diff --git a/src/JWT/Builder/JwtBuilder.cs b/src/JWT/Builder/JwtBuilder.cs
index dc6a55033..31cecbdfb 100644
--- a/src/JWT/Builder/JwtBuilder.cs
+++ b/src/JWT/Builder/JwtBuilder.cs
@@ -4,6 +4,7 @@
 using JWT.Serializers;
 
 using static JWT.Internal.EncodingHelper;
+using static JWT.Serializers.JsonSerializerFactory;
 
 namespace JWT.Builder
 {
diff --git a/src/JWT/Properties/AssemblyInfo.cs b/src/JWT/Properties/AssemblyInfo.cs
index 369a697ae..5d13524ab 100644
--- a/src/JWT/Properties/AssemblyInfo.cs
+++ b/src/JWT/Properties/AssemblyInfo.cs
@@ -2,7 +2,6 @@
 using JWT;
 
 [assembly: InternalsVisibleTo("JWT.Tests.Common, PublicKey=" + AssemblyInfo.PublicKey)]
-[assembly: InternalsVisibleTo("JWT.Tests.NetCore2, PublicKey=" + AssemblyInfo.PublicKey)]
 [assembly: InternalsVisibleTo("JWT.Tests.NetCore3, PublicKey=" + AssemblyInfo.PublicKey)]
 [assembly: InternalsVisibleTo("JWT.Tests.Net35, PublicKey=" + AssemblyInfo.PublicKey)]
 [assembly: InternalsVisibleTo("JWT.Tests.Net40, PublicKey=" + AssemblyInfo.PublicKey)]
diff --git a/tests/JWT.Tests.Common/Serializers/JsonSerializerFactory.cs b/src/JWT/Serializers/JsonSerializerFactory.cs
similarity index 70%
rename from tests/JWT.Tests.Common/Serializers/JsonSerializerFactory.cs
rename to src/JWT/Serializers/JsonSerializerFactory.cs
index 3a30ebfc5..884861603 100644
--- a/tests/JWT.Tests.Common/Serializers/JsonSerializerFactory.cs
+++ b/src/JWT/Serializers/JsonSerializerFactory.cs
@@ -1,6 +1,4 @@
-using JWT.Serializers;
-
-namespace JWT.Tests.Serializers
+namespace JWT.Serializers
 {
     internal static class JsonSerializerFactory
     {
@@ -11,7 +9,7 @@ public static IJsonSerializer CreateSerializer()
 #elif NEWTONSOFT_JSON
             return new JsonNetSerializer();
 #else
-            throw new NotSupportedException();
+            throw new System.NotSupportedException();
 #endif
         }
     }
diff --git a/tests/JWT.Extensions.AspNetCore.Tests/JwtAuthenticationHandlerTests.cs b/tests/JWT.Extensions.AspNetCore.Tests/JwtAuthenticationHandlerTests.cs
index 186b7d209..068b75252 100644
--- a/tests/JWT.Extensions.AspNetCore.Tests/JwtAuthenticationHandlerTests.cs
+++ b/tests/JWT.Extensions.AspNetCore.Tests/JwtAuthenticationHandlerTests.cs
@@ -13,7 +13,7 @@
 using Microsoft.VisualStudio.TestTools.UnitTesting;
 using Moq;
 
-using static JWT.Tests.Serializers.JsonSerealizerFactory;
+using static JWT.Serializers.JsonSerializerFactory;
 
 namespace JWT.Extensions.AspNetCore.Tests
 {
diff --git a/tests/JWT.Tests.Common/JwtDecoderTests.cs b/tests/JWT.Tests.Common/JwtDecoderTests.cs
index 8d175f4cc..26a69b8a4 100644
--- a/tests/JWT.Tests.Common/JwtDecoderTests.cs
+++ b/tests/JWT.Tests.Common/JwtDecoderTests.cs
@@ -5,11 +5,12 @@
 using JWT.Algorithms;
 using JWT.Builder;
 using JWT.Exceptions;
-using JWT.Serializers;
 using JWT.Tests.Models;
 using Microsoft.VisualStudio.TestTools.UnitTesting;
 using Moq;
 
