diff --git a/Webshop.Application/DTOs/Products/AdminProductDto.cs b/Webshop.Application/DTOs/Products/AdminProductDto.cs
index 903db66..4b7d8b2 100644
--- a/Webshop.Application/DTOs/Products/AdminProductDto.cs
+++ b/Webshop.Application/DTOs/Products/AdminProductDto.cs
@@ -27,5 +27,6 @@ namespace Webshop.Application.DTOs.Products
         // << NEU >>
         public bool IsFeatured { get; set; }
         public int FeaturedDisplayOrder { get; set; }
+        public byte[] RowVersion { get; set; }
     }
 }
\ No newline at end of file
diff --git a/Webshop.Application/DTOs/Products/UpdateAdminProductDto.cs b/Webshop.Application/DTOs/Products/UpdateAdminProductDto.cs
index 23c98a4..61a02af 100644
--- a/Webshop.Application/DTOs/Products/UpdateAdminProductDto.cs
+++ b/Webshop.Application/DTOs/Products/UpdateAdminProductDto.cs
@@ -35,5 +35,7 @@ namespace Webshop.Application.DTOs.Products
         public decimal? PurchasePrice { get; set; }
         public bool IsFeatured { get; set; }
         public int FeaturedDisplayOrder { get; set; }
+        [Required]
+        public byte[] RowVersion { get; set; }
     }
 }
\ No newline at end of file
diff --git a/Webshop.Application/Services/Admin/AdminProductService.cs b/Webshop.Application/Services/Admin/AdminProductService.cs
index 88bb174..7c8e5c1 100644
--- a/Webshop.Application/Services/Admin/AdminProductService.cs
+++ b/Webshop.Application/Services/Admin/AdminProductService.cs
@@ -151,6 +151,7 @@ namespace Webshop.Application.Services.Admin
                     existingProduct.Images.Add(new ProductImage { Url = url, IsMainImage = false, DisplayOrder = displayOrder++ });
                 }
             }
+            _context.Entry(existingProduct).Property(p => p.RowVersion).OriginalValue = productDto.RowVersion;
 
             // --- EIGENSCHAFTEN-UPDATE ---
             Console.WriteLine("---- AKTUALISIERE PRODUKT-EIGENSCHAFTEN ----");
diff --git a/Webshop.Domain/Entities/Product.cs b/Webshop.Domain/Entities/Product.cs
index 82f2896..6550116 100644
--- a/Webshop.Domain/Entities/Product.cs
+++ b/Webshop.Domain/Entities/Product.cs
@@ -53,5 +53,7 @@ namespace Webshop.Domain.Entities
         public virtual ICollection<ProductDiscount> ProductDiscounts { get; set; } = new List<ProductDiscount>();
         public virtual ICollection<Productcategorie> Productcategories { get; set; } = new List<Productcategorie>();
         public virtual ICollection<ProductImage> Images { get; set; } = new List<ProductImage>();
+        [Timestamp] // Diese Annotation ist entscheidend!
+        public byte[] RowVersion { get; set; }
     }
 }
\ No newline at end of file