diff --git a/Assets/Scripts/Turret.cs b/Assets/Scripts/Turret.cs
index 64bf8bc..4095cb0 100644
--- a/Assets/Scripts/Turret.cs
+++ b/Assets/Scripts/Turret.cs
@@ -25,7 +25,7 @@ public class Turret : MonoBehaviour
     public float Damage => _damage;
     public float Distance => _distance;
     public int SellPrice => Mathf.RoundToInt(_price * _sellingMultiplier);
-    public int UpgradeCost => Mathf.RoundToInt(_price * _upgradeCostMultiplier);
+    public int UpgradeCost => Mathf.CeilToInt(_price * _upgradeCostMultiplier);
 
     private void Start()
     {
diff --git a/Assets/Scripts/TurretUpdater.cs b/Assets/Scripts/TurretUpdater.cs
index 9763b83..9d00833 100644
--- a/Assets/Scripts/TurretUpdater.cs
+++ b/Assets/Scripts/TurretUpdater.cs
@@ -10,6 +10,7 @@ public class TurretUpdater : MonoBehaviour
     [SerializeField] private Button _sellButton;
     [SerializeField] private Button _upgradeButton;
     [SerializeField] private UnityEvent<Turret> _onTurretClicked;
+    [SerializeField] private UnityEvent<Turret> _onTurretUpgraded;
 
     public event UnityAction<Turret> OnTurretClicked
     {
@@ -17,6 +18,12 @@ public class TurretUpdater : MonoBehaviour
         remove => _onTurretClicked.RemoveListener(value);
     }
 
+    public event UnityAction<Turret> OnTurretUpgraded
+    {
+        add => _onTurretUpgraded.AddListener(value);
+        remove => _onTurretUpgraded.RemoveListener(value);
+    }
+
     private Turret _clickedTurret;
     private bool _isDestroyingTurret;
 
@@ -81,6 +88,7 @@ public class TurretUpdater : MonoBehaviour
 
         _wallet.TakeMoney(ClickedTurret.UpgradeCost);
         ClickedTurret.Upgrade();
+        _onTurretUpgraded?.Invoke(ClickedTurret);
     }
 
     private void SellTurret()
diff --git a/Assets/Scripts/UI/TurretUpgradeViewer.cs b/Assets/Scripts/UI/TurretUpgradeViewer.cs
index e2ecb8a..535a19d 100644
--- a/Assets/Scripts/UI/TurretUpgradeViewer.cs
+++ b/Assets/Scripts/UI/TurretUpgradeViewer.cs
@@ -1,5 +1,6 @@
 using UnityEngine;
 using UnityEngine.UI;
+using static UnityEngine.GraphicsBuffer;
 
 public class TurretUpgradeViewer : MonoBehaviour
 {
@@ -15,12 +16,14 @@ public class TurretUpgradeViewer : MonoBehaviour
     {
         _wallet.OnMoneyChanged += OnMoneyChanged;
         _turretUpdater.OnTurretClicked += OnTurretClicked;
+        _turretUpdater.OnTurretUpgraded += UpdateBtn;
     }
 
     private void OnDisable()
     {
         _wallet.OnMoneyChanged -= OnMoneyChanged;
         _turretUpdater.OnTurretClicked -= OnTurretClicked;
+        _turretUpdater.OnTurretUpgraded -= UpdateBtn;
     }
 
     private void OnMoneyChanged(int newMoney)
@@ -37,6 +40,11 @@ public class TurretUpgradeViewer : MonoBehaviour
         }
         
         _viewerHolder.gameObject.SetActive(true);
+        UpdateBtn(turret);
+    }
+
+    private void UpdateBtn(Turret turret)
+    {
         _upgradeCost = turret.UpgradeCost;
         _upgradeCostText.text = _upgradeCost.ToString();
         _upgradeButton.interactable = _wallet.Money >= _upgradeCost;