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This guide provides instructions for migrating to a new version of ibc-go. Note: ibc-go supports golang semantic versioning and therefore all imports must be updated on major version releases. Diff examples are shown after the list of overall changes:
  • Chains will need to remove the ParamSubspace arg from all calls to Keeper constructors
  • MsgSubmitMisbehaviour has been removed. Use MsgUpdateClient with a ClientMessage that implements Misbehaviour instead (deprecated since v7)
  • (08-wasm) The deprecated Checksums type has been removed. Remove any direct usage of ibcwasmtypes.Checksums from your code
  app.IBCKeeper = ibckeeper.NewKeeper(
    appCodec,
    runtime.NewKVStoreService(keys[ibcexported.StoreKey]),
-   app.GetSubspace(ibcexported.ModuleName),
    app.UpgradeKeeper,
    authtypes.NewModuleAddress(govtypes.ModuleName).String(),
  )
The transfer module, the packet forward middleware, and the rate limiting middleware support custom address codecs. This feature is primarily added to support Cosmos EVM for IBC transfers. In a standard Cosmos SDK app, they are wired as follows: 
  app.TransferKeeper = ibctransferkeeper.NewKeeper(
    appCodec,
+    app.AccountKeeper.AddressCodec(),
    runtime.NewKVStoreService(keys[ibctransfertypes.StoreKey]),
    app.IBCKeeper.ChannelKeeper,
    app.MsgServiceRouter(),
    app.AccountKeeper, app.BankKeeper,
    authtypes.NewModuleAddress(govtypes.ModuleName).String(),
  )

  app.RateLimitKeeper = ratelimitkeeper.NewKeeper(
    appCodec,
+    app.AccountKeeper.AddressCodec(),
    runtime.NewKVStoreService(keys[ratelimittypes.StoreKey]),
    app.IBCKeeper.ChannelKeeper,
    app.IBCKeeper.ClientKeeper,
    app.BankKeeper,
    authtypes.NewModuleAddress(govtypes.ModuleName).String()
  )

  app.PFMKeeper = packetforwardkeeper.NewKeeper(
    appCodec,
+    app.AccountKeeper.AddressCodec(),
    runtime.NewKVStoreService(keys[packetforwardtypes.StoreKey]),
    app.TransferKeeper,
    app.IBCKeeper.ChannelKeeper,
    app.BankKeeper,
    authtypes.NewModuleAddress(govtypes.ModuleName).String()
  )