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Upgrading CometBFT

This guide provides instructions for upgrading to specific versions of CometBFT.

v0.37.1

For users explicitly making use of the Go APIs provided in the crypto/merkle package, please note that, in order to fix a potential security issue, we had to make a breaking change here. This change should only affect a small minority of users. For more details, please see #557.

v0.37.0

This release introduces state machine-breaking changes, and therefore requires a coordinated upgrade.

Go API

When upgrading from the v0.34 release series, please note that the Go module has now changed to github.com/cometbft/cometbft.

ABCI Changes

  • The ABCIVersion is now 1.0.0.
  • Added new ABCI methods PrepareProposal and ProcessProposal. For details, please see the spec. Applications upgrading to v0.37.0 must implement these methods, at the very minimum, as described here
  • Deduplicated ConsensusParams and BlockParams. In the v0.34 branch they are defined both in abci/types.proto and types/params.proto. The definitions in abci/types.proto have been removed. In-process applications should make sure they are not using the deleted version of those structures.
  • In v0.34, messages on the wire used to be length-delimited with int64 varint values, which was inconsistent with the uint64 varint length delimiters used in the P2P layer. Both now consistently use uint64 varint length delimiters.
  • Added AbciVersion to RequestInfo. Applications should check that CometBFT's ABCI version matches the one they expect in order to ensure compatibility.
  • The SetOption method has been removed from the ABCI Client interface. The corresponding Protobuf types have been deprecated.
  • The key and value fields in the EventAttribute type have been changed from type bytes to string. As per the Protocol Buffers updating guidelines, this should have no effect on the wire-level encoding for UTF8-encoded strings.

RPC

If you rely on the /tx_search or /block_search endpoints for event querying, please note that the default behaviour of these endpoints has changed in a way that might break your queries. The original behaviour was poorly specified, which did not respect event boundaries.

Please see tendermint/tendermint#9712 for context on the bug that was addressed that resulted in this behaviour change.

For historical upgrading instructions for Tendermint Core v0.34.24 and earlier, please see the Tendermint Core upgrading instructions.