> ## Documentation Index
> Fetch the complete documentation index at: https://docs.cosmos.network/llms.txt
> Use this file to discover all available pages before exploring further.

# Changelog

> Release history and changelog for Cosmos IBC

<Info>
  This page tracks all releases and changes from the [cosmos/ibc-go](https://github.com/cosmos/ibc-go) repository.
  For the latest development updates, see the [UNRELEASED](https://github.com/cosmos/ibc-go/blob/main/CHANGELOG.md#unreleased) section.
</Info>

<Update label="2024-08-30" description="v8.5.0" tags={["IBC", "Release"]}>
  ## Dependencies

  * [#6828](https://github.com/cosmos/ibc-go/pull/6828) Bump Cosmos SDK to v0.50.9.
  * [#7222](https://github.com/cosmos/ibc-go/pull/7221) Update ics23 to v0.11.0.

  ## State Machine Breaking

  * (core/03-connection) [#7129](https://github.com/cosmos/ibc-go/pull/7129) Remove verification of self client and consensus state from connection handshake.
</Update>

<Update label="2024-07-29" description="v8.4.0" tags={["IBC", "Release"]}>
  ## Improvements

  * (core/04-channel) [#6871](https://github.com/cosmos/ibc-go/pull/6871) Add channel ordering to write acknowledgement event.

  ## Features

  * (apps/transfer) [#6877](https://github.com/cosmos/ibc-go/pull/6877) Added the possibility to transfer the entire user balance of a particular denomination by using [`UnboundedSpendLimit`](https://github.com/cosmos/ibc-go/blob/beb2d93b58835ddb9ed8e7624988f1e66b849251/modules/apps/transfer/types/token.go#L56-L58) as the token amount.

  ## Bug Fixes

  * (core/04-channel) [#6935](https://github.com/cosmos/ibc-go/pull/6935) Check upgrade compatibility in `ChanUpgradeConfirm`.
</Update>

<Update label="2024-06-20" description="v8.3.2" tags={["IBC", "Release"]}>
  ## Dependencies

  * [#6614](https://github.com/cosmos/ibc-go/pull/6614) Bump Cosmos SDK to v0.50.7.

  ## Improvements

  * (apps/27-interchain-accounts) [#6436](https://github.com/cosmos/ibc-go/pull/6436) Refactor ICA host keeper instantiation method to avoid panic related to proto files.
</Update>

<Update label="2024-05-22" description="v8.3.1" tags={["IBC", "Release"]}>
  ## Improvements

  * (core/ante) [#6302](https://github.com/cosmos/ibc-go/pull/6302) Performance: Skip app callbacks during RecvPacket execution in checkTx within the redundant relay ante handler.
  * (core/ante) [#6280](https://github.com/cosmos/ibc-go/pull/6280) Performance: Skip redundant proof checking in RecvPacket execution in reCheckTx within the redundant relay ante handler.
  * (core/ante) [#6306](https://github.com/cosmos/ibc-go/pull/6306) Performance: Skip misbehaviour checks in UpdateClient flow and skip signature checks in reCheckTx mode.
</Update>

<Update label="2024-05-16" description="v8.3.0" tags={["IBC", "Release"]}>
  ## Dependencies

  * [#6300](https://github.com/cosmos/ibc-go/pull/6300) Bump Cosmos SDK to v0.50.6 and CometBFT to v0.38.7.

  ## State Machine Breaking

  * (light-clients/07-tendermint) [#6276](https://github.com/cosmos/ibc-go/pull/6276) Fix: No-op to avoid panicking on `UpdateState` for invalid misbehaviour submissions.

  ## Improvements

  * (apps/27-interchain-accounts, apps/transfer, apps/29-fee) [#6253](https://github.com/cosmos/ibc-go/pull/6253) Allow channel handshake to succeed if fee middleware is wired up on one side, but not the other.
  * (apps/27-interchain-accounts) [#6251](https://github.com/cosmos/ibc-go/pull/6251) Use `UNORDERED` as the default ordering for new ICA channels.
  * (apps/transfer) [#6268](https://github.com/cosmos/ibc-go/pull/6268) Use memo strings instead of JSON keys in `AllowedPacketData` of transfer authorization.
  * (core/ante) [#6278](https://github.com/cosmos/ibc-go/pull/6278) Performance: Exclude pruning from tendermint client updates in ante handler executions.
  * (core/ante) [#6302](https://github.com/cosmos/ibc-go/pull/6302) Performance: Skip app callbacks during RecvPacket execution in checkTx within the redundant relay ante handler.
  * (core/ante) [#6280](https://github.com/cosmos/ibc-go/pull/6280) Performance: Skip redundant proof checking in RecvPacket execution in reCheckTx within the redundant relay ante handler.

