diff --git a/CHANGELOG.md b/CHANGELOG.md
index 054646e..29bd80a 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -5,6 +5,12 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## [0.5.4] - 2023-12-06
+
+### Added
+
+- Added support for netStandard2.0.
+
 ## [0.5.3] - 2023-11-16
 
 ### Added
diff --git a/src/lib/AccessRequest.cs b/src/lib/AccessRequest.cs
index d41cbb4..8b9b46d 100644
--- a/src/lib/AccessRequest.cs
+++ b/src/lib/AccessRequest.cs
@@ -21,7 +21,7 @@ internal static AccessRequest Load(JsonElement content)
     }
     public void Write(Utf8JsonWriter writer)
     {
-        ArgumentNullException.ThrowIfNull(writer);
+        ValidationHelpers.ThrowIfNull(writer, nameof(writer));
         writer.WriteStartObject();
         if (!String.IsNullOrWhiteSpace(Type)) writer.WriteString(TypeProperty, Type);
         if (Content != null)
diff --git a/src/lib/ApiDependency.cs b/src/lib/ApiDependency.cs
index ef50e05..5b71eb9 100644
--- a/src/lib/ApiDependency.cs
+++ b/src/lib/ApiDependency.cs
@@ -30,7 +30,7 @@ public string? ApiDeploymentBaseUrl
     // Write method
     public void Write(Utf8JsonWriter writer)
     {
-        ArgumentNullException.ThrowIfNull(writer);
+        ValidationHelpers.ThrowIfNull(writer, nameof(writer));
         writer.WriteStartObject();
 
         if (!string.IsNullOrWhiteSpace(ApiDescriptionUrl)) writer.WriteString(ApiDescriptionUrlProperty, ApiDescriptionUrl);
diff --git a/src/lib/ApiManifestDocument.cs b/src/lib/ApiManifestDocument.cs
index 3ea8d35..1a799d3 100644
--- a/src/lib/ApiManifestDocument.cs
+++ b/src/lib/ApiManifestDocument.cs
@@ -30,7 +30,7 @@ public ApiManifestDocument(JsonElement value)
     // Write method
     public void Write(Utf8JsonWriter writer)
     {
-        ArgumentNullException.ThrowIfNull(writer);
+        ValidationHelpers.ThrowIfNull(writer, nameof(writer));
         Validate();
         writer.WriteStartObject();
         writer.WriteString(ApplicationNameProperty, ApplicationName);
diff --git a/src/lib/AuthorizationRequirements.cs b/src/lib/AuthorizationRequirements.cs
index 9ee8aa3..3cecc4b 100644
--- a/src/lib/AuthorizationRequirements.cs
+++ b/src/lib/AuthorizationRequirements.cs
@@ -35,7 +35,7 @@ private static void LoadAccessProperty(AuthorizationRequirements o, JsonElement
     // Write Method
     public void Write(Utf8JsonWriter writer)
     {
-        ArgumentNullException.ThrowIfNull(writer);
+        ValidationHelpers.ThrowIfNull(writer, nameof(writer));
         writer.WriteStartObject();
 
         if (!string.IsNullOrWhiteSpace(ClientIdentifier)) writer.WriteString(ClientIdentifierProperty, ClientIdentifier);
diff --git a/src/lib/Extensions.cs b/src/lib/Extensions.cs
index ed59e94..a5f988e 100644
--- a/src/lib/Extensions.cs
+++ b/src/lib/Extensions.cs
@@ -1,6 +1,7 @@
 // Copyright (c) Microsoft Corporation. All rights reserved.
 // Licensed under the MIT license.
 
