diff --git a/src/Microsoft.OpenApi.Hidi/Microsoft.OpenApi.Hidi.csproj b/src/Microsoft.OpenApi.Hidi/Microsoft.OpenApi.Hidi.csproj
index 4c659736d..f060053b3 100644
--- a/src/Microsoft.OpenApi.Hidi/Microsoft.OpenApi.Hidi.csproj
+++ b/src/Microsoft.OpenApi.Hidi/Microsoft.OpenApi.Hidi.csproj
@@ -33,7 +33,7 @@
     <PackageReference Include="Microsoft.Extensions.Logging.Abstractions" Version="10.0.9" />
     <PackageReference Include="Microsoft.Extensions.Logging.Console" Version="10.0.9" />
     <PackageReference Include="Microsoft.Extensions.Logging.Debug" Version="10.0.9" />
-    <PackageReference Include="Microsoft.VisualStudio.Threading.Analyzers" Version="17.14.15">
+    <PackageReference Include="Microsoft.VisualStudio.Threading.Analyzers" Version="18.7.23">
       <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
       <PrivateAssets>all</PrivateAssets>
     </PackageReference>
diff --git a/src/Microsoft.OpenApi.YamlReader/Microsoft.OpenApi.YamlReader.csproj b/src/Microsoft.OpenApi.YamlReader/Microsoft.OpenApi.YamlReader.csproj
index c4961cb10..335b8ca90 100644
--- a/src/Microsoft.OpenApi.YamlReader/Microsoft.OpenApi.YamlReader.csproj
+++ b/src/Microsoft.OpenApi.YamlReader/Microsoft.OpenApi.YamlReader.csproj
@@ -33,7 +33,7 @@
           <PrivateAssets>all</PrivateAssets>
         </PackageReference>
 
-        <PackageReference Include="Microsoft.VisualStudio.Threading.Analyzers" Version="17.14.15">
+        <PackageReference Include="Microsoft.VisualStudio.Threading.Analyzers" Version="18.7.23">
           <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
           <PrivateAssets>all</PrivateAssets>
         </PackageReference>
diff --git a/src/Microsoft.OpenApi/Microsoft.OpenApi.csproj b/src/Microsoft.OpenApi/Microsoft.OpenApi.csproj
index a6ea923a6..507f69e76 100644
--- a/src/Microsoft.OpenApi/Microsoft.OpenApi.csproj
+++ b/src/Microsoft.OpenApi/Microsoft.OpenApi.csproj
@@ -54,7 +54,7 @@
     </ItemGroup>
 
     <ItemGroup>
-      <PackageReference Include="Microsoft.VisualStudio.Threading.Analyzers" Version="17.14.15">
+      <PackageReference Include="Microsoft.VisualStudio.Threading.Analyzers" Version="18.7.23">
         <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
         <PrivateAssets>all</PrivateAssets>
       </PackageReference>
diff --git a/src/Microsoft.OpenApi/Models/OpenApiDocument.cs b/src/Microsoft.OpenApi/Models/OpenApiDocument.cs
index 96973a701..dc1c58bae 100644
--- a/src/Microsoft.OpenApi/Models/OpenApiDocument.cs
+++ b/src/Microsoft.OpenApi/Models/OpenApiDocument.cs
@@ -566,25 +566,20 @@ public void SetReferenceHostDocument()
         /// <returns>The hash value.</returns>
         public async Task<string> GetHashCodeAsync(CancellationToken cancellationToken = default)
         {
-#if NET7_OR_GREATER
             using var memoryStream = new MemoryStream();
             using var streamWriter = new StreamWriter(memoryStream);
 
             await WriteDocumentAsync(streamWriter, cancellationToken).ConfigureAwait(false);
 
+#if NET7_OR_GREATER
             memoryStream.Seek(0, SeekOrigin.Begin);
 
             var hash = await SHA512.HashDataAsync(memoryStream, cancellationToken).ConfigureAwait(false);
 #else
             using HashAlgorithm sha = SHA512.Create();
-            using var cryptoStream = new CryptoStream(Stream.Null, sha, CryptoStreamMode.Write);
-            using var streamWriter = new StreamWriter(cryptoStream);
-
-            await WriteDocumentAsync(streamWriter, cancellationToken).ConfigureAwait(false);
-
-            cryptoStream.FlushFinalBlock();
-
-            var hash = sha.Hash;
+            var hash = memoryStream.TryGetBuffer(out ArraySegment<byte> buffer) && buffer.Array is byte[] array
+                ? sha.ComputeHash(array, buffer.Offset, buffer.Count)
+                : sha.ComputeHash(memoryStream.ToArray());
 #endif
 
             return ConvertByteArrayToString(hash ?? []);