# Upgrading Ethereum

Source: https://eth2book.info
Kiwi News: https://news.kiwistand.com/stories/Upgrading-Ethereum?index=0x68b745eb9c8e013da4f83dc6ec8dc6ca9d572a023acf2b825eac18ad166bf9f8d96498d3
Submitted by sileo.eth on 2025-09-02 UTC, 2 upvotes, 0 comments

## Summary

This is a work-in-progress technical handbook, also called "The Eth2 Book," on Ethereum's move to proof of stake and beyond. Its editions follow the names of Ethereum consensus layer upgrades: Edition 0.1 is Altair, Edition 0.2 is Bellatrix, and Edition 0.3 is Capella, which is the current work in progress. The latest version is always at eth2book.info/latest, and earlier editions are frozen as they were published. The source material is available on GitHub, and a PDF version is also offered.

## Article

A technical handbook on Ethereum’s move to proof of stake and beyond

Aka “The Eth2 Book”.

This is a work in progress. It is not a small project, and will take some time to complete. I appreciate your patience.

Editions

Editions follow the naming of Ethereum consensus layer upgrades:

Edition 0.3: Capella [current WIP]

Edition 0.2: Bellatrix

Edition 0.1: Altair

My original Phase 0 Annotated Specification remains available elsewhere for historical interest.

The latest version is always at https://eth2book.info/latest/. It currently points to the Capella edition. Earlier editions are now frozen as-is, but are of historical interest as the protocol continues to change.

A PDF version is available.

The source material and everything needed to build the site and the PDF is available on GitHub.

Coffee

Kind souls sometimes ask for a way to send me a cup of coffee or make a donation. My account info is below - donations are absolutely not expected or necessary, but are always very encouraging and gratefully received.

0xd262d146e869915444d0f34ecdaabab5ab43007e on Ethereum, ZkSync, Polygon, Optimism, Arbitrum.

Also at benjaminion.eth

Any whales or large treasuries out there, I encourage you to take a look at the Protocol Guild which supports the people developing and maintaining our incredible technology, not just writing about it.