+using Microsoft.OpenApi.ApiManifest.Helpers;
 using System.Text.Json;
 using System.Text.Json.Nodes;
 
@@ -26,7 +27,7 @@ public static Extensions Load(JsonElement value)
 
     public void Write(Utf8JsonWriter writer)
     {
-        ArgumentNullException.ThrowIfNull(writer);
+        ValidationHelpers.ThrowIfNull(writer, nameof(writer));
         writer.WriteStartObject();
         foreach (var extension in this)
         {
diff --git a/src/lib/Helpers/ParsingHelpers.cs b/src/lib/Helpers/ParsingHelpers.cs
index 30232f8..3f3e1e4 100644
--- a/src/lib/Helpers/ParsingHelpers.cs
+++ b/src/lib/Helpers/ParsingHelpers.cs
@@ -3,7 +3,6 @@
 
 using Microsoft.OpenApi.Readers;
 using System.Diagnostics;
-using System.Net;
 using System.Text.Json;
 
 namespace Microsoft.OpenApi.ApiManifest.Helpers;
@@ -11,10 +10,8 @@ namespace Microsoft.OpenApi.ApiManifest.Helpers;
 internal static class ParsingHelpers
 {
     // The HttpClient will default to SslProtocol of none. This lets the OS pick an appropriate SSL protocol.
-    private static readonly Lazy<HttpClient> s_httpClient = new(() => new HttpClient())
-    {
-        Value = { DefaultRequestVersion = HttpVersion.Version20 }
-    };
+    private static readonly Lazy<HttpClient> s_httpClient = new(() => new HttpClient());
+
 
     internal static void ParseMap<T>(JsonElement node, T permissionsDocument, FixedFieldMap<T> handlers)
     {
@@ -68,7 +65,7 @@ internal static Dictionary<string, string> GetMapOfString(JsonElement v)
         foreach (var item in v.EnumerateObject())
         {
             var value = item.Value.GetString();
-            map.Add(item.Name, string.IsNullOrWhiteSpace(value) ? string.Empty : value);
+            map.Add(item.Name, string.IsNullOrWhiteSpace(value) ? string.Empty : value!);
         }
         return map;
     }
@@ -136,18 +133,18 @@ internal static IEnumerable<KeyValuePair<string, string>> ParseKey(string key)
             if (string.IsNullOrEmpty(pair))
                 continue;
 
-            var index = pair.IndexOf('=', StringComparison.OrdinalIgnoreCase);
+            var index = pair.IndexOf("=", StringComparison.OrdinalIgnoreCase);
             if (index == -1)
                 throw new InvalidOperationException($"Unable to parse: {key}. Format is name1=value1;name2=value2;...");
 
-            var keyValue = new KeyValuePair<string, string>(pair[..index], pair[(index + 1)..]);
+            var keyValue = new KeyValuePair<string, string>(pair.Substring(0, index), pair.Substring(index + 1));
             yield return keyValue;
         }
     }
 
     internal static async Task<ReadResult> ParseOpenApiAsync(Uri openApiFileUri, bool inlineExternal, CancellationToken cancellationToken)
     {
-        using var stream = await GetStreamAsync(openApiFileUri, cancellationToken: cancellationToken).ConfigureAwait(false);
+        using var stream = await GetStreamAsync(openApiFileUri).ConfigureAwait(false);
         return await ParseOpenApiAsync(stream, openApiFileUri, inlineExternal, cancellationToken).ConfigureAwait(false);
     }
 
@@ -163,13 +160,13 @@ internal static async Task<ReadResult> ParseOpenApiAsync(Stream stream, Uri open
         return result;
     }
 
-    internal static async Task<Stream> GetStreamAsync(Uri uri, CancellationToken cancellationToken = default)
+    internal static async Task<Stream> GetStreamAsync(Uri uri)
     {
         if (!uri.Scheme.StartsWith("http", StringComparison.OrdinalIgnoreCase))
             throw new ArgumentException($"The input {uri} is not a valid url", nameof(uri));
         try
         {
-            return await s_httpClient.Value.GetStreamAsync(uri, cancellationToken).ConfigureAwait(false);
+            return await s_httpClient.Value.GetStreamAsync(uri).ConfigureAwait(false);
         }
         catch (HttpRequestException ex)
         {
diff --git a/src/lib/Helpers/ValidationHelpers.cs b/src/lib/Helpers/ValidationHelpers.cs
index 5353d30..d7406fe 100644
--- a/src/lib/Helpers/ValidationHelpers.cs
+++ b/src/lib/Helpers/ValidationHelpers.cs
@@ -22,16 +22,22 @@ internal static void ValidateEmail(string parameterName, string? value, string p
             if (string.IsNullOrWhiteSpace(value))
                 throw new ArgumentNullException(parameterName, string.Format(CultureInfo.InvariantCulture, ErrorMessage.FieldIsRequired, parameterName, parentName));
             else
-                ValidateEmail(parameterName, value);
+                ValidateEmail(parameterName, value!);
         }
 
