diff --git a/LehrerApp.Desktop.Tests/SettingsViewModelTests.cs b/LehrerApp.Desktop.Tests/SettingsViewModelTests.cs
index 5347cf5..f97691c 100644
--- a/LehrerApp.Desktop.Tests/SettingsViewModelTests.cs
+++ b/LehrerApp.Desktop.Tests/SettingsViewModelTests.cs
@@ -513,6 +513,35 @@ public sealed class SettingsViewModelTests
         Assert.Equal([0, 1], stored.Select(x => x.SortOrder));
     }
 
+    [Fact]
+    public void Kompetenzkatalog_Aktualisieren_ZeigtNachtraeglicheMcpAenderung()
+    {
+        var subject = new Subject { Name = "Naturwissenschaften", ShortName = "Nawi" };
+        var repository = new FakeCompetencyDomains();
+        var versions = new FakeCompetencyCatalogVersions();
+        var version = versions.GetOrCreateDefault(subject.Id);
+        var vm = BuildViewModel(subjects: new FakeSubjects([subject]), competencyDomains: repository,
+            competencyVersions: versions);
+        vm.CatalogSubject = vm.Subjects.Single();
+
+        Assert.True(vm.HasNoCatalogDomains);
+
+        repository.Add(new CompetencyDomain
+        {
+            SubjectId = subject.Id,
+            GradeLevel = 10,
+            VersionId = version.Id,
+            Name = "Erkenntnisgewinnung",
+            Items = [new CompetencyItem { Code = "EG1", Description = "Modelle verwenden" }],
+        });
+
+        vm.RefreshCompetencyCatalogCommand.Execute(null);
+
+        var domain = Assert.Single(vm.Domains);
+        Assert.Equal("Erkenntnisgewinnung", domain.Name);
+        Assert.False(vm.HasNoCatalogDomains);
+    }
+
     [Fact]
     public void Kompetenzen_Umsortieren_PersistiertSortOrder()
     {
diff --git a/LehrerApp.Desktop/ViewModels/Settings/SettingsViewModel.Competencies.cs b/LehrerApp.Desktop/ViewModels/Settings/SettingsViewModel.Competencies.cs
index 58a3fee..607c1fe 100644
--- a/LehrerApp.Desktop/ViewModels/Settings/SettingsViewModel.Competencies.cs
+++ b/LehrerApp.Desktop/ViewModels/Settings/SettingsViewModel.Competencies.cs
@@ -31,6 +31,10 @@ public partial class SettingsViewModel
 
     public ObservableCollection<DomainEditItem> Domains { get; } = [];
     public ObservableCollection<CompetencyCatalogVersion> CatalogVersions { get; } = [];
+    public bool HasNoCatalogDomains => CatalogSubject is not null && CatalogVersion is not null && Domains.Count == 0;
+    public string EmptyCatalogMessage => CatalogSubject is null || CatalogVersion is null
+        ? ""
+        : $"Keine Kompetenzbereiche für {CatalogSubject.Name}, Klasse {CatalogGradeLevel}, Version „{CatalogVersion.Name}“ hinterlegt.";
 
     // ── Katalog: Laden ────────────────────────────────────────────────────────
 
@@ -38,6 +42,28 @@ public partial class SettingsViewModel
     partial void OnCatalogGradeLevelChanged(int value)            => LoadCatalog();
     partial void OnCatalogVersionChanged(CompetencyCatalogVersion? value) => LoadCatalog();
 
+    [RelayCommand]
+    private void RefreshCompetencyCatalog()
+    {
+        var selectedSubjectId = CatalogSubject?.Id;
+        var selectedVersionId = CatalogVersion?.Id;
+
+        LoadSubjects();
+        if (selectedSubjectId is not Guid subjectId)
+        {
+            LoadCatalog();
+            return;
+        }
+
+        CatalogSubject = Subjects.FirstOrDefault(s => s.Id == subjectId);
+        if (CatalogSubject is null) return;
+
+        CatalogVersion = CatalogVersions.FirstOrDefault(v => v.Id == selectedVersionId)
+                         ?? CatalogVersions.FirstOrDefault(v => v.IsDefault)
+                         ?? CatalogVersions.FirstOrDefault();
+        LoadCatalog();
+    }
+
     private void LoadVersions()
     {
         var selectedId = CatalogVersion?.Id;
@@ -56,10 +82,17 @@ public partial class SettingsViewModel
     {
         Domains.Clear();
         CatalogValidation = "";
-        if (CatalogSubject is null || CatalogVersion is null) return;
+        if (CatalogSubject is null || CatalogVersion is null)
+        {
+            OnPropertyChanged(nameof(HasNoCatalogDomains));
+            OnPropertyChanged(nameof(EmptyCatalogMessage));
+            return;
+        }
         foreach (var d in _domainRepo.GetBySubjectAndGrade(CatalogSubject.Id, CatalogGradeLevel, CatalogVersion.Id))
             Domains.Add(CreateDomainEditItem(d));
         RefreshDomainMoveState();
+        OnPropertyChanged(nameof(HasNoCatalogDomains));
+        OnPropertyChanged(nameof(EmptyCatalogMessage));
     }
 
