diff --git a/Webshop.Application/Services/Admin/AdminProductService.cs b/Webshop.Application/Services/Admin/AdminProductService.cs
index 55ae97d..744bb84 100644
--- a/Webshop.Application/Services/Admin/AdminProductService.cs
+++ b/Webshop.Application/Services/Admin/AdminProductService.cs
@@ -132,7 +132,7 @@ namespace Webshop.Application.Services.Admin
                 image.DisplayOrder = currentOrder++;
             }
 
-            await _productRepository.UpdateProductAsync();
+            await _productRepository.UpdateProductAsync(existingProduct);
 
             return ServiceResult.Ok();
         }
diff --git a/Webshop.Domain/Interfaces/IProductRepository.cs b/Webshop.Domain/Interfaces/IProductRepository.cs
index 32090ca..152b5ce 100644
--- a/Webshop.Domain/Interfaces/IProductRepository.cs
+++ b/Webshop.Domain/Interfaces/IProductRepository.cs
@@ -13,7 +13,7 @@ namespace Webshop.Domain.Interfaces
         Task<Product?> GetBySlugAsync(string slug);
         Task AddProductAsync(Product product);
         Task<Product?> GetProductByIdForUpdateAsync(Guid id); // NEU
-        Task UpdateProductAsync();                           // GEÄNDERT (parameterlos)
+        Task UpdateProductAsync(Product product);                
         Task DeleteProductAsync(Guid id);
     }
 }
\ No newline at end of file
diff --git a/Webshop.Infrastructure/Repositories/ProductRepository.cs b/Webshop.Infrastructure/Repositories/ProductRepository.cs
index 066a7f4..e5f32cb 100644
--- a/Webshop.Infrastructure/Repositories/ProductRepository.cs
+++ b/Webshop.Infrastructure/Repositories/ProductRepository.cs
@@ -49,8 +49,14 @@ namespace Webshop.Infrastructure.Repositories
         }
 
         // --- KORRIGIERTE UPDATE-METHODE (OHNE PARAMETER) ---
-        public async Task UpdateProductAsync()
+        public async Task UpdateProductAsync(Product product)
         {
+            // Wir sagen dem DbContext explizit, dass der Zustand dieser Entität "Modifiziert" ist.
+            // Das zwingt EF Core dazu, ALLE Eigenschaften der Entität in der UPDATE-Anweisung zu berücksichtigen.
+            // Es umgeht alle möglichen Probleme mit dem Change Tracking, die durch verschiedene Kontexte 
+            // oder komplexe Beziehungs-Updates entstehen können.
+            _context.Entry(product).State = EntityState.Modified;
+
             await _context.SaveChangesAsync();
         }