         internal static void ValidateBaseUrl(string parameterName, string? baseUrl)
         {
             // Check if the baseUrl is a valid URL and ends in a slash.
-            if (string.IsNullOrWhiteSpace(baseUrl) || !baseUrl.EndsWith("/", StringComparison.Ordinal) || !Uri.TryCreate(baseUrl, UriKind.Absolute, out _))
+            if (string.IsNullOrWhiteSpace(baseUrl) || !baseUrl!.EndsWith("/", StringComparison.Ordinal) || !Uri.TryCreate(baseUrl, UriKind.Absolute, out _))
                 throw new ArgumentException(string.Format(CultureInfo.InvariantCulture, ErrorMessage.BaseUrlIsNotValid, nameof(baseUrl)), parameterName);
         }
 
+        internal static void ThrowIfNull(object? obj, string? paramName = null)
+        {
+            if (obj == null)
+                throw new ArgumentNullException(paramName);
+        }
+
         private static readonly Regex s_emailRegex = new(@"^[^@\s]+@[^@\s]+$", RegexOptions.Compiled, Constants.DefaultRegexTimeout);
         private static void ValidateEmail(string parameterName, string value)
         {
diff --git a/src/lib/OpenAI/Api.cs b/src/lib/OpenAI/Api.cs
index 464d013..fa8a53e 100644
--- a/src/lib/OpenAI/Api.cs
+++ b/src/lib/OpenAI/Api.cs
@@ -46,7 +46,7 @@ public static Api Load(JsonElement value)
 
     public void Write(Utf8JsonWriter writer)
     {
-        ArgumentNullException.ThrowIfNull(writer);
+        ValidationHelpers.ThrowIfNull(writer, nameof(writer));
         Validate(this);
         writer.WriteStartObject();
         writer.WriteString(TypeProperty, Type);
diff --git a/src/lib/OpenAI/Authentication/BaseManifestAuth.cs b/src/lib/OpenAI/Authentication/BaseManifestAuth.cs
index f4ce82a..4f3390c 100644
--- a/src/lib/OpenAI/Authentication/BaseManifestAuth.cs
+++ b/src/lib/OpenAI/Authentication/BaseManifestAuth.cs
@@ -36,7 +36,7 @@ protected void LoadProperties(JsonElement value)
     /// <param name="writer">The <see cref="Utf8JsonWriter"/> to use.</param>
     protected void WriteProperties(Utf8JsonWriter writer)
     {
-        ArgumentNullException.ThrowIfNull(writer);
+        ValidationHelpers.ThrowIfNull(writer, nameof(writer));
         writer.WriteString(TypeProperty, Type);
         if (!string.IsNullOrWhiteSpace(Instructions)) writer.WriteString(InstructionsProperty, Instructions);
     }
diff --git a/src/lib/OpenAI/Authentication/ManifestNoAuth.cs b/src/lib/OpenAI/Authentication/ManifestNoAuth.cs
index 3a03d80..0a8e130 100644
--- a/src/lib/OpenAI/Authentication/ManifestNoAuth.cs
+++ b/src/lib/OpenAI/Authentication/ManifestNoAuth.cs
@@ -1,6 +1,7 @@
 // Copyright (c) Microsoft Corporation. All rights reserved.
 // Licensed under the MIT license.
 
