diff --git a/app/upgrades.go b/app/upgrades.go
index 45c25d1804..f9dac8a4e2 100644
--- a/app/upgrades.go
+++ b/app/upgrades.go
@@ -2,116 +2,15 @@ package app
 
 import (
 	"context"
-	"fmt"
-	"time"
 
-	sdkmath "cosmossdk.io/math"
-	storetypes "cosmossdk.io/store/types"
 	upgradetypes "cosmossdk.io/x/upgrade/types"
 	"github.com/cosmos/cosmos-sdk/codec"
-	sdk "github.com/cosmos/cosmos-sdk/types"
 	"github.com/cosmos/cosmos-sdk/types/module"
-	govkeeper "github.com/cosmos/cosmos-sdk/x/gov/keeper"
-	govv1 "github.com/cosmos/cosmos-sdk/x/gov/types/v1"
-	icahosttypes "github.com/cosmos/ibc-go/v9/modules/apps/27-interchain-accounts/host/types"
-	evmtypes "github.com/evmos/ethermint/x/evm/types"
 )
 
 func (app *App) RegisterUpgradeHandlers(cdc codec.BinaryCodec) {
-	planName := "v1.4"
+	planName := "v1.5" // TBD
 	app.UpgradeKeeper.SetUpgradeHandler(planName, func(ctx context.Context, plan upgradetypes.Plan, fromVM module.VersionMap) (module.VersionMap, error) {
-		m, err := app.ModuleManager.RunMigrations(ctx, app.configurator, fromVM)
-		if err != nil {
-			return m, err
-		}
-
-		sdkCtx := sdk.UnwrapSDKContext(ctx)
-		{
-			params := app.ICAHostKeeper.GetParams(sdkCtx)
-			params.HostEnabled = false
-			app.ICAHostKeeper.SetParams(sdkCtx, params)
-			evmParams := app.EvmKeeper.GetParams(sdkCtx)
-			evmParams.HeaderHashNum = evmtypes.DefaultHeaderHashNum
-			if err := app.EvmKeeper.SetParams(sdkCtx, evmParams); err != nil {
-				return m, err
-			}
-			if err := UpdateExpeditedParams(ctx, app.GovKeeper); err != nil {
-				return m, err
-			}
-		}
-		return m, nil
-	})
-
-	// a hotfix upgrade plan just for testnet
-	hotfixPlanName := "v1.4.0-rc5-testnet"
-	app.UpgradeKeeper.SetUpgradeHandler(hotfixPlanName, func(ctx context.Context, plan upgradetypes.Plan, fromVM module.VersionMap) (module.VersionMap, error) {
 		return app.ModuleManager.RunMigrations(ctx, app.configurator, fromVM)
 	})
-
-	upgradeInfo, err := app.UpgradeKeeper.ReadUpgradeInfoFromDisk()
-	if err != nil {
-		panic(fmt.Sprintf("failed to read upgrade info from disk %s", err))
-	}
-	if !app.UpgradeKeeper.IsSkipHeight(upgradeInfo.Height) {
-		if upgradeInfo.Name == planName {
-			app.SetStoreLoader(upgradetypes.UpgradeStoreLoader(upgradeInfo.Height, &storetypes.StoreUpgrades{
-				Added: []string{
-					icahosttypes.StoreKey,
-				},
-				Deleted: []string{"icaauth"},
-			}))
-		}
-	}
-}
-
-func UpdateExpeditedParams(ctx context.Context, gov govkeeper.Keeper) error {
-	govParams, err := gov.Params.Get(ctx)
-	if err != nil {
-		return err
-	}
-	if len(govParams.MinDeposit) > 0 {
-		minDeposit := govParams.MinDeposit[0]
-		expeditedAmount := minDeposit.Amount.MulRaw(govv1.DefaultMinExpeditedDepositTokensRatio)
-		govParams.ExpeditedMinDeposit = sdk.NewCoins(sdk.NewCoin(minDeposit.Denom, expeditedAmount))
-	}
-	threshold, err := sdkmath.LegacyNewDecFromStr(govParams.Threshold)
-	if err != nil {
-		return fmt.Errorf("invalid threshold string: %w", err)
-	}
-	expeditedThreshold, err := sdkmath.LegacyNewDecFromStr(govParams.ExpeditedThreshold)
-	if err != nil {
-		return fmt.Errorf("invalid expedited threshold string: %w", err)
-	}
-	if expeditedThreshold.LTE(threshold) {
-		expeditedThreshold = threshold.Mul(DefaultThresholdRatio())
-	}
-	if expeditedThreshold.GT(sdkmath.LegacyOneDec()) {
-		expeditedThreshold = sdkmath.LegacyOneDec()
-	}
-	govParams.ExpeditedThreshold = expeditedThreshold.String()
-	if govParams.ExpeditedVotingPeriod != nil && govParams.VotingPeriod != nil && *govParams.ExpeditedVotingPeriod >= *govParams.VotingPeriod {
-		votingPeriod := DurationToDec(*govParams.VotingPeriod)
-		period := DecToDuration(DefaultPeriodRatio().Mul(votingPeriod))
-		govParams.ExpeditedVotingPeriod = &period
-	}
-	if err := govParams.ValidateBasic(); err != nil {
-		return err
-	}
-	return gov.Params.Set(ctx, govParams)
-}
-
-func DefaultThresholdRatio() sdkmath.LegacyDec {
-	return govv1.DefaultExpeditedThreshold.Quo(govv1.DefaultThreshold)
-}
-
-func DefaultPeriodRatio() sdkmath.LegacyDec {
-	return DurationToDec(govv1.DefaultExpeditedPeriod).Quo(DurationToDec(govv1.DefaultPeriod))
-}
-
-func DurationToDec(d time.Duration) sdkmath.LegacyDec {
-	return sdkmath.LegacyMustNewDecFromStr(fmt.Sprintf("%f", d.Seconds()))
-}
-
-func DecToDuration(d sdkmath.LegacyDec) time.Duration {
-	return time.Second * time.Duration(d.RoundInt64())
 }