20 fee tokens, cast keychain, forge create/script/test/coverage integration, Anvil genesis + pool + tracing, and CI. Notable entry points include:

• forge init --network tempo (#12819)
• cast keychain for Tempo access keys (#14166, #14222)
• cast tip20 create and TIP20 virtual address salt mining (#14160, #14365)
• --tempo.fee-token on forge script and cast send (#14204, #14184)
• Tempo network auto-detection on anvil --fork-url (#14279)

Full list in the Tempo section below.

MPP (Machine Payments Protocol)

Foundry now supports MPP (Machine Payments Protocol) for HTTP 402-gated RPC endpoints. When an RPC provider returns 402, Foundry signs and pays the challenge with the configured wallet, then retries the request — no API keys or upfront provisioning. A built-in URL mapping covers known providers, and a WebSocket transport handles long-lived subscriptions over paid connections (#14192, #14404, #14353).

Forge & Cast

• Browser wallet support across forge script (#12952), forge create (#14394), cast send (#13747), and cast erc20 (#14395) — sign and broadcast transactions directly from a browser wallet extension instead of provisioning a hot key on disk
• Realtime console.log in forge and chisel (#13321) and console.table support (#14338)
• forge inspect <x> linearization (#13704) makes it easier to inspect where inherited functions are resolved from
• forge clone Sourcify support (#12900)
• cast batch-send / batch-mktx for native call batching (#13973)
• cast --curl flag to print equivalent curl commands (#13114)

Cheatcodes & Lint

• New cheatcodes: executeTransaction (#13437), Ed25519 crypto (#13450), getRecordedLogsJson (#13093), currentFilePath (#13735)
• New forge-lint rules: incorrect ERC20 interface (#14428), incorrect ERC721 interface (#14412), block-timestamp (#14431), and custom errors (#13126). These catch incorrect ERC20/ERC721 interface implementations, timestamp-dependent logic, and custom-error usage issues.

---

Benchmarks

Live dashboard: getfoundry.sh/benchmarks

Headline wins per command, comparing v1.5.1 against the v1.7.0 release-cycle build:

Command	Repository	v1.5.1	v1.7.0	Delta
forge test	aave/aave-v4	4m 14.2s	3m 29.1s	~45s faster
forge fuzz	ithacaxyz/account	2.81s	1.59s	~1.8× faster
forge test --isolated	aave/aave-v4	4m 14.0s	3m 53.4s	~20s faster
forge coverage	aave/aave-v4	11m 20.8s	10m 58.7s	~22s faster

Raw data: benches/LATEST.md.

Performance-related features (22 PRs)

• perf: add dist profile for smaller release binaries (#13097) by @onbjerg
• perf: compute literals only once (#12716) by @DaniPopes
• perf: remove redundant allocation in receipt bloom calculation (#13035) by @marukai67
• perf(forge): skip external identifiers for local tests (#13189) by @gakonst
• perf(anvil): avoid redundant block queries in ots_getBlockTransactions (#13243) by @aganisgash
• perf(evm): wrap Executor.backend in Arc for copy-on-write cloning (#13327) by @gakonst
• perf(cheatcodes): loop invariant code motion by hand (#13357) by @cuiweixie
• perf(linking): replace double hash map lookup with single get (#13361) by @cuiweixie
• perf(anvil): reuse storage root from prove_storage instead of recomputing (#13363) by @thunggis
• perf(verify): reuse transaction from earlier RPC call instead of fetching twice (#13391) by @thunggis
• perf: avoid checksum (#13374) by @cuiweixie
• perf(invariant): avoid cloning state changeset in fuzz runs (#13398) by @thunggis
• perf(traces): deduplicate addresses before external fetching (#13320) by @marukai67
• perf(primitives): avoid cloning receipts (#13396) by @thunggis
• perf(config): skip redundant remapping detection in _with_root (#13389) by @0xMars42
• perf(anvil): avoid redundant cloning and hash recomputation in mem backend (#13744) by @edgarr1986
• perf(anvil): remove redundant clone in create_access_list (#13887) by @edgarr1986
• perf(evm): make NestedEvm::to_evm_env consuming to avoid useless clone (#13893) by @mablr
• perf(evm): remove unnecessary clones in do_call_end/do_create_end (#13913) by @figtracer
• perf(evm): remove EvmEnv/TxEnv cloning in DBs & CheatcodesExecutor impls (#13960) by @mablr
• perf(traces): skip precompile addresses in identify_addresses (#14198) by @decofe
• feat: make asm-keccak a default feature in all binaries (#14389) by @DaniPopes

---

Breaking / Behavior Changes

• forge and anvil now default to Osaka ([#13112](ht...

Nightly (2026-04-28)

Other

• chore(cli): make Git impl more robust (#14452) by @mablr
• fix(ci): aave v4 pinned on latest (#14474) by @mablr
• ci: prefer direct-key credentials for MPP e2e (#14472) by @brendanjryan
• fix: < to <= in validate_uint_mutation (#14459) by @cuiweixie
• ci(tempo): run testnet on PRs (#14479) by @zerosnacks
• feat: immutable releases (#14445) by @zerosnacks
• Improve CI action (#14484) by @grandizzy
• fix(config): warn instead of erroring on unknown FOUNDRY_PROFILE (#14486) by @zerosnacks

Full Changelog:

nightly-5e88010a83d1b87b8f4d13058e42a2949d3e9dc0...nightly-88c854987f2e9c8df31756546eeec710fa5bc88f

Nightly (2026-04-29)

Other

• fix(anvil): pre-check Tempo valid_after before execution (#14469) by @Perico-perica46
• feat(lint): add missing-zero-check (#14460) by @stevencartavia
• chore: bump Tempo deps + test tempo_forkSchedule (#14485) by @0xrusowsky
• fix(anvil): miner forced-tx deadlock (#14453) by @isagi-y22

Full Changelog:

nightly-88c854987f2e9c8df31756546eeec710fa5bc88f...nightly-5864f675120ce4f619871f9001555bc387331120

Nightly (2026-04-28)

Other

• fix(forge): adjust gas assertion CounterWithFallback (#14465) by @mablr
• chore: update latest benchmarks (#14467) by @mablr
• ci: split MPP e2e into its own workflow (#14468) by @zerosnacks
• Improve GH actions (#14473) by @grandizzy
• fix(benches): add repos + extra args support to prevent blocking errors (#14470) by @mablr

Full Changelog:

nightly...nightly-5e88010a83d1b87b8f4d13058e42a2949d3e9dc0

Nightly

Other

• fix(forge): adjust gas assertion CounterWithFallback (#14465) by @mablr
• chore: update latest benchmarks (#14467) by @mablr
• ci: split MPP e2e into its own workflow (#14468) by @zerosnacks
• Improve GH actions (#14473) by @grandizzy
• fix(benches): add repos + extra args support to prevent blocking errors (#14470) by @mablr

Full Changelog:

nightly...nightly-5e88010a83d1b87b8f4d13058e42a2949d3e9dc0

Nightly (2026-04-27)

• No changes