# \[CONSTITUTIONAL\] AIP: ArbOS Version 40 Callisto

**URL:** https://forum.arbitrum.foundation/t/constitutional-aip-arbos-version-40-callisto/28436
**Category:** Finalized AIPs
**Created:** [February 13, 2025, 1:55pm UTC](https://forum.arbitrum.foundation/t/constitutional-aip-arbos-version-40-callisto/28436 "2025-02-13T13:55:57Z")
**Posts on this page:** 1
**Showing post:** 3

<div class="post-metadata">

### Author: ![web3citizenxyz](https://yyz1.discourse-cdn.com/flex029/user_avatar/forum.arbitrum.foundation/web3citizenxyz/32/10925_2.png) [@web3citizenxyz](https://forum.arbitrum.foundation/u/web3citizenxyz)
#### Post date: [February 13, 2025, 10:50pm UTC](https://forum.arbitrum.foundation/t/constitutional-aip-arbos-version-40-callisto/28436/3 "2025-02-13T22:50:48Z")

</div>

Glad to see the proposal to support Pectra! When is the snapshot estimated for? Also, could there be any issues in the future with not adopting 7623 and having different calldata costs?

---

_[View the full topic](https://forum.arbitrum.foundation/t/constitutional-aip-arbos-version-40-callisto/28436)._