diff --git a/Engine.Input/KeyboardInputsBehaviour.cs b/Engine.Input/KeyboardInputsBehaviour.cs
index cb29144..514214a 100644
--- a/Engine.Input/KeyboardInputsBehaviour.cs
+++ b/Engine.Input/KeyboardInputsBehaviour.cs
@@ -7,14 +7,14 @@ namespace Syntriax.Engine.Input;
 
 public class KeyboardInputsBehaviour : BehaviourOverride, IKeyboardInputs
 {
-    private IDictionary<Keys, Action<IKeyboardInputs, Keys>> OnPressed = new Dictionary<Keys, Action<IKeyboardInputs, Keys>>(256);
-    private IDictionary<Keys, Action<IKeyboardInputs, Keys>> OnReleased = new Dictionary<Keys, Action<IKeyboardInputs, Keys>>(256);
+    private readonly Dictionary<Keys, Action<IKeyboardInputs, Keys>> OnPressed = new(256);
+    private readonly Dictionary<Keys, Action<IKeyboardInputs, Keys>> OnReleased = new(256);
 
     private int cachePressedCurrentlyCount = 0;
-    private Keys[] cachePressedCurrently = new Keys[256];
+    private readonly Keys[] cachePressedCurrently = new Keys[256];
 
     private int cachePressedPreviouslyCount = 0;
-    private Keys[] cachePressedPreviously = new Keys[256];
+    private readonly Keys[] cachePressedPreviously = new Keys[256];
 
     public void RegisterOnPress(Keys key, Action<IKeyboardInputs, Keys> callback)
     {