  ## Features

  * (core) [#6055](https://github.com/cosmos/ibc-go/pull/6055) Introduce a new interface `ConsensusHost` used to validate an IBC `ClientState` and `ConsensusState` against the host chain's underlying consensus parameters.
  * (core/02-client) [#5821](https://github.com/cosmos/ibc-go/pull/5821) Add rpc `VerifyMembershipProof` (querier approach for conditional clients).
  * (core/04-channel) [#5788](https://github.com/cosmos/ibc-go/pull/5788) Add `NewErrorAcknowledgementWithCodespace` to allow codespaces in ack errors.
  * (apps/27-interchain-accounts) [#5785](https://github.com/cosmos/ibc-go/pull/5785) Introduce a new tx message that ICA host submodule can use to query the chain (only those marked with `module_query_safe`) and write the responses to the acknowledgement.

  ## Bug Fixes

  * (apps/27-interchain-accounts) [#6167](https://github.com/cosmos/ibc-go/pull/6167) Fixed an edge case bug where migrating params for a pre-existing ica module which implemented controller functionality only could panic when migrating params for newly added host, and align controller param migration with host.
  * (app/29-fee) [#6255](https://github.com/cosmos/ibc-go/pull/6255) Delete refunded fees from state if some fee(s) cannot be refunded on channel closure.
</Update>

<Update label="2024-04-05" description="v8.2.0" tags={["IBC", "Release"]}>
  ## Dependencies

  * [#5975](https://github.com/cosmos/ibc-go/pull/5975) Bump Cosmos SDK to v0.50.5.

  ## Improvements

  * (proto) [#5987](https://github.com/cosmos/ibc-go/pull/5987) Add wasm proto files.
</Update>

<Update label="2024-01-31" description="v8.1.0" tags={["IBC", "Release"]}>
  ## Dependencies

  * [#5663](https://github.com/cosmos/ibc-go/pull/5663) Bump Cosmos SDK to v0.50.3 and CometBFT to v0.38.2.

  ## State Machine Breaking

  * (apps/27-interchain-accounts) [#5442](https://github.com/cosmos/ibc-go/pull/5442) Increase the maximum allowed length for the memo field of `InterchainAccountPacketData`.

  ## Improvements

  * (core/02-client) [#5429](https://github.com/cosmos/ibc-go/pull/5429) Add wildcard `"*"` to allow all clients in `AllowedClients` param.
  * (core) [#5541](https://github.com/cosmos/ibc-go/pull/5541) Enable emission of events on erroneous IBC application callbacks by appending a prefix to all event type and attribute keys.

  ## Features

  * (core/04-channel) [#1613](https://github.com/cosmos/ibc-go/pull/1613) Channel upgradability.
  * (apps/transfer) [#5280](https://github.com/cosmos/ibc-go/pull/5280) Add list of allowed packet data keys to `Allocation` of `TransferAuthorization`.
  * (apps/27-interchain-accounts) [#5633](https://github.com/cosmos/ibc-go/pull/5633) Allow setting new and upgrading existing ICA (ordered) channels to use unordered ordering.

  ## Bug Fixes

  * (apps/27-interchain-accounts) [#5343](https://github.com/cosmos/ibc-go/pull/5343) Add check if controller is enabled in `sendTx` before sending packet to host.
  * (apps/29-fee) [#5441](https://github.com/cosmos/ibc-go/pull/5441) Allow setting the relayer address as payee.
</Update>

<Update label="2024-01-31" description="v8.0.1" tags={["IBC", "Release"]}>
  ## Dependencies

  * [#5718](https://github.com/cosmos/ibc-go/pull/5718) Update Cosmos SDK to v0.50.3 and CometBFT to v0.38.2.

  ## Improvements

  * (core) [#5541](https://github.com/cosmos/ibc-go/pull/5541) Enable emission of events on erroneous IBC application callbacks by appending a prefix to all event type and attribute keys.
</Update>

<Update label="2023-11-10" description="v8.0.0" tags={["IBC", "Release"]}>
  ## Dependencies

  * [#5038](https://github.com/cosmos/ibc-go/pull/5038) Bump SDK v0.50.1 and cometBFT v0.38.
  * [#4398](https://github.com/cosmos/ibc-go/pull/4398) Update all modules to go 1.21.