+using static JWT.Serializers.JsonSerializerFactory;
+
 namespace JWT.Tests
 {
     [TestClass]
@@ -547,16 +548,5 @@ public void DecodeToObject_Should_Throw_Exception_On_Null_NotBefore_Claim()
                   .Throw<SignatureVerificationException>()
                   .WithMessage("Claim 'nbf' must be a number.", "because the invalid 'nbf' must result in an exception on decoding");
         }
-
-        private static IJsonSerializer CreateSerializer()
-        {
-#if SYSTEM_TEXT_JSON
-            return new SystemTextSerializer();
-#elif NEWTONSOFT_JSON
-            return new JsonNetSerializer();
-#else
-            throw new NotSupportedException();
-#endif
-        }
     }
 }
\ No newline at end of file
diff --git a/tests/JWT.Tests.Common/JwtEncoderTests.cs b/tests/JWT.Tests.Common/JwtEncoderTests.cs
index 3c60fed42..a3ee9d892 100644
--- a/tests/JWT.Tests.Common/JwtEncoderTests.cs
+++ b/tests/JWT.Tests.Common/JwtEncoderTests.cs
@@ -1,10 +1,11 @@
 using System.Collections.Generic;
 using FluentAssertions;
 using JWT.Algorithms;
-using JWT.Serializers;
 using JWT.Tests.Models;
 using Microsoft.VisualStudio.TestTools.UnitTesting;
 
+using static JWT.Serializers.JsonSerializerFactory;
+
 namespace JWT.Tests
 {
     [TestClass]
@@ -89,16 +90,5 @@ public void Encode_With_NoAlgorithm_Should_Encode_To_Token()
             actual.Should()
                   .Be(expected, "because the same data encoded with the same key must result in the same token");
         }
-
-        private static IJsonSerializer CreateSerializer()
-        {
-#if SYSTEM_TEXT_JSON
-            return new SystemTextSerializer();
-#elif NEWTONSOFT_JSON
-            return new JsonNetSerializer();
-#else
-            throw new NotSupportedException();
-#endif
-        }
     }
 }
\ No newline at end of file
diff --git a/tests/JWT.Tests.Common/JwtSecurityTests.cs b/tests/JWT.Tests.Common/JwtSecurityTests.cs
index d8e446f7f..e793ba5d9 100644
--- a/tests/JWT.Tests.Common/JwtSecurityTests.cs
+++ b/tests/JWT.Tests.Common/JwtSecurityTests.cs
@@ -3,10 +3,11 @@
 using AutoFixture;
 using FluentAssertions;
 using JWT.Algorithms;
-using JWT.Serializers;
 using JWT.Tests.Models;
 using Microsoft.VisualStudio.TestTools.UnitTesting;
 
+using static JWT.Serializers.JsonSerializerFactory;
+
 namespace JWT.Tests
 {
     [TestClass]
@@ -96,16 +97,5 @@ public void Decode_Should_Throw_Exception_When_Jwt_Contains_HMA_Algorithm_But_RS
             action.Should()
                   .Throw<NotSupportedException>("because an encryption algorithm can't be changed on decoding");
         }
-
-        private static IJsonSerializer CreateSerializer()
-        {
-#if SYSTEM_TEXT_JSON
-            return new SystemTextSerializer();
-#elif NEWTONSOFT_JSON
-            return new JsonNetSerializer();
-#else
-            throw new NotSupportedException();
-#endif
-        }
     }
 }
\ No newline at end of file
diff --git a/tests/JWT.Tests.Common/JwtValidatorTests.cs b/tests/JWT.Tests.Common/JwtValidatorTests.cs
index bd407f808..48843fb84 100644
--- a/tests/JWT.Tests.Common/JwtValidatorTests.cs
+++ b/tests/JWT.Tests.Common/JwtValidatorTests.cs
@@ -2,11 +2,12 @@
 using FluentAssertions;
 using JWT.Algorithms;
 using JWT.Exceptions;
-using JWT.Serializers;
 using JWT.Tests.Models;
 using JWT.Tests.Stubs;
 using Microsoft.VisualStudio.TestTools.UnitTesting;
+
 using static JWT.Internal.EncodingHelper;
+using static JWT.Serializers.JsonSerializerFactory;
 
 namespace JWT.Tests
 {
diff --git a/tests/JWT.Tests.Net60/JWT.Tests.Net60.csproj b/tests/JWT.Tests.Net60/JWT.Tests.Net60.csproj
index c966f71d6..13a301612 100644
--- a/tests/JWT.Tests.Net60/JWT.Tests.Net60.csproj
+++ b/tests/JWT.Tests.Net60/JWT.Tests.Net60.csproj
@@ -2,7 +2,6 @@
 
   <PropertyGroup>
     <TargetFramework>net6.0</TargetFramework>
-    <TargetFrameworkIdentifier>.NETFramework,Version=6.0</TargetFrameworkIdentifier>
   </PropