diff --git a/pkg/relay/ethereum/cmd.go b/pkg/relay/ethereum/cmd.go
index 6019aaa..299ccc3 100644
--- a/pkg/relay/ethereum/cmd.go
+++ b/pkg/relay/ethereum/cmd.go
@@ -8,7 +8,6 @@ import (
 	clienttypes "github.com/cosmos/ibc-go/v8/modules/core/02-client/types"
 	chantypes "github.com/cosmos/ibc-go/v8/modules/core/04-channel/types"
 	"github.com/datachainlab/ethereum-ibc-relay-chain/pkg/contract/iibcchannelupgradablemodule"
-	"github.com/ethereum/go-ethereum/common"
 	"github.com/hyperledger-labs/yui-relayer/config"
 	"github.com/spf13/cobra"
 	"github.com/spf13/pflag"
@@ -43,7 +42,6 @@ func channelUpgradeCmd(ctx *config.Context) *cobra.Command {
 
 func proposeUpgradeCmd(ctx *config.Context) *cobra.Command {
 	const (
-		flagAppAddress       = "app-address"
 		flagOrdering         = "ordering"
 		flagConnectionHops   = "connection-hops"
 		flagVersion          = "version"
@@ -52,21 +50,13 @@ func proposeUpgradeCmd(ctx *config.Context) *cobra.Command {
 	)
 
 	cmd := cobra.Command{
-		Use:     "propose-init",
+		Use:     "propose-upgrade",
 		Aliases: []string{"propose"},
 		Args:    cobra.ExactArgs(2),
 		RunE: func(cmd *cobra.Command, args []string) error {
 			pathName := args[0]
 			chainID := args[1]
 
-			// get app address from flags
-			var appAddr common.Address
-			if appAddrHex, err := cmd.Flags().GetString(flagAppAddress); err != nil {
-				return err
-			} else {
-				appAddr = common.HexToAddress(appAddrHex)
-			}
-
 			// get ordering from flags
 			ordering, err := getOrderFromFlags(cmd.Flags(), flagOrdering)
 			if err != nil {
@@ -112,7 +102,6 @@ func proposeUpgradeCmd(ctx *config.Context) *cobra.Command {
 
 			return ethChain.ProposeUpgrade(
 				cmd.Context(),
-				appAddr,
 				ethChain.pathEnd.PortID,
 				ethChain.pathEnd.ChannelID,
 				iibcchannelupgradablemodule.UpgradeFieldsData{
@@ -128,7 +117,6 @@ func proposeUpgradeCmd(ctx *config.Context) *cobra.Command {
 		},
 	}
 
-	cmd.Flags().String(flagAppAddress, "", "IBC app module address")
 	cmd.Flags().String(flagOrdering, "", "channel ordering applied for the new channel")
 	cmd.Flags().StringSlice(flagConnectionHops, []string{}, "connection hops applied for the new channel")
 	cmd.Flags().String(flagVersion, "", "channel version applied for the new channel")
@@ -140,7 +128,6 @@ func proposeUpgradeCmd(ctx *config.Context) *cobra.Command {
 
 func allowTransitionToFlushCompleteCmd(ctx *config.Context) *cobra.Command {
 	const (
-		flagAppAddress      = "app-address"
 		flagUpgradeSequence = "upgrade-sequence"
 	)
 
@@ -152,14 +139,6 @@ func allowTransitionToFlushCompleteCmd(ctx *config.Context) *cobra.Command {
 			pathName := args[0]
 			chainID := args[1]
 
-			// get app address from flags
-			var appAddr common.Address
-			if appAddrHex, err := cmd.Flags().GetString(flagAppAddress); err != nil {
-				return err
-			} else {
-				appAddr = common.HexToAddress(appAddrHex)
-			}
-
 			// get upgrade sequence from flags
 			upgradeSequence, err := cmd.Flags().GetUint64(flagUpgradeSequence)
 			if err != nil {
@@ -177,7 +156,6 @@ func allowTransitionToFlushCompleteCmd(ctx *config.Context) *cobra.Command {
 
 			return ethChain.AllowTransitionToFlushComplete(
 				cmd.Context(),
-				appAddr,
 				ethChain.pathEnd.PortID,
 				ethChain.pathEnd.ChannelID,
 				upgradeSequence,
@@ -185,7 +163,6 @@ func allowTransitionToFlushCompleteCmd(ctx *config.Context) *cobra.Command {
 		},
 	}
 
-	cmd.Flags().String(flagAppAddress, "", "IBC app module address")
 	cmd.Flags().Uint64(flagUpgradeSequence, 0, "upgrade sequence")
 
 	return &cmd
diff --git a/pkg/relay/ethereum/upgrade.go b/pkg/relay/ethereum/upgrade.go
index 6de2043..767c8c4 100644
--- a/pkg/relay/ethereum/upgrade.go
+++ b/pkg/relay/ethereum/upgrade.go
@@ -5,18 +5,21 @@ import (
 	"fmt"
 
 	"github.com/datachainlab/ethereum-ibc-relay-chain/pkg/contract/iibcchannelupgradablemodule"
-	"github.com/ethereum/go-ethereum/common"
 	gethtypes "github.com/ethereum/go-ethereum/core/types"
 )
 
 func (c *Chain) ProposeUpgrade(
 	ctx context.Context,
-	appAddr common.Address,
 	portID string,
 	channelID string,
 	upgradeFields iibcchannelupgradablemodule.UpgradeFieldsData,
 	timeout iibcchannelupgradablemodule.TimeoutData,
 ) error {
+	appAddr, err := c.ibcHandler.GetIBCModuleByChannel(c.CallOpts(ctx, 0), portID, channelID)
+	if err != nil {
+		return err
+	}
+
 	mockApp, err := iibcchannelupgradablemodule.NewIibcchannelupgradablemodule(
 		appAddr,
 		c.client.Client,
@@ -52,11 +55,15 @@ func (c *Chain) ProposeUpgrade(
 
 func (c *Chain) AllowTransitionToFlushComplete(
 	ctx context.Context,
-	appAddr common.Address,
 	portID string,
 	channelID string,
 	upgradeSequence uint64,
 ) error {
+	appAddr, err := c.ibcHandler.GetIBCModuleByChannel(c.CallOpts(ctx, 0), portID, channelID)
+	if err != nil {
+		return err
+	}
+
 	mockApp, err := iibcchannelupgradablemodule.NewIibcchannelupgradablemodule(
 		appAddr,
 		c.client.Client,