Banteg introduced a new tool called vyupgrade, designed to automatically rewrites Vyper smart contracts to modern syntax, then validates the migration is safe. Vyper is the second most popular smart contract programming language used by Ethereum developers. After rewriting the contracts, vyupgrade compiles both the original and the updated version and checks that the ABI, method identifiers, and storage layout are identical.

The tool covers all syntax changes from Vyper 0.2.1 through 0.4.3, with support for dependencies and modules including snekmate. The tool addresses contracts written in older versions of Vyper that won't compile under newer versions without a manual update. Where a rewrite cannot be proven safe, vyupgrade flags it for manual review instead of applying it automatically.

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The Solidity team released version 0.8.35 of the Solidity compiler, delivering new language features, an experimental codegen pipeline, and early warnings ahead of the upcoming 0.9.0 release. The headline feature is ERC-7201, Solidity's first compile-time builtin. It automatically computes the base storage slot for ERC-7201 namespaced storage layouts, eliminating the need for developers to hardcode values.

The release also issues deprecation warnings for identifiers that will become reserved keywords in the 0.9.0 release. Developers are encouraged to audit their codebases now to avoid breaking changes in the next release. Solidity is the most widely used language for developing smart contracts on the EVM, introduced in 2015 and continuously developed alongside the protocol's roadmap toward the Hegotá hardfork.

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