diff --git a/src/DigitalData.UserManager.Application/Services/GroupService.cs b/src/DigitalData.UserManager.Application/Services/GroupService.cs
index f941780..955daa4 100644
--- a/src/DigitalData.UserManager.Application/Services/GroupService.cs
+++ b/src/DigitalData.UserManager.Application/Services/GroupService.cs
@@ -5,6 +5,8 @@ using DigitalData.UserManager.Domain.Entities;
 using DigitalData.UserManager.Application.Contracts.Repositories;
 using Microsoft.Extensions.Localization;
 using DigitalData.Core.Abstraction.Application.DTO;
+using DigitalData.Core.Abstraction.Application;
+using DigitalData.Core.Exceptions;
 
 namespace DigitalData.UserManager.Application.Services
 {
@@ -34,5 +36,16 @@ namespace DigitalData.UserManager.Application.Services
             else
                 return Result.Success(createdGroup.Id);
         }
+
+        public async override Task<Result> UpdateAsync<TUpdateDto>(TUpdateDto updateDto)
+        {
+            var gId = updateDto.GetId<int>();
+            var group = await _repository.ReadByIdAsync(gId);
+            if (group is null)
+                throw new ForbiddenException("Group not found.");
+            else if (!group.Internal)
+                throw new ForbiddenException("Updates are not allowed for system groups.");
+            return await base.UpdateAsync(updateDto);
+        }
     }
 }
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