+using Microsoft.OpenApi.ApiManifest.Helpers;
 using System.Text.Json;
 
 namespace Microsoft.OpenApi.ApiManifest.OpenAI.Authentication;
@@ -21,7 +22,7 @@ public static ManifestNoAuth Load(JsonElement value)
 
     public override void Write(Utf8JsonWriter writer)
     {
-        ArgumentNullException.ThrowIfNull(writer);
+        ValidationHelpers.ThrowIfNull(writer, nameof(writer));
         writer.WriteStartObject();
         WriteProperties(writer);
         writer.WriteEndObject();
diff --git a/src/lib/OpenAI/Authentication/ManifestOAuthAuth.cs b/src/lib/OpenAI/Authentication/ManifestOAuthAuth.cs
index fe13c4b..6fee91a 100644
--- a/src/lib/OpenAI/Authentication/ManifestOAuthAuth.cs
+++ b/src/lib/OpenAI/Authentication/ManifestOAuthAuth.cs
@@ -44,7 +44,7 @@ public static ManifestOAuthAuth Load(JsonElement value)
 
     public override void Write(Utf8JsonWriter writer)
     {
-        ArgumentNullException.ThrowIfNull(writer);
+        ValidationHelpers.ThrowIfNull(writer, nameof(writer));
         writer.WriteStartObject();
         WriteProperties(writer);
         if (!string.IsNullOrWhiteSpace(ClientUrl)) writer.WriteString(ClientUrlPropertyName, ClientUrl);
diff --git a/src/lib/OpenAI/Authentication/ManifestServiceHttpAuth.cs b/src/lib/OpenAI/Authentication/ManifestServiceHttpAuth.cs
index 6396421..15daef3 100644
--- a/src/lib/OpenAI/Authentication/ManifestServiceHttpAuth.cs
+++ b/src/lib/OpenAI/Authentication/ManifestServiceHttpAuth.cs
@@ -39,7 +39,7 @@ public static ManifestServiceHttpAuth Load(JsonElement value)
 
     public override void Write(Utf8JsonWriter writer)
     {
-        ArgumentNullException.ThrowIfNull(writer);
+        ValidationHelpers.ThrowIfNull(writer, nameof(writer));
         writer.WriteStartObject();
         WriteProperties(writer);
         writer.WriteString(AuthorizationTypeProperty, AuthorizationType);
diff --git a/src/lib/OpenAI/Authentication/ManifestUserHttpAuth.cs b/src/lib/OpenAI/Authentication/ManifestUserHttpAuth.cs
index 288f257..4e859b0 100644
--- a/src/lib/OpenAI/Authentication/ManifestUserHttpAuth.cs
+++ b/src/lib/OpenAI/Authentication/ManifestUserHttpAuth.cs
@@ -1,6 +1,7 @@
 // Copyright (c) Microsoft Corporation. All rights reserved.
 // Licensed under the MIT license.
 
+using Microsoft.OpenApi.ApiManifest.Helpers;
 using System.Text.Json;
 
 namespace Microsoft.OpenApi.ApiManifest.OpenAI.Authentication;
@@ -30,7 +31,7 @@ public static ManifestUserHttpAuth Load(JsonElement value)
 
     public override void Write(Utf8JsonWriter writer)
     {
-        ArgumentNullException.ThrowIfNull(writer);
+        ValidationHelpers.ThrowIfNull(writer, nameof(writer));
         writer.WriteStartObject();
         WriteProperties(writer);
         writer.WriteString(AuthorizationTypeProperty, AuthorizationType);
diff --git a/src/lib/OpenAI/Authentication/VerificationTokens.cs b/src/lib/OpenAI/Authentication/VerificationTokens.cs
index d03ed64..2355279 100644
--- a/src/lib/OpenAI/Authentication/VerificationTokens.cs
+++ b/src/lib/OpenAI/Authentication/VerificationTokens.cs
@@ -19,7 +19,7 @@ internal static VerificationTokens Load(JsonElement value)
 
