diff --git a/Src/Fido2.Ctap2/Commands/CtapCommand.cs b/Src/Fido2.Ctap2/Commands/CtapCommand.cs
index 9eada65a..f112c645 100644
--- a/Src/Fido2.Ctap2/Commands/CtapCommand.cs
+++ b/Src/Fido2.Ctap2/Commands/CtapCommand.cs
@@ -14,7 +14,7 @@ public byte[] GetPayload()
 
         if (parameters is null)
         {
-            return new byte[] { (byte)Type };
+            return [(byte)Type];
         }
 
         var encodedObject = parameters.Encode();
diff --git a/Src/Fido2.Ctap2/Helpers/CryptoHelper.cs b/Src/Fido2.Ctap2/Helpers/CryptoHelper.cs
index 64c10f3d..cf600d8c 100644
--- a/Src/Fido2.Ctap2/Helpers/CryptoHelper.cs
+++ b/Src/Fido2.Ctap2/Helpers/CryptoHelper.cs
@@ -6,7 +6,7 @@ namespace Fido2NetLib.Ctap2;
 
 public static class CryptoHelper
 {
-    internal static readonly byte[] DefaultIV = { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 };
+    internal static ReadOnlySpan<byte> DefaultIV => [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0];
 
     internal static byte[] AesCbcDefaultIvNoPadding(byte[] key, ReadOnlySpan<byte> data)
     {