  ## API Breaking

  * (core) [#4703](https://github.com/cosmos/ibc-go/pull/4703) Make `PortKeeper` field of `IBCKeeper` a pointer.
  * (core/23-commitment) [#4459](https://github.com/cosmos/ibc-go/pull/4459) Remove `Pretty` and `String` custom implementations of `MerklePath`.
  * [#3205](https://github.com/cosmos/ibc-go/pull/3205) Make event emission functions unexported.
  * (apps/27-interchain-accounts, apps/transfer) [#3253](https://github.com/cosmos/ibc-go/pull/3253) Rename `IsBound` to `HasCapability`.
  * (apps/27-interchain-accounts, apps/transfer) [#3303](https://github.com/cosmos/ibc-go/pull/3303) Make `HasCapability` private.
  * [#3303](https://github.com/cosmos/ibc-go/pull/3856) Add missing/remove unnecessary gogoproto directive.
  * (apps/27-interchain-accounts) [#3967](https://github.com/cosmos/ibc-go/pull/3967) Add encoding type as argument to ICA encoding/decoding functions.
  * (core) [#3867](https://github.com/cosmos/ibc-go/pull/3867) Remove unnecessary event attribute from INIT handshake msgs.
  * (core/04-channel) [#3806](https://github.com/cosmos/ibc-go/pull/3806) Remove unused `EventTypeTimeoutPacketOnClose`.
  * (testing) [#4018](https://github.com/cosmos/ibc-go/pull/4018) Allow failure expectations when using `chain.SendMsgs`.

  ## State Machine Breaking

  * (apps/transfer, apps/27-interchain-accounts, app/29-fee) [#4992](https://github.com/cosmos/ibc-go/pull/4992) Set validation for length of string fields.

  ## Improvements

  * [#3304](https://github.com/cosmos/ibc-go/pull/3304) Remove unnecessary defer func statements.
  * (apps/29-fee) [#3054](https://github.com/cosmos/ibc-go/pull/3054) Add page result to ics29-fee queries.
  * (apps/27-interchain-accounts, apps/transfer) [#3077](https://github.com/cosmos/ibc-go/pull/3077) Add debug level logging for the error message which is discarded when generating a failed acknowledgement.
  * (core/03-connection) [#3244](https://github.com/cosmos/ibc-go/pull/3244) Cleanup 03-connection msg validate basic test.
  * (core/02-client) [#3514](https://github.com/cosmos/ibc-go/pull/3514) Add check for the client status in `CreateClient`.
  * (apps/29-fee) [#4100](https://github.com/cosmos/ibc-go/pull/4100) Adding `MetadataFromVersion` to `29-fee` package `types`.
  * (apps/29-fee) [#4290](https://github.com/cosmos/ibc-go/pull/4290) Use `types.MetadataFromVersion` helper function for callback handlers.
  * (core/04-channel) [#4155](https://github.com/cosmos/ibc-go/pull/4155) Adding `IsOpen` and `IsClosed` methods to `Channel` type.
  * (core/03-connection) [#4110](https://github.com/cosmos/ibc-go/pull/4110) Remove `Version` interface and casting functions from 03-connection.
  * (core) [#4835](https://github.com/cosmos/ibc-go/pull/4835) Use expected interface for legacy params subspace parameter of keeper constructor functions.

  ## Features

  * (capability) [#3097](https://github.com/cosmos/ibc-go/pull/3097) Migrate capability module from Cosmos SDK to ibc-go.
  * (core/02-client) [#3640](https://github.com/cosmos/ibc-go/pull/3640) Migrate client params to be self managed.
  * (core/03-connection) [#3650](https://github.com/cosmos/ibc-go/pull/3650) Migrate connection params to be self managed.
  * (apps/transfer) [#3553](https://github.com/cosmos/ibc-go/pull/3553) Migrate transfer parameters to be self managed (#3553)
  * (apps/27-interchain-accounts) [#3520](https://github.com/cosmos/ibc-go/pull/3590) Migrate ica/controller parameters to be self managed (#3590)
  * (apps/27-interchain-accounts) [#3520](https://github.com/cosmos/ibc-go/pull/3520) Migrate ica/host to params to be self managed.
  * (apps/transfer) [#3104](https://github.com/cosmos/ibc-go/pull/3104) Add metadata for IBC tokens.
  * [#4620](https://github.com/cosmos/ibc-go/pull/4620) Migrate to gov v1 via the additions of `MsgRecoverClient` and `MsgIBCSoftwareUpgrade`. The legacy proposal types `ClientUpdateProposal` and `UpgradeProposal` have been deprecated and will be removed in the next major release.

