Index: ChapterX.Application/Collaboration/Commands/UpdateHandler.cs
===================================================================
--- ChapterX.Application/Collaboration/Commands/UpdateHandler.cs	(revision 877c13c3dd0934c1d31da7988d0d2c2c5925ed55)
+++ ChapterX.Application/Collaboration/Commands/UpdateHandler.cs	(revision e882b92860e1899312f197af1134bb0f33d30d15)
@@ -22,5 +22,6 @@
                 return new UpdateResponse(false);
 
-            // No updatable fields on Collaboration entity
+            collaboration.Role = request.Role;
+            collaboration.PermissionLevel = request.PermissionLevel;
 
             await _collaborationRepository.UpdateAsync(collaboration, cancellationToken);