diff --git a/x/observer/migrations/v4/migrate_test.go b/x/observer/migrations/v4/migrate_test.go
index 3a64fd97ab..b7d025fa60 100644
--- a/x/observer/migrations/v4/migrate_test.go
+++ b/x/observer/migrations/v4/migrate_test.go
@@ -4,12 +4,8 @@ import (
 	"testing"
 
 	"github.com/cosmos/cosmos-sdk/store/prefix"
-	sdk "github.com/cosmos/cosmos-sdk/types"
 	"github.com/stretchr/testify/assert"
-	"github.com/stretchr/testify/require"
-	"github.com/zeta-chain/zetacore/common"
 	keepertest "github.com/zeta-chain/zetacore/testutil/keeper"
-	"github.com/zeta-chain/zetacore/testutil/sample"
 	v4 "github.com/zeta-chain/zetacore/x/observer/migrations/v4"
 	"github.com/zeta-chain/zetacore/x/observer/types"
 )
@@ -33,75 +29,3 @@ func TestMigrateCrosschainFlags(t *testing.T) {
 	assert.True(t, flags.BlockHeaderVerificationFlags.IsBtcTypeChainEnabled)
 	assert.True(t, flags.BlockHeaderVerificationFlags.IsEthTypeChainEnabled)
 }
-
-func TestMigrateObserverParams(t *testing.T) {
-	k, ctx := keepertest.ObserverKeeper(t)
-
-	// set chain params
-	previousChainParamsList := types.ChainParamsList{
-		ChainParams: []*types.ChainParams{
-			sample.ChainParams(1),
-			sample.ChainParams(2),
-			sample.ChainParams(3),
-			sample.ChainParams(4),
-		},
-	}
-	k.SetChainParamsList(ctx, previousChainParamsList)
-
-	// set observer params
-	dec42, err := sdk.NewDecFromStr("0.42")
-	require.NoError(t, err)
-	dec43, err := sdk.NewDecFromStr("0.43")
-	require.NoError(t, err)
-	dec1000, err := sdk.NewDecFromStr("1000.0")
-	require.NoError(t, err)
-	dec1001, err := sdk.NewDecFromStr("1001.0")
-	require.NoError(t, err)
-	params := types.Params{
-		ObserverParams: []*types.ObserverParams{
-			{
-				Chain:                 &common.Chain{ChainId: 2},
-				BallotThreshold:       dec42,
-				MinObserverDelegation: dec1000,
-				IsSupported:           true,
-			},
-			{
-				Chain:                 &common.Chain{ChainId: 3},
-				BallotThreshold:       dec43,
-				MinObserverDelegation: dec1001,
-				IsSupported:           true,
-			},
-		},
-	}
-	k.SetParams(ctx, params)
-
-	// perform migration
-	err = v4.MigrateObserverParams(ctx, *k)
-	require.NoError(t, err)
-
-	// check chain params
-	newChainParamsList, found := k.GetChainParamsList(ctx)
-	require.True(t, found)
-
-	// unchanged values
-	require.EqualValues(t, previousChainParamsList.ChainParams[0], newChainParamsList.ChainParams[0])
-	require.EqualValues(t, previousChainParamsList.ChainParams[3], newChainParamsList.ChainParams[3])
-
-	// changed values
-	require.EqualValues(t, dec42, newChainParamsList.ChainParams[1].BallotThreshold)
-	require.EqualValues(t, dec1000, newChainParamsList.ChainParams[1].MinObserverDelegation)
-	require.EqualValues(t, dec43, newChainParamsList.ChainParams[2].BallotThreshold)
-	require.EqualValues(t, dec1001, newChainParamsList.ChainParams[2].MinObserverDelegation)
-	require.True(t, newChainParamsList.ChainParams[1].IsSupported)
-	require.True(t, newChainParamsList.ChainParams[2].IsSupported)
-
-	// check remaining values are unchanged
-	previousChainParamsList.ChainParams[1].BallotThreshold = dec42
-	previousChainParamsList.ChainParams[2].BallotThreshold = dec43
-	previousChainParamsList.ChainParams[1].MinObserverDelegation = dec1000
-	previousChainParamsList.ChainParams[2].MinObserverDelegation = dec1001
-	previousChainParamsList.ChainParams[1].IsSupported = true
-	previousChainParamsList.ChainParams[2].IsSupported = true
-	require.EqualValues(t, previousChainParamsList.ChainParams[1], newChainParamsList.ChainParams[1])
-	require.EqualValues(t, previousChainParamsList.ChainParams[2], newChainParamsList.ChainParams[2])
-}
diff --git a/x/observer/migrations/v5/migrate_test.go b/x/observer/migrations/v5/migrate_test.go
index 61e2c86739..d97b3dde69 100644
--- a/x/observer/migrations/v5/migrate_test.go
+++ b/x/observer/migrations/v5/migrate_test.go
@@ -6,13 +6,15 @@ import (
 	"github.com/cosmos/cosmos-sdk/store/prefix"
