diff --git a/src/FluentHttpClient.Tests/FluentJsonContentExtensionsAotTests.cs b/src/FluentHttpClient.Tests/FluentJsonContentExtensionsAotTests.cs
index bb4101d..d10626f 100644
--- a/src/FluentHttpClient.Tests/FluentJsonContentExtensionsAotTests.cs
+++ b/src/FluentHttpClient.Tests/FluentJsonContentExtensionsAotTests.cs
@@ -2,10 +2,6 @@
 using System.Net.Http.Headers;
 using System.Text;
 using System.Text.Json;
-using System.Text.Json.Serialization;
-using FluentHttpClient;
-using Shouldly;
-using Xunit;
 
 namespace FluentHttpClient.Tests;
 
diff --git a/src/FluentHttpClient.Tests/FluentSendExtensionsTests.cs b/src/FluentHttpClient.Tests/FluentSendExtensionsTests.cs
index 0459d0f..6cdf9f7 100644
--- a/src/FluentHttpClient.Tests/FluentSendExtensionsTests.cs
+++ b/src/FluentHttpClient.Tests/FluentSendExtensionsTests.cs
@@ -1,9 +1,4 @@
 using System.Net;
-using System.Net.Http;
-using System.Threading;
-using System.Threading.Tasks;
-using Shouldly;
-using Xunit;
 
 namespace FluentHttpClient.Tests;
 
diff --git a/src/FluentHttpClient/FluentJsonSerializer.cs b/src/FluentHttpClient/FluentJsonSerializer.cs
index 963d14e..0778d1c 100644
--- a/src/FluentHttpClient/FluentJsonSerializer.cs
+++ b/src/FluentHttpClient/FluentJsonSerializer.cs
@@ -1,6 +1,8 @@
 using System.Diagnostics.CodeAnalysis;
 using System.Text.Json;
+#if NETSTANDARD2_1_OR_GREATER
 using System.Text.Json.Serialization;
+#endif
 
 namespace FluentHttpClient;