     // ── Versionen (Bildungspläne) verwalten ──────────────────────────────────
@@ -120,6 +153,8 @@ public partial class SettingsViewModel
         _domainRepo.Save(domain);
         Domains.Add(CreateDomainEditItem(domain));
         RefreshDomainMoveState();
+        OnPropertyChanged(nameof(HasNoCatalogDomains));
+        OnPropertyChanged(nameof(EmptyCatalogMessage));
         NewDomainName = ""; NewDomainCode = ""; CatalogValidation = "";
     }
 
@@ -130,6 +165,8 @@ public partial class SettingsViewModel
         _domainRepo.Delete(item.Id);
         Domains.Remove(item);
         PersistDomainOrder();
+        OnPropertyChanged(nameof(HasNoCatalogDomains));
+        OnPropertyChanged(nameof(EmptyCatalogMessage));
     }
 
     private DomainEditItem CreateDomainEditItem(CompetencyDomain domain) =>
diff --git a/LehrerApp.Desktop/ViewModels/Settings/SettingsViewModel.cs b/LehrerApp.Desktop/ViewModels/Settings/SettingsViewModel.cs
index ef4857f..1b78fa0 100644
--- a/LehrerApp.Desktop/ViewModels/Settings/SettingsViewModel.cs
+++ b/LehrerApp.Desktop/ViewModels/Settings/SettingsViewModel.cs
@@ -67,6 +67,12 @@ public partial class SettingsViewModel : ObservableObject
 
     [ObservableProperty] private int _activeTabIndex;
 
+    partial void OnActiveTabIndexChanged(int value)
+    {
+        if (value == (int)SettingsTab.Competencies)
+            RefreshCompetencyCatalog();
+    }
+
     // ── Konstruktor ───────────────────────────────────────────────────────────
 
     private readonly ISchoolHolidayRepository _schoolHolidays;
diff --git a/LehrerApp.Desktop/Views/Settings/SettingsView.axaml b/LehrerApp.Desktop/Views/Settings/SettingsView.axaml
index cefe0fd..8489faf 100644
--- a/LehrerApp.Desktop/Views/Settings/SettingsView.axaml
+++ b/LehrerApp.Desktop/Views/Settings/SettingsView.axaml
@@ -149,6 +149,9 @@
                       IsEnabled="{Binding CatalogSubject, Converter={x:Static ObjectConverters.IsNotNull}}"
                       ToolTip.Tip="Katalog in eine andere Klassenstufe (derselben Version) kopieren"/>
             </Grid>
+            <Button Content="Katalog aktualisieren" Command="{Binding RefreshCompetencyCatalogCommand}"
+                    HorizontalAlignment="Right"
+                    ToolTip.Tip="Fächer, Versionen und Kompetenzen neu aus der Datenbank laden"/>
 
             <!-- Bildungsplan-Versionen verwalten -->
             <Border BorderBrush="{DynamicResource SystemControlForegroundBaseLowBrush}"
@@ -193,6 +196,8 @@
             <!-- Leerer Zustand -->
             <TextBlock Text="Kein Fach ausgewählt." Classes="emptyhint"
                        IsVisible="{Binding CatalogSubject, Converter={x:Static ObjectConverters.IsNull}}"/>
+            <TextBlock Text="{Binding EmptyCatalogMessage}" Classes="emptyhint" TextWrapping="Wrap"
+                       IsVisible="{Binding HasNoCatalogDomains}"/>
 
             <!-- Domain-Liste -->
             <ItemsControl ItemsSource="{Binding Domains}"