     public void Write(Utf8JsonWriter writer)
     {
-        ArgumentNullException.ThrowIfNull(writer);
+        ValidationHelpers.ThrowIfNull(writer, nameof(writer));
         writer.WriteStartObject();
         foreach (var verificationToken in this)
         {
diff --git a/src/lib/OpenAI/OpenAIPluginManifest.cs b/src/lib/OpenAI/OpenAIPluginManifest.cs
index a73c2d8..64ff9ca 100644
--- a/src/lib/OpenAI/OpenAIPluginManifest.cs
+++ b/src/lib/OpenAI/OpenAIPluginManifest.cs
@@ -86,7 +86,7 @@ public static OpenAIPluginManifest Load(JsonElement value)
     //Write method
     public void Write(Utf8JsonWriter writer)
     {
-        ArgumentNullException.ThrowIfNull(writer);
+        ValidationHelpers.ThrowIfNull(writer, nameof(writer));
         Validate(this);
         writer.WriteStartObject();
         writer.WriteString(SchemaVersionProperty, SchemaVersion);
@@ -138,8 +138,8 @@ private void Validate(OpenAIPluginManifest openAIPluginManifest)
         ValidationHelpers.ValidateLength(nameof(DescriptionForModel), openAIPluginManifest.DescriptionForModel, 8000);
 
         ValidationHelpers.ValidateNullOrWhitespace(nameof(SchemaVersion), openAIPluginManifest.SchemaVersion, nameof(OpenAIPluginManifest));
-        ArgumentNullException.ThrowIfNull(openAIPluginManifest.Auth);
-        ArgumentNullException.ThrowIfNull(openAIPluginManifest.Api);
+        ValidationHelpers.ThrowIfNull(openAIPluginManifest.Auth, "Auth");
+        ValidationHelpers.ThrowIfNull(openAIPluginManifest.Api, "Api");
         ValidationHelpers.ValidateNullOrWhitespace(nameof(LogoUrl), openAIPluginManifest.LogoUrl, nameof(OpenAIPluginManifest));
         ValidationHelpers.ValidateEmail(nameof(ContactEmail), openAIPluginManifest.ContactEmail, nameof(OpenAIPluginManifest));
         ValidationHelpers.ValidateNullOrWhitespace(nameof(LegalInfoUrl), openAIPluginManifest.LegalInfoUrl, nameof(OpenAIPluginManifest));
diff --git a/src/lib/Publisher.cs b/src/lib/Publisher.cs
index 125dcf5..697c6f2 100644
--- a/src/lib/Publisher.cs
+++ b/src/lib/Publisher.cs
@@ -26,7 +26,7 @@ private Publisher(JsonElement value)
     // Write method
     public void Write(Utf8JsonWriter writer)
     {
-        ArgumentNullException.ThrowIfNull(writer);
+        ValidationHelpers.ThrowIfNull(writer, nameof(writer));
         Validate();
         writer.WriteStartObject();
         writer.WriteString(NameProperty, Name);
diff --git a/src/lib/RequestInfo.cs b/src/lib/RequestInfo.cs
index 3bc2aac..17ea735 100644
--- a/src/lib/RequestInfo.cs
+++ b/src/lib/RequestInfo.cs
@@ -17,7 +17,7 @@ public class RequestInfo
     // Write method
     public void Write(Utf8JsonWriter writer)
     {
-        ArgumentNullException.ThrowIfNull(writer);
+        ValidationHelpers.ThrowIfNull(writer, nameof(writer));
         writer.WriteStartObject();
 
