diff --git a/Assets/Scripts/EnemyAIController.cs b/Assets/Scripts/EnemyAIController.cs
index 6cb5853..e16b811 100644
--- a/Assets/Scripts/EnemyAIController.cs
+++ b/Assets/Scripts/EnemyAIController.cs
@@ -671,6 +671,7 @@ namespace Northbound
         private void DecayAggro()
         {
             List<ulong> keysToRemove = new List<ulong>();
+            List<KeyValuePair<ulong, float>> updates = new List<KeyValuePair<ulong, float>>();
 
             foreach (var kvp in _aggroTable)
             {
@@ -681,10 +682,16 @@ namespace Northbound
                 }
                 else
                 {
-                    _aggroTable[kvp.Key] = newAggro;
+                    updates.Add(new KeyValuePair<ulong, float>(kvp.Key, newAggro));
                 }
             }
 
+            // 순회 후 수정 적용
+            foreach (var update in updates)
+            {
+                _aggroTable[update.Key] = update.Value;
+            }
+
             // 어그로가 0 이하인 항목 제거
             foreach (var key in keysToRemove)
             {