> ## 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="2023-10-20" description="v5.3.2" tags={["IBC", "Release"]}>
  ## Bug Fixes

  * (apps/transfer) [#3045](https://github.com/cosmos/ibc-go/pull/3045) allow value with slashes in URL template for `denom_traces` and `denom_hashes` queries.
  * (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.
</Update>

<Update label="2023-05-25" description="v5.3.1" tags={["IBC", "Release"]}>
  ## Bug Fixes

  * [#3346](https://github.com/cosmos/ibc-go/pull/3346) Properly handle ordered channels in `UnreceivedPackets` query.
</Update>

<Update label="2023-05-04" description="v5.3.0" tags={["IBC", "Release"]}>
  ## Dependencies

  * [#3354](https://github.com/cosmos/ibc-go/pull/3354) Bump Cosmos SDK to v0.46.12 and replace Tendermint with CometBFT v0.34.27.
</Update>

<Update label="2023-05-25" description="v5.2.1" tags={["IBC", "Release"]}>
  ## Bug Fixes

  * [#3346](https://github.com/cosmos/ibc-go/pull/3346) Properly handle ordered channels in `UnreceivedPackets` query.
</Update>

<Update label="2022-12-20" description="v5.2.0" tags={["IBC", "Release"]}>
  ## Dependencies

  * [#2868](https://github.com/cosmos/ibc-go/pull/2868) Bump ICS 23 to v0.9.0.
  * [#2944](https://github.com/cosmos/ibc-go/pull/2944) Bump Cosmos SDK to v0.46.7 and Tendermint to v0.34.24.

  ## State Machine Breaking

  * (apps/29-fee) [#2942](https://github.com/cosmos/ibc-go/pull/2942) Check `x/bank` send enabled before escrowing fees.

  ## Improvements

  * (apps/29-fee) [#2786](https://github.com/cosmos/ibc-go/pull/2786) Save gas by checking key existence with `KVStore`'s `Has` method.
</Update>

<Update label="2022-11-09" description="v5.1.0" tags={["IBC", "Release"]}>
  ## Dependencies

  * [#2647](https://github.com/cosmos/ibc-go/pull/2647) Bump Cosmos SDK to v0.46.4 and Tendermint to v0.34.22.

  ## State Machine Breaking

  * (apps/transfer) [#2651](https://github.com/cosmos/ibc-go/pull/2651) Introduce `mustProtoMarshalJSON` for ics20 packet data marshalling which will skip emission (marshalling) of the memo field if unpopulated (empty).
  * (27-interchain-accounts) [#2590](https://github.com/cosmos/ibc-go/pull/2590) Removing port prefix requirement from the ICA host channel handshake
  * (transfer) [#2377](https://github.com/cosmos/ibc-go/pull/2377) Adding `sequence` to `MsgTransferResponse`.

  ## Improvements

  * (testing) [#2657](https://github.com/cosmos/ibc-go/pull/2657) Carry `ProposerAddress` through committed blocks. Allow `DefaultGenTxGas` to be modified.

  ## Features

  * (apps/transfer) [#2595](https://github.com/cosmos/ibc-go/pull/2595) Adding optional memo field to `FungibleTokenPacketData` and `MsgTransfer`.

  ## Bug Fixes

  * (apps/transfer) [#2679](https://github.com/cosmos/ibc-go/pull/2679) Check `x/bank` send enabled.
</Update>

<Update label="2022-10-27" description="v5.0.1" tags={["IBC", "Release"]}>
  ## Dependencies

  * [#2623](https://github.com/cosmos/ibc-go/pull/2623) Bump SDK version to v0.46.3 and Tendermint version to v0.34.22.
</Update>

<Update label="2022-09-28" description="v5.0.0" tags={["IBC", "Release"]}>
  ## Dependencies

  * [#1653](https://github.com/cosmos/ibc-go/pull/1653) Bump SDK version to v0.46
  * [#2124](https://github.com/cosmos/ibc-go/pull/2124) Bump SDK version to v0.46.1

  ## API Breaking

  * (testing)[#2028](https://github.com/cosmos/ibc-go/pull/2028) New interface `ibctestingtypes.StakingKeeper` added and set for the testing app `StakingKeeper` setup.
  * (core/04-channel) [#1418](https://github.com/cosmos/ibc-go/pull/1418) `NewPacketId` has been renamed to `NewPacketID` to comply with go linting rules.
  * (core/ante) [#1418](https://github.com/cosmos/ibc-go/pull/1418) `AnteDecorator` has been renamed to `RedundancyDecorator` to comply with go linting rules and to give more clarity to the purpose of the Decorator.
  * (core/ante) [#1820](https://github.com/cosmos/ibc-go/pull/1418) `RedundancyDecorator` has been renamed to `RedundantRelayDecorator` to make the name for explicit.
  * (testing) [#1418](https://github.com/cosmos/ibc-go/pull/1418) `MockIBCApp` has been renamed to `IBCApp` and `MockEmptyAcknowledgement` has been renamed to `EmptyAcknowledgement` to comply with go linting rules
  * (apps/27-interchain-accounts) [#2058](https://github.com/cosmos/ibc-go/pull/2058) Added `MessageRouter` interface and replaced `*baseapp.MsgServiceRouter` with it. The controller and host keepers of apps/27-interchain-accounts have been updated to use it.
  * (apps/27-interchain-accounts)[#2302](https://github.com/cosmos/ibc-go/pull/2302) Handle unwrapping of channel version in interchain accounts channel reopening handshake flow. The `host` submodule `Keeper` now requires an `ICS4Wrapper` similarly to the `controller` submodule.

  ## Improvements

  * (27-interchain-accounts) [#1352](https://github.com/cosmos/ibc-go/pull/1352) Add support for Cosmos-SDK simulation to ics27 module.
  * (linting) [#1418](https://github.com/cosmos/ibc-go/pull/1418) Fix linting errors, resulting compatibility with go1.18 linting style, golangci-lint 1.46.2 and the revivie linter.  This caused breaking changes in core/04-channel, core/ante, and the testing library.

  ## Features

  * (apps/27-interchain-accounts) [#2193](https://github.com/cosmos/ibc-go/pull/2193) Adding `InterchainAccount` gRPC query endpoint to ICS27 `controller` submodule to allow users to retrieve registered interchain account addresses.

  ## Bug Fixes

  * (27-interchain-accounts) [#2308](https://github.com/cosmos/ibc-go/pull/2308) Nil checks have been added to ensure services are not registered for nil host or controller keepers.
  * (makefile) [#1785](https://github.com/cosmos/ibc-go/pull/1785) Fetch the correct versions of protocol buffers dependencies from tendermint, cosmos-sdk, and ics23.
  * (modules/core/04-channel)[#1919](https://github.com/cosmos/ibc-go/pull/1919) Fixed formatting of sequence for packet "acknowledgement written" logs.
</Update>