Cosmos Hub v29 Upgrade Goes Live October 28, Drops Legacy Params Module
Gaia v29 has run on the Hub's testnet since October 13, and validators switch to the new binary at block 33,618,500.
Key Takeaways
- The Cosmos Hub activates the Gaia v29 upgrade at block 33,618,500 on October 28, 2026.
- Governance proposal 1059 passed on October 27 with about 99.4% of the vote in favor.
- Gaia v29 removes the legacy x/params module and moves the Hub to Cosmos SDK v0.53.8 and Go 1.26.
- Korean exchanges Upbit and Coinone are pausing ATOM deposits and withdrawals during the upgrade.
The Cosmos Hub, the network behind Cosmos (ATOM), will activate its Gaia v29 upgrade at block 33,618,500 on October 28, 2026, after governance proposal 1059 passed on October 27 with about 99.4% of the vote in favor. The upgrade removes the legacy x/params module and moves the Hub to Cosmos SDK v0.53.8 and Go 1.26.
What the Gaia v29 Upgrade Changes
The v29 release is a state-breaking core upgrade, according to the Gaia v29.0.1 release notes in the Cosmos Hub's official repository. It removes the legacy x/params module together with the old ParameterChangeProposal route, and rebuilds the chain on Cosmos SDK v0.53.8 and Go 1.26. The follow-up v29.0.1 patch rebuilds Gaia with Go 1.26.10, which includes a fix for a crypto/x509 vulnerability. Node operators can run either binary for the scheduled height. The change keeps the Hub in step with the current Cosmos SDK generation used across the Cosmos ecosystem.
When Does the Cosmos Hub v29 Upgrade Go Live?
Proposal 1059 closed on October 27, 2026 at 12:01 UTC and passed with about 99.4% of the vote in favor, according to the Hub's on-chain governance record. The upgrade triggers at block 33,618,500, expected on October 28. The same code has been running on the Hub's testnet since October 13. Validators and node operators switch to the new Gaia binary at the upgrade height. The Hub is one of the layer 1 blockchains that route core changes through on-chain governance votes.
What ATOM Holders and Exchanges Are Doing
The upgrade does not involve a token swap. Traders can follow the Cosmos price chart through the switch. Korean exchanges Upbit and Coinone have told users they will pause ATOM deposits and withdrawals during the upgrade window, with Coinone's notice starting October 28 at 18:00 KST.
Frequently Asked Questions
When Is the Cosmos Hub v29 Upgrade?
Gaia v29 activates at block 33,618,500, expected on October 28, 2026. Governance approved the upgrade on October 27.
What Does the Cosmos Hub v29 Upgrade Change?
It removes the legacy x/params module and the old ParameterChangeProposal route, and moves the Hub to Cosmos SDK v0.53.8 and Go 1.26.
Do ATOM Holders Need to Do Anything for the v29 Upgrade?
No. The upgrade does not involve a token swap. Validators and node operators switch to the new Gaia binary at the upgrade height.
Did Cosmos Hub Proposal 1059 Pass?
Yes. Proposal 1059 closed on October 27, 2026 at 12:01 UTC with about 99.4% of the vote in favor.
Sources
- Gaia v29.0.1 Release Notes · cosmos/gaia GitHub
- Cosmos Hub v29 upgrade instructions · Cosmos Hub on X
- Cosmos (ATOM) deposit and withdrawal suspension notice · Coinone
Prices and market data: Coinranking.