         if (!String.IsNullOrWhiteSpace(Method)) writer.WriteString(MethodProperty, Method);
diff --git a/src/lib/TypeExtensions/ApiManifestDocumentExtensions.cs b/src/lib/TypeExtensions/ApiManifestDocumentExtensions.cs
index af0efe3..d08b03e 100644
--- a/src/lib/TypeExtensions/ApiManifestDocumentExtensions.cs
+++ b/src/lib/TypeExtensions/ApiManifestDocumentExtensions.cs
@@ -21,7 +21,7 @@ public static class ApiManifestDocumentExtensions
         /// <returns>A <see cref="Task{OpenAIPluginManifest}"/></returns>
         public static async Task<OpenAIPluginManifest> ToOpenAIPluginManifestAsync(this ApiManifestDocument apiManifestDocument, string logoUrl, string legalInfoUrl, string? apiDependencyName = default, string? openApiPath = default, CancellationToken cancellationToken = default)
         {
-            ArgumentNullException.ThrowIfNull(apiManifestDocument);
+            ValidationHelpers.ThrowIfNull(apiManifestDocument, nameof(apiManifestDocument));
             if (!TryGetApiDependency(apiManifestDocument.ApiDependencies, apiDependencyName, out ApiDependency? apiDependency))
             {
                 throw new ApiManifestException(string.Format(CultureInfo.InvariantCulture, ErrorMessage.ApiDependencyNotFound, nameof(OpenAIPluginManifest)));
@@ -32,8 +32,10 @@ public static async Task<OpenAIPluginManifest> ToOpenAIPluginManifestAsync(this
             }
             else
             {
-                var result = await ParsingHelpers.ParseOpenApiAsync(new Uri(apiDependency.ApiDescriptionUrl), false, cancellationToken).ConfigureAwait(false);
-                return apiManifestDocument.ToOpenAIPluginManifest(result.OpenApiDocument, logoUrl, legalInfoUrl, openApiPath ?? apiDependency.ApiDescriptionUrl);
+                var result = await ParsingHelpers.ParseOpenApiAsync(new Uri(apiDependency!.ApiDescriptionUrl), false, cancellationToken).ConfigureAwait(false);
+                if (string.IsNullOrWhiteSpace(openApiPath))
+                    openApiPath = apiDependency.ApiDescriptionUrl;
+                return apiManifestDocument.ToOpenAIPluginManifest(result.OpenApiDocument, logoUrl, legalInfoUrl, openApiPath!);
             }
         }
 
@@ -48,8 +50,8 @@ public static async Task<OpenAIPluginManifest> ToOpenAIPluginManifestAsync(this
         /// <returns>A <see cref="OpenAIPluginManifest"/></returns>
         public static OpenAIPluginManifest ToOpenAIPluginManifest(this ApiManifestDocument apiManifestDocument, OpenApiDocument openApiDocument, string logoUrl, string legalInfoUrl, string openApiPath)
         {
-            ArgumentNullException.ThrowIfNull(apiManifestDocument);
-            ArgumentNullException.ThrowIfNull(openApiDocument);
+            ValidationHelpers.ThrowIfNull(apiManifestDocument, nameof(apiManifestDocument));
+            ValidationHelpers.ThrowIfNull(openApiDocument, nameof(openApiDocument));
             // Validates the ApiManifestDocument before generating the OpenAI manifest. This includes the publisher object.
             apiManifestDocument.Validate();
             string contactEmail = apiManifestDocument.Publisher?.ContactEmail!;
@@ -75,7 +77,7 @@ private static bool TryGetApiDependency(ApiDependencies apiDependencies, string?
             if (string.IsNullOrEmpty(apiDependencyName))
                 apiDependency = apiDependencies.FirstOrDefault().Value;
             else
-                _ = apiDependencies.TryGetValue(apiDependencyName, out apiDependency);
+                _ = apiDependencies.TryGetValue(apiDependencyName!, out apiDependency);
             return apiDependency != null;
         }
     }
diff --git a/src/lib/TypeExtensions/OpenApiDocumentExtensions.cs b/src/lib/TypeExtensions/OpenApiDocumentExtensions.cs
index e817ff7..bb070af 100644
--- a/src/lib/TypeExtensions/OpenApiDocumentExtensions.cs
+++ b/src/lib/TypeExtensions/OpenApiDocumentExtensions.cs
@@ -9,8 +9,7 @@ namespace Microsoft.OpenApi.ApiManifest.TypeExtensions
 {
     public static partial class OpenApiDocumentExtensions
     {
-        [GeneratedRegex("[^a-zA-Z0-9]", RegexOptions.Compiled, 5000)]
-        private static partial Regex SpecialCharactersInApiNameRegex();
+        private static readonly Regex s_specialCharactersInApiNameRegex = new("[^a-zA-Z0-9]", RegexOptions.Compiled, TimeSpan.FromSeconds(5));
         internal const string DefaultPublisherName = "publisher-name";
         internal const string DefaultPublisherEmail = "publisher-email@example.com";
 
