diff --git a/app/app.go b/app/app.go
index d41ab02..bed98c8 100644
--- a/app/app.go
+++ b/app/app.go
@@ -2,6 +2,7 @@ package app
 
 import (
 	"encoding/json"
+	"errors"
 	"fmt"
 	"io"
 	"os"
@@ -465,6 +466,17 @@ func New(
 		authtypes.NewModuleAddress(govtypes.ModuleName).String(),
 	)
 
+	// Register store loader for v0.13.0 upgrade (DER module)
+	derUpgradeHeight, err := getDerUpgradeHeightFromConfig(homePath)
+	if err != nil {
+		logger.Error("failed to get DER upgrade height from config", "error", err)
+	}
+	app.SetStoreLoader(
+		upgradetypes.UpgradeStoreLoader(derUpgradeHeight, &storetypes.StoreUpgrades{
+			Added: []string{dermoduletypes.StoreKey},
+		}),
+	)
+
 	// ... other modules keepers
 
 	// Create IBC Keeper
@@ -1037,4 +1049,27 @@ func (app *App) setupUpgradeHandlers() {
 	app.UpgradeKeeper.SetUpgradeHandler("v0.11.0", func(ctx sdk.Context, _ upgradetypes.Plan, fromVM module.VersionMap) (module.VersionMap, error) {
 		return app.mm.RunMigrations(ctx, app.configurator, fromVM)
 	})
+	app.UpgradeKeeper.SetUpgradeHandler("v0.13.0", func(ctx sdk.Context, _ upgradetypes.Plan, fromVM module.VersionMap) (module.VersionMap, error) {
+		ctx.Logger().Info("Running v0.13.0 upgrade: adding der store")
+		return app.mm.RunMigrations(ctx, app.configurator, fromVM)
+	})
+}
+
+// Utility function to get DER upgrade height from config/upgrade-v0.13.0.json
+func getDerUpgradeHeightFromConfig(homePath string) (int64, error) {
+	configPath := filepath.Join(homePath, "config", "upgrade-v0.13.0.json")
+	data, err := os.ReadFile(configPath)
+	if err != nil {
+		return 0, fmt.Errorf("failed to read DER upgrade config: %w", err)
+	}
+	var cfg struct {
+		DerUpgradeHeight int64 `json:"der-upgrade-height"`
+	}
+	if err := json.Unmarshal(data, &cfg); err != nil {
+		return 0, fmt.Errorf("failed to parse DER upgrade config: %w", err)
+	}
+	if cfg.DerUpgradeHeight <= 0 {
+		return 0, errors.New("DER upgrade height must be set and > 0 in config/upgrade-v0.13.0.json")
+	}
+	return cfg.DerUpgradeHeight, nil
 }
diff --git a/x/der/keeper/der_asset_test.go b/x/der/keeper/der_asset_test.go
index e04b1bc..02576cb 100644
--- a/x/der/keeper/der_asset_test.go
+++ b/x/der/keeper/der_asset_test.go
@@ -1,9 +1,10 @@
 package keeper
 
 import (
+	"testing"
+
 	dertypes "github.com/planetmint/planetmint-go/x/der/types"
 	"github.com/stretchr/testify/require"
-	"testing"
 )
 
 func TestStoreDerAssetAndLookupDerAsset(t *testing.T) {