diff --git a/tests/Formatting/NSecTests.cs b/tests/Formatting/NSecTests.cs
index e8fff51a..4b26a513 100644
--- a/tests/Formatting/NSecTests.cs
+++ b/tests/Formatting/NSecTests.cs
@@ -87,7 +87,7 @@ private static void Test(Algorithm a, int seedSize, KeyBlobFormat importFormat,
 
             Assert.NotNull(blob);
             Assert.Equal(blobHeader.Length + sizeof(short) + sizeof(short) + keySize, blob.Length);
-            Assert.Equal(blobHeader, blob.AsSpan(0, blobHeader.Length).ToArray());
+            Assert.Equal(blobHeader, blob[..blobHeader.Length]);
             Assert.Equal(keySize, BitConverter.ToInt16(blob, blobHeader.Length));
             Assert.Equal(outputSize, BitConverter.ToInt16(blob, blobHeader.Length + sizeof(short)));
 
@@ -118,7 +118,7 @@ public static void TestSharedSecret()
 
             Assert.NotNull(blob);
             Assert.Equal(blobHeader.Length + sizeof(short) + sizeof(short) + b.Length, blob.Length);
-            Assert.Equal(blobHeader, blob.AsSpan(0, blobHeader.Length).ToArray());
+            Assert.Equal(blobHeader, blob[..blobHeader.Length]);
             Assert.Equal(b.Length, BitConverter.ToInt16(blob, blobHeader.Length));
             Assert.Equal(0, BitConverter.ToInt16(blob, blobHeader.Length + sizeof(short)));
 
diff --git a/tests/Other/Iso78164PaddingTests.cs b/tests/Other/Iso78164PaddingTests.cs
index 28edc1c7..321f3cfa 100644
--- a/tests/Other/Iso78164PaddingTests.cs
+++ b/tests/Other/Iso78164PaddingTests.cs
@@ -70,7 +70,7 @@ public static void DecodeCorruptedPadding(int blockSize, byte[] padded, byte[] u
         {
             for (var i = unpadded.Length; i < padded.Length; i++)
             {
-                var corrupted = padded.AsSpan().ToArray();
+                var corrupted = padded[..];
                 corrupted[i] = 0xFF;
                 Assert.Null(Iso78164Padding.Unpad(corrupted, blockSize));
                 Assert.False(Iso78164Padding.Unpad(corrupted, blockSize, out var actual));
@@ -84,7 +84,7 @@ public static void DecodeInvalidLength(int blockSize, byte[] padded, byte[] unpa
         {
             for (var i = 1; i < blockSize; i++)
             {
-                var corrupted = padded.AsSpan(0, padded.Length - i).ToArray();
+                var corrupted = padded[..^i];
                 Assert.Null(Iso78164Padding.Unpad(corrupted, blockSize));
                 Assert.False(Iso78164Padding.Unpad(corrupted, blockSize, out var actual));
                 Assert.True(actual.IsEmpty);