diff --git a/src/Libraries/Microsoft.Extensions.AI.Abstractions/Utilities/AIJsonUtilities.cs b/src/Libraries/Microsoft.Extensions.AI.Abstractions/Utilities/AIJsonUtilities.cs
index 80daa0ed7bc..51459193923 100644
--- a/src/Libraries/Microsoft.Extensions.AI.Abstractions/Utilities/AIJsonUtilities.cs
+++ b/src/Libraries/Microsoft.Extensions.AI.Abstractions/Utilities/AIJsonUtilities.cs
@@ -90,7 +90,7 @@ public static string HashDataToString(ReadOnlySpan<object?> values, JsonSerializ
 
         // For cases where the hash may be used as a cache key, we rely on collision resistance for security purposes.
         // If a collision occurs, we'd serve a cached LLM response for a potentially unrelated prompt, leading to information
-        // disclosure. Use of SHA256 is an implementation detail and can be easily swapped in the future if needed, albeit
+        // disclosure. Use of SHA384 is an implementation detail and can be easily swapped in the future if needed, albeit
         // invalidating any existing cache entries.
 #if NET
         IncrementalHashStream? stream = IncrementalHashStream.ThreadStaticInstance;
@@ -107,7 +107,7 @@ public static string HashDataToString(ReadOnlySpan<object?> values, JsonSerializ
             stream = new();
         }
 
-        Span<byte> hashData = stackalloc byte[SHA256.HashSizeInBytes];
+        Span<byte> hashData = stackalloc byte[SHA384.HashSizeInBytes];
         try
         {
             foreach (object? value in values)
@@ -133,8 +133,8 @@ public static string HashDataToString(ReadOnlySpan<object?> values, JsonSerializ
             JsonSerializer.Serialize(stream, value, jti);
         }
 
-        using var sha256 = SHA256.Create();
-        var hashData = sha256.ComputeHash(stream.GetBuffer(), 0, (int)stream.Length);
+        using var hashAlgorithm = SHA384.Create();
+        var hashData = hashAlgorithm.ComputeHash(stream.GetBuffer(), 0, (int)stream.Length);
 
         return ConvertToHexString(hashData);
 
@@ -185,7 +185,7 @@ private sealed class IncrementalHashStream : Stream
         public static IncrementalHashStream? ThreadStaticInstance;
 
         /// <summary>The <see cref="IncrementalHash"/> used by this instance.</summary>
-        private readonly IncrementalHash _hash = IncrementalHash.CreateHash(HashAlgorithmName.SHA256);
+        private readonly IncrementalHash _hash = IncrementalHash.CreateHash(HashAlgorithmName.SHA384);
 
         /// <summary>Gets the current hash and resets.</summary>
         public void GetHashAndReset(Span<byte> bytes) => _hash.GetHashAndReset(bytes);