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  1. 44b9a30 cmd: fix go.mod files by Joe Tsai · 2 days ago master
  2. 60b368f runtime/protolegacy: remove package by Joe Tsai · 3 days ago
  3. 58b42d8 cmd/protoc-gen-go, runtime/protoimpl: enforce minimum and maximum versions by Joe Tsai · 3 days ago
  4. 6650091 runtime/protoiface: update package documentation by Joe Tsai · 3 days ago
  5. 21ade49 internal/impl: move legacy files into impl by Joe Tsai · 3 days ago

Next Generation Go Protocol Buffers

WARNING: This repository is in active development. There are no guarantees about API stability. Breaking changes will occur until a stable release is made and announced.

This repository is for the development of the next major Go implementation of protocol buffers. This library makes breaking API changes relative to the existing Go protobuf library. Of particular note, this API aims to make protobuf reflection a first-class feature of the API and implements the protobuf ecosystem in terms of reflection.

Design Documents

List of relevant design documents:


We appreciate community contributions. See

Reporting Issues

Issues regarding the new API can be filed at Please use a APIv2: prefix in the title to make it clear that the issue is regarding the new API work.