diff --git a/server/internal/tenant/app/kol_profile_service.go b/server/internal/tenant/app/kol_profile_service.go
index 0bbe5ee..d39b11f 100644
--- a/server/internal/tenant/app/kol_profile_service.go
+++ b/server/internal/tenant/app/kol_profile_service.go
@@ -15,6 +15,12 @@ type KolProfileService struct {
 	repo repository.KolProfileRepository
 }
 
+type UpdateKolProfileServiceInput struct {
+	DisplayName string
+	Bio         *string
+	AvatarURL   *string
+}
+
 type KolProfileResponse struct {
 	ID            int64     `json:"id"`
 	TenantID      int64     `json:"tenant_id"`
@@ -43,6 +49,44 @@ func (s *KolProfileService) RequireActiveKol(ctx context.Context, actor auth.Act
 	return profile, nil
 }
 
+func (s *KolProfileService) UpdateProfile(ctx context.Context, actor auth.Actor, input UpdateKolProfileServiceInput) (*repository.KolProfile, error) {
+	profile, err := s.RequireActiveKol(ctx, actor)
+	if err != nil {
+		return nil, err
+	}
+
+	displayName, err := validateKolDisplayName(input.DisplayName)
+	if err != nil {
+		return nil, err
+	}
+	bio, err := validateKolBio(input.Bio)
+	if err != nil {
+		return nil, err
+	}
+	avatarURL, err := validateKolAvatarURL(input.AvatarURL)
+	if err != nil {
+		return nil, err
+	}
+
+	if err := s.repo.Update(ctx, actor.TenantID, repository.UpdateKolProfileInput{
+		ID:          profile.ID,
+		DisplayName: displayName,
+		Bio:         bio,
+		AvatarURL:   avatarURL,
+	}); err != nil {
+		return nil, response.ErrInternal(50062, "kol_profile_update_failed", err.Error())
+	}
+
+	updated, err := s.repo.GetByID(ctx, profile.ID)
+	if err != nil {
+		return nil, response.ErrInternal(50061, "kol_profile_query_failed", err.Error())
+	}
+	if updated == nil {
+		return nil, ErrNotActiveKol
+	}
+	return updated, nil
+}
+
 func NewKolProfileResponse(profile *repository.KolProfile) *KolProfileResponse {
 	if profile == nil {
 		return nil