diff --git a/Minint.Core/Models/MinintDocument.cs b/Minint.Core/Models/MinintDocument.cs
index 5640a1b..e076b47 100644
--- a/Minint.Core/Models/MinintDocument.cs
+++ b/Minint.Core/Models/MinintDocument.cs
@@ -65,7 +65,7 @@ public sealed class MinintDocument
     public int FindColorCached(RgbaColor color)
     {
         var cache = EnsurePaletteCache();
-        return cache.TryGetValue(color, out int idx) ? idx : -1;
+        return cache.GetValueOrDefault(color, -1);
     }
 
     /// <summary>
diff --git a/Minint.Core/Services/Impl/ImageEffectsService.cs b/Minint.Core/Services/Impl/ImageEffectsService.cs
index 67c25f6..9a04f99 100644
--- a/Minint.Core/Services/Impl/ImageEffectsService.cs
+++ b/Minint.Core/Services/Impl/ImageEffectsService.cs
@@ -1,4 +1,3 @@
-using System;
 using Minint.Core.Models;
 
 namespace Minint.Core.Services.Impl;
diff --git a/Minint/ViewModels/EditorViewModel.cs b/Minint/ViewModels/EditorViewModel.cs
index 3472126..e167f89 100644
--- a/Minint/ViewModels/EditorViewModel.cs
+++ b/Minint/ViewModels/EditorViewModel.cs
@@ -2,7 +2,6 @@ using System;
 using System.Collections.Generic;
 using System.Collections.ObjectModel;
 using System.ComponentModel;
-using System.Linq;
 using Avalonia;
 using Avalonia.Media.Imaging;
 using Avalonia.Threading;
diff --git a/Minint/ViewModels/MainWindowViewModel.cs b/Minint/ViewModels/MainWindowViewModel.cs
index 5251e7c..1b96cf0 100644
--- a/Minint/ViewModels/MainWindowViewModel.cs
+++ b/Minint/ViewModels/MainWindowViewModel.cs
@@ -6,7 +6,6 @@ using Avalonia.Controls;
 using Avalonia.Platform.Storage;
 using CommunityToolkit.Mvvm.ComponentModel;
 using CommunityToolkit.Mvvm.Input;
-using Minint.Core.Models;
 using Minint.Core.Services;
 using Minint.Core.Services.Impl;
 using Minint.Infrastructure.Export;