@@ -34,7 +33,7 @@ public static partial class OpenApiDocumentExtensions
         /// <returns>An <see cref="ApiManifestDocument"/>.</returns>
         public static ApiManifestDocument ToApiManifest(this OpenApiDocument document, string? apiDescriptionUrl, string applicationName, string? apiDependencyName = default, string? publisherName = default, string? publisherEmail = default)
         {
-            ArgumentNullException.ThrowIfNull(document);
+            ValidationHelpers.ThrowIfNull(document, nameof(document));
             ValidationHelpers.ValidateNullOrWhitespace(nameof(apiDescriptionUrl), apiDescriptionUrl, nameof(ApiManifestDocument));
             ValidationHelpers.ValidateNullOrWhitespace(nameof(applicationName), applicationName, nameof(ApiManifestDocument));
 
@@ -44,18 +43,18 @@ public static ApiManifestDocument ToApiManifest(this OpenApiDocument document, s
             if (string.IsNullOrEmpty(publisherEmail))
                 publisherEmail = document.Info.Contact?.Email is string cEmail && !string.IsNullOrEmpty(cEmail) ? cEmail : DefaultPublisherEmail;
 
-            apiDependencyName = NormalizeApiName(string.IsNullOrEmpty(apiDependencyName) ? document.Info.Title : apiDependencyName);
+            apiDependencyName = NormalizeApiName(string.IsNullOrEmpty(apiDependencyName) ? document.Info.Title : apiDependencyName!);
             string? apiDeploymentBaseUrl = GetApiDeploymentBaseUrl(document.Servers.FirstOrDefault());
 
             var apiManifest = new ApiManifestDocument(applicationName)
             {
-                Publisher = new(publisherName, publisherEmail),
+                Publisher = new(publisherName!, publisherEmail!),
                 ApiDependencies = new() {
                     {
                         apiDependencyName, new() {
                             ApiDescriptionUrl = apiDescriptionUrl,
                             ApiDescriptionVersion = document.Info.Version,
-                            ApiDeploymentBaseUrl = apiDeploymentBaseUrl,
+                            ApiDeploymentBaseUrl = apiDeploymentBaseUrl
                         }
                     }
                 }
@@ -79,7 +78,7 @@ public static ApiManifestDocument ToApiManifest(this OpenApiDocument document, s
         private static string NormalizeApiName(string apiName)
         {
             // Normalize OpenAPI document title to API dependency name by removing all special characters from the provided api name.
-            return SpecialCharactersInApiNameRegex().Replace(apiName, string.Empty);
+            return s_specialCharactersInApiNameRegex.Replace(apiName, string.Empty);
         }
 
         private static string? GetApiDeploymentBaseUrl(OpenApiServer? server)
diff --git a/src/lib/apimanifest.csproj b/src/lib/apimanifest.csproj
index 6f3238e..cf8b971 100644
--- a/src/lib/apimanifest.csproj
+++ b/src/lib/apimanifest.csproj
@@ -1,9 +1,9 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-    <TargetFramework>net7.0</TargetFramework>
+    <TargetFramework>netstandard2.0</TargetFramework>
     <PackageId>Microsoft.OpenApi.ApiManifest</PackageId>
-    <VersionPrefix>0.5.3</VersionPrefix>
+    <VersionPrefix>0.5.4</VersionPrefix>
     <VersionSuffix>preview</VersionSuffix>
     <PackageIconUrl>http://go.microsoft.com/fwlink/?LinkID=288890</PackageIconUrl>
     <PackageProjectUrl>https://github.com/Microsoft/OpenApi.ApiManifest</PackageProjectUrl>
@@ -13,6 +13,7 @@
     <Company>Microsoft</Company>
     <Copyright>© Microsoft Corporation. All rights reserved.</Copyright>
     <PackageOutputPath>./../../artifacts</PackageOutputPath>
+    <LangVersion>10</LangVersion>
     <ImplicitUsings>enable</ImplicitUsings>
     <Nullable>enable</Nullable>
     <SignAssembly>True</SignAssembly>
@@ -30,6 +31,7 @@
 
   <ItemGroup>
     <PackageReference Include="Microsoft.OpenApi.Readers" Version="1.6.11" />
+    <PackageReference Include="System.Text.Json" Version="[6.0,9.0)" />
   </ItemGroup>
 
-</Project>
\ No newline at end of file
+</Project>