 	sdk "github.com/cosmos/cosmos-sdk/types"
 	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+	"github.com/zeta-chain/zetacore/common"
 	keepertest "github.com/zeta-chain/zetacore/testutil/keeper"
 	"github.com/zeta-chain/zetacore/testutil/sample"
 	v5 "github.com/zeta-chain/zetacore/x/observer/migrations/v5"
 	"github.com/zeta-chain/zetacore/x/observer/types"
 )
 
-func TestMigrateStore(t *testing.T) {
+func TestMigrateObserverMapper(t *testing.T) {
 	t.Run("TestMigrateStore", func(t *testing.T) {
 		k, ctx := keepertest.ObserverKeeper(t)
 		legacyObserverMapperStore := prefix.NewStore(ctx.KVStore(k.StoreKey()), types.KeyPrefix(types.ObserverMapperKey))
@@ -20,7 +22,7 @@ func TestMigrateStore(t *testing.T) {
 		for _, legacyObserverMapper := range legacyObserverMapperList {
 			legacyObserverMapperStore.Set(types.KeyPrefix(legacyObserverMapper.Index), k.Codec().MustMarshal(legacyObserverMapper))
 		}
-		err := v5.MigrateStore(ctx, k.StoreKey(), k.Codec())
+		err := v5.MigrateObserverMapper(ctx, k.StoreKey(), k.Codec())
 		assert.NoError(t, err)
 		observerSet, found := k.GetObserverSet(ctx)
 		assert.True(t, found)
@@ -40,3 +42,75 @@ func TestMigrateStore(t *testing.T) {
 		assert.Equal(t, 0, len(observerMappers))
 	})
 }
+
+func TestMigrateObserverParams(t *testing.T) {
+	k, ctx := keepertest.ObserverKeeper(t)
+
+	// set chain params
+	previousChainParamsList := types.ChainParamsList{
+		ChainParams: []*types.ChainParams{
+			sample.ChainParams(1),
+			sample.ChainParams(2),
+			sample.ChainParams(3),
+			sample.ChainParams(4),
+		},
+	}
+	k.SetChainParamsList(ctx, previousChainParamsList)
+
+	// set observer params
+	dec42, err := sdk.NewDecFromStr("0.42")
+	require.NoError(t, err)
+	dec43, err := sdk.NewDecFromStr("0.43")
+	require.NoError(t, err)
+	dec1000, err := sdk.NewDecFromStr("1000.0")
+	require.NoError(t, err)
+	dec1001, err := sdk.NewDecFromStr("1001.0")
+	require.NoError(t, err)
+	params := types.Params{
+		ObserverParams: []*types.ObserverParams{
+			{
+				Chain:                 &common.Chain{ChainId: 2},
+				BallotThreshold:       dec42,
+				MinObserverDelegation: dec1000,
+				IsSupported:           true,
+			},
+			{
+				Chain:                 &common.Chain{ChainId: 3},
+				BallotThreshold:       dec43,
+				MinObserverDelegation: dec1001,
+				IsSupported:           true,
+			},
+		},
+	}
+	k.SetParams(ctx, params)
+
+	// perform migration
+	err = v5.MigrateObserverParams(ctx, *k)
+	require.NoError(t, err)
+
+	// check chain params
+	newChainParamsList, found := k.GetChainParamsList(ctx)
+	require.True(t, found)
+
+	// unchanged values
+	require.EqualValues(t, previousChainParamsList.ChainParams[0], newChainParamsList.ChainParams[0])
+	require.EqualValues(t, previousChainParamsList.ChainParams[3], newChainParamsList.ChainParams[3])
+
+	// changed values
+	require.EqualValues(t, dec42, newChainParamsList.ChainParams[1].BallotThreshold)
+	require.EqualValues(t, dec1000, newChainParamsList.ChainParams[1].MinObserverDelegation)
+	require.EqualValues(t, dec43, newChainParamsList.ChainParams[2].BallotThreshold)
+	require.EqualValues(t, dec1001, newChainParamsList.ChainParams[2].MinObserverDelegation)
+	require.True(t, newChainParamsList.ChainParams[1].IsSupported)
+	require.True(t, newChainParamsList.ChainParams[2].IsSupported)
+
+	// check remaining values are unchanged
+	previousChainParamsList.ChainParams[1].BallotThreshold = dec42
+	previousChainParamsList.ChainParams[2].BallotThreshold = dec43
+	previousChainParamsList.ChainParams[1].MinObserverDelegation = dec1000
+	previousChainParamsList.ChainParams[2].MinObserverDelegation = dec1001
+	previousChainParamsList.ChainParams[1].IsSupported = true
+	previousChainParamsList.ChainParams[2].IsSupported = true
+	require.EqualValues(t, previousChainParamsList.ChainParams[1], newChainParamsList.ChainParams[1])
+	require.EqualValues(t, previousChainParamsList.ChainParams[2], newChainParamsList.ChainParams[2])
+}