---
eip: 7954
title: Increase Maximum Contract Size
description: Raise the maximum contract code size from 24KiB to 64KiB and initcode size from 48KiB to 128KiB.
author: Giulio Rebuffo (@Giulio2002), Ben Adams (@benaadams)
discussions-to: https://ethereum-magicians.org/t/increase-maximum-contract-size-to-48kb/24509
status: Draft
type: Standards Track
category: Core
created: 2025-06-09
requires: 170, 3860
---

## Abstract

This EIP proposes to raise the maximum allowed size for contract code deployed on Ethereum from 24,576 bytes to 65,536 bytes, and to raise the initcode size limit from 49,152 bytes to 131,072 bytes.

## Motivation

The current 24KiB contract size limit can be restrictive for complex contracts and applications. Increasing the limit to 64KiB allows for more feature-rich contracts while maintaining reasonable constraints on block and state growth.

## Specification

1. Update the [EIP-170](./eip-170.md) contract code size limit of 24KiB (`0x6000` bytes) to 64KiB (`0x10000` bytes).
2. Update the [EIP-3860](./eip-3860.md) initcode size limit of 48KiB (`0xC000` bytes) to 128KiB (`0x20000` 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 64KiB, 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

Copyright and related rights waived via [CC0](../LICENSE.md).