# MainNet and TestNet Update: Go-Algorand 4.2.1 **URL:** \ **Category:** Announcements\ **Tags:** testnet, mainnet\ **Created:** [August 5, 2025, 2:42pm UTC](https://forum.algorand.co/t/mainnet-and-testnet-update-go-algorand-4-2-1/14834 "2025-08-05T14:42:41Z")\ **Posts on this page:** 1\ **Page:** 1
**Author:** ![devops-service](https://sea2.discourse-cdn.com/flex016/user_avatar/forum.algorand.co/devops-service/32/2205_2.png) [@devops-service](https://forum.algorand.co/u/devops-service)\ **Post date:** [August 5, 2025, 2:42pm UTC](https://forum.algorand.co/t/mainnet-and-testnet-update-go-algorand-4-2-1/14834/1 "2025-08-05T14:42:41Z")
![GitHub Logo](https://us1.discourse-cdn.com/flex016/uploads/algorand/original/1X/fcd756bba61094f9e8774e43ec402e311aeea50e.jpeg) # Overview This release is in preparation for general P2P support roll out. In this initial phase, you can opt-in by setting `EnableP2PHybridMode: true` in your configuration . # What’s New - Several Reliability/Performance improvements to bring Hybrid P2P support to GA - Privacy protection when making P2P connections - Relay-relay network connection prioritization - Updates of CentOS/Darwin build targets - Logging that explicitly lays out what specific configurations are being ‘auto-migrated’ # Changelog ## New Features - Cicd: GitHub Actions workflows for nightly and PR tests ([#6346](https://github.com/algorand/go-algorand/pull/6346)) ## Enhancements - API: Avoid downstream generated type changes for pre-existing TransactionP… ([#6375](https://github.com/algorand/go-algorand/pull/6375)) - Build: Use latest oapi-codegen instead of fork. ([#6306](https://github.com/algorand/go-algorand/pull/6306)) - Build(deps): bump [GitHub - getkin/kin-openapi: OpenAPI 3.0 (and Swagger v2) implementation for Go (parsing, converting, validation, and more)](http://github.com/getkin/kin-openapi) from 0.107.0 to 0.131.0 ([#6326](https://github.com/algorand/go-algorand/pull/6326)) - Build(deps): bump [GitHub - pion/interceptor: Pluggable RTP/RTCP processors for building real time communication](http://github.com/pion/interceptor) from 0.1.37 to 0.1.39 ([#6362](https://github.com/algorand/go-algorand/pull/6362)) - Chore: Remove code that was need only during consensus update ([#6371](https://github.com/algorand/go-algorand/pull/6371)) - Chore: Move allocbounds ([#6324](https://github.com/algorand/go-algorand/pull/6324)) - Ci: add test result uploads and refactor nightly config ([#6372](https://github.com/algorand/go-algorand/pull/6372)) - Cicd: switch nightly uploads to GitHub Actions ([#6360](https://github.com/algorand/go-algorand/pull/6360)) - Config: reorg to allow use of basics ([#6325](https://github.com/algorand/go-algorand/pull/6325)) - Crypto: add SHA-512 hashes ([#6339](https://github.com/algorand/go-algorand/pull/6339)) - Dev: add auto-generated CLAUDE.md file ([#6379](https://github.com/algorand/go-algorand/pull/6379)) - Libgoal: bump defaultKMDTimeoutSecs ([#6353](https://github.com/algorand/go-algorand/pull/6353)) - Logging: log configuration migration messages ([#6384](https://github.com/algorand/go-algorand/pull/6384)) - Network: disable pubsub PX for hybrid relays ([#6385](https://github.com/algorand/go-algorand/pull/6385)) - Network: refactor networking mesh maintaining code ([#6374](https://github.com/algorand/go-algorand/pull/6374)) - Network: do not use telemetry id for p2p nets ([#6381](https://github.com/algorand/go-algorand/pull/6381)) - Network: add “uncompressed bytes by tag” metric ([#6334](https://github.com/algorand/go-algorand/pull/6334)) - Network: enable vote compression for P2PNetwork ([#6331](https://github.com/algorand/go-algorand/pull/6331)) - Node: fallback to ws or p2p on hybrid misconfiguration ([#6376](https://github.com/algorand/go-algorand/pull/6376)) - Node Exporter: update binaries with new golang build and add arm64 support ([#6387](https://github.com/algorand/go-algorand/pull/6387)) - Ops: Bump ubuntu and centos versions for building and testing ([#6378](https://github.com/algorand/go-algorand/pull/6378)) - Refactor: use maps.Copy for cleaner map handling ([#6373](https://github.com/algorand/go-algorand/pull/6373)) - Refactor: use slices.Contains to simplify code ([#6357](https://github.com/algorand/go-algorand/pull/6357)) - Refactor: use the built-in max/min to simplify the code ([#6338](https://github.com/algorand/go-algorand/pull/6338)) - Syntax: Use “type X” syntax instead of “type ( … )” ([#6364](https://github.com/algorand/go-algorand/pull/6364)) - Tests: test vFuture, so we are exercising branch512 ([#6365](https://github.com/algorand/go-algorand/pull/6365)) ## Bugfixes - API: Revert boxes pagination ([#6343](https://github.com/algorand/go-algorand/pull/6343)) - API: Update ‘value’ in API Box type to be optional (reflecting updated get… ([#6333](https://github.com/algorand/go-algorand/pull/6333)) - Agreement: fix mainLoop vs Shutdown race ([#6349](https://github.com/algorand/go-algorand/pull/6349)) - Ci: run PR tests on release PRs ([#6390](https://github.com/algorand/go-algorand/pull/6390)) - Cicd: fix short test flag and up parallelism ([#6370](https://github.com/algorand/go-algorand/pull/6370)) - Cicd: fix upload and make e2e\_subs\_nightly required ([#6369](https://github.com/algorand/go-algorand/pull/6369)) - Cicd: add missing AWS credential configuration to e2e\_subs ([#6368](https://github.com/algorand/go-algorand/pull/6368)) - Cicd: fix uploading testdata in nightlies ([#6367](https://github.com/algorand/go-algorand/pull/6367)) - Cicd: fix upload and slack failure For GitHub Actions and update badges ([#6366](https://github.com/algorand/go-algorand/pull/6366)) - Config: update diagcfg to properly set globalDir ([#6394](https://github.com/algorand/go-algorand/pull/6394)) - Dev: fix darwin universal targets ([#6383](https://github.com/algorand/go-algorand/pull/6383)) - Network: count received traffic before decompression ([#6330](https://github.com/algorand/go-algorand/pull/6330)) - P2p: ignore initial no peers error in capabilities advertisement ([#6310](https://github.com/algorand/go-algorand/pull/6310)) - Tests: fix flaky TestLedgerBlockHeaders UpgradeState check ([#6382](https://github.com/algorand/go-algorand/pull/6382)) - Tests: waitFor was badly broken ([#6359](https://github.com/algorand/go-algorand/pull/6359)) - Tests: be _under_ 1A, not equal ([#6335](https://github.com/algorand/go-algorand/pull/6335)) ## Protocol Upgrade This release does not contain a protocol upgrade. ## Additional Resources - [Algorand Forum](https://forum.algorand.co) - [Developer Portal](https://dev.algorand.co)