MIP-6

MONAD_NINE Network Upgrade

Final Meta Hardfork ⏶ MONAD_NINE hardfork GitHub ↗ Forum ↗

Idea Draft Review Last Call Final Living

Meta MIP for the `MONAD_NINE` network upgrade

Authors: Category Labs
Created: 2026-01-22
Updated: Jun 15, 2026
Forum: 1p · 1♥

Stakeholder Impact

What this MIP changes for each audience. Severity and action flags are model-derived with deterministic floors per MIP type/category.

TL;DR

The MONAD_NINE network upgrade introduces several enhancements to the Monad network, aimed at improving functionality and performance.

What's Changing

MIP-3: Linear Memory - This change allows for more efficient memory usage in smart contracts.
MIP-4: Reserve Balance Introspection - This feature enables better tracking and management of reserve balances.
MIP-5: Fusaka EIP Activation - This activation integrates a new Ethereum Improvement Proposal to enhance network capabilities.
Activation Dates - The Testnet will activate on March 10, 2026, and the Mainnet on March 19, 2026.

⌘

Developers

Smart contract & dapp builders, RPC consumers, tooling authors

The upgrade introduces changes in the ABI and potentially new opcodes related to linear memory and reserve balance introspection, which may require developers to update their contracts. Additionally, existing contracts may need to be recompiled or redeployed to ensure compatibility with the new features.

High action required

◉

Users

Wallet users, EOA holders, dapp visitors

The MONAD_NINE network upgrade may introduce changes that could affect transaction fees and confirmation speeds, but specific details are not provided. Users should monitor for any updates regarding wallet compatibility and potential actions needed post-upgrade.

Medium

◆

Validators

Node operators, RPC operators, delegators

The MONAD_NINE network upgrade is a mandatory client upgrade that will require validators to update their software to remain operational. This upgrade may also influence validator revenue depending on the specifics of the included MIPs, particularly regarding fee structures and reward distributions.

High action required

✦

Foundation

Monad Foundation & Category Labs core devs

The MONAD_NINE network upgrade requires coordination for hardfork activation across multiple clients and partners, as well as communication to the ecosystem regarding the changes and timelines. This sets a precedent for future upgrades and their governance processes.

High action required

Generated May 29, 2026, 8:51 AM · model: gpt-4o-mini

Specification

Subsystems consensus evm


## Abstract

This Meta MIP specifies the changes included in the `MONAD_NINE` revision of the
Monad network.

## Specification

### Included MIPs

- [MIP-3: Linear Memory](./MIP-3.md)
- [MIP-4: Reserve Balance Introspection](./MIP-4.md)
- [MIP-5: Fusaka EIP Activation](./MIP-5.md)

### Activation

| Network | Activation Timestamp |
|---------|---------------------|
| Monad Testnet | `1773153000` (Mar 10, 2026, 14:30 UTC) |
| Monad Mainnet | `1773930600` (Mar 19, 2026, 14:30 UTC) |

## Rationale

This upgrade includes:

- [MIP-3: Linear Memory](./MIP-3.md)
- [MIP-4: Reserve Balance Introspection](./MIP-4.md)
- [MIP-5: Fusaka EIP Activation](./MIP-5.md)

## Copyright

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

Forum discussion

1 posts · 1 likes · 5 months ago