EIP-7954: Increase Maximum Contract Size

Raise the maximum contract code size from 24KiB to 32KiB and initcode size from 48KiB to 64KiB.

Metadata

Status: DraftStandards Track: CoreCreated: 2025-06-09

Authors

Giulio Rebuffo (@Giulio2002), Ben Adams (@badams)

Requires

EIP-170, EIP-3860

Links

GitHub page Discussion on Ethereum Magicians

Abstract

This EIP proposes to raise the maximum allowed size for contract code deployed on Ethereum from 24,576 bytes to 32,768 bytes.

Motivation

The current 24KiB contract size limit can be restrictive for complex contracts and applications. Increasing the limit to 32KiB allows for more feature-rich contracts while maintaining reasonable constraints on block and state growth.

Specification

Update the EIP-170 contract code size limit of 24KiB (0x6000 bytes) to 32KiB (0x8000 bytes).
Update the EIP-3860 initcode size limit of 48KiB (0xC000 bytes) to 64KiB (0x10000 bytes).

Rationale

Developer Flexibility: Enables more complex contracts and features.
Backward Compatibility: Existing contracts are unaffected.
Simplicity: Only the size limit is changed, with no other protocol modifications.

Backwards Compatibility

This change is not backwards compatible and must be activated via a network upgrade (hard fork). Contracts larger than 24KiB, up to 32KiB, will be deployable after activation.

Security Considerations

A higher contract size limit may marginally increase the risk of denial-of-service attacks via large contracts, but the new limit remains conservative.

Copyright