  ## Bug Fixes

  * (apps/transfer) [#4709](https://github.com/cosmos/ibc-go/pull/4709) Order query service RPCs to fix availability of denom traces endpoint when no args are provided.
  * (core/04-channel) [#3357](https://github.com/cosmos/ibc-go/pull/3357) Handle unordered channels in `NextSequenceReceive` query.
  * (e2e) [#3402](https://github.com/cosmos/ibc-go/pull/3402) Allow retries for messages signed by relayer.
  * (core/04-channel) [#3417](https://github.com/cosmos/ibc-go/pull/3417) Add missing query for next sequence send.
  * (testing) [#4630](https://github.com/cosmos/ibc-go/pull/4630) Update `testconfig` to use revision formatted chain IDs.
  * (core/04-channel) [#4706](https://github.com/cosmos/ibc-go/pull/4706) Retrieve correct next send sequence for packets in unordered channels.
  * (core/02-client) [#4746](https://github.com/cosmos/ibc-go/pull/4746) Register implementations against `govtypes.Content` interface.
  * (apps/27-interchain-accounts) [#4944](https://github.com/cosmos/ibc-go/pull/4944) Add missing proto interface registration.
  * (core/02-client) [#5020](https://github.com/cosmos/ibc-go/pull/5020) Fix expect pointer error when unmarshalling misbehaviour file.

  ## Documentation

  * [#3133](https://github.com/cosmos/ibc-go/pull/3133) Add linter for markdown documents.
  * [#4693](https://github.com/cosmos/ibc-go/pull/4693) Migrate docs to docusaurus.

  ## Testing

  * [#3138](https://github.com/cosmos/ibc-go/pull/3138) Use `testing.TB` instead of `testing.T` to support benchmarks and fuzz tests.
  * [#3980](https://github.com/cosmos/ibc-go/pull/3980) Change `sdk.Events` usage to `[]abci.Event` in the testing package.
  * [#3986](https://github.com/cosmos/ibc-go/pull/3986) Add function `RelayPacketWithResults`.
  * [#4182](https://github.com/cosmos/ibc-go/pull/4182) Return current validator set when requesting current height in `GetValsAtHeight`.
  * [#4319](https://github.com/cosmos/ibc-go/pull/4319) Fix in `TimeoutPacket` function to use counterparty `portID`/`channelID` in `GetNextSequenceRecv` query.
  * [#4180](https://github.com/cosmos/ibc-go/pull/4180) Remove unused function `simapp.SetupWithGenesisAccounts`.

  ## Miscellaneous Tasks

  * (apps/27-interchain-accounts) [#4677](https://github.com/cosmos/ibc-go/pull/4677) Remove ica store key.
  * [#4724](https://github.com/cosmos/ibc-go/pull/4724) Add `HasValidateBasic` compiler assertions to messages.
  * [#4725](https://github.com/cosmos/ibc-go/pull/4725) Add fzf selection for config files.
  * [#4741](https://github.com/cosmos/ibc-go/pull/4741) Panic with error.
  * [#3186](https://github.com/cosmos/ibc-go/pull/3186) Migrate all SDK errors to the new errors go module.
  * [#3216](https://github.com/cosmos/ibc-go/pull/3216) Modify `simapp` to fulfill the SDK `runtime.AppI` interface.
  * [#3290](https://github.com/cosmos/ibc-go/pull/3290) Remove `gogoproto` yaml tags from proto files.
  * [#3439](https://github.com/cosmos/ibc-go/pull/3439) Use nil pointer pattern to check for interface compliance.
  * [#3433](https://github.com/cosmos/ibc-go/pull/3433) Add tests for `acknowledgement.Acknowledgement()`.
  * (core, apps/29-fee) [#3462](https://github.com/cosmos/ibc-go/pull/3462) Add missing `nil` check and corresponding tests for query handlers.
  * (light-clients/07-tendermint, light-clients/06-solomachine) [#3571](https://github.com/cosmos/ibc-go/pull/3571) Delete unused `GetProofSpecs` functions.
  * (core) [#3616](https://github.com/cosmos/ibc-go/pull/3616) Add debug log for redundant relay.
  * (core) [#3892](https://github.com/cosmos/ibc-go/pull/3892) Add deprecated option to `create_localhost` field.
  * (core) [#3893](https://github.com/cosmos/ibc-go/pull/3893) Add deprecated option to `MsgSubmitMisbehaviour`.
  * (apps/transfer, apps/29-fee) [#4570](https://github.com/cosmos/ibc-go/pull/4570) Remove `GetSignBytes` from 29-fee and transfer msgs.
  * [#3630](https://github.com/cosmos/ibc-go/pull/3630) Add annotation to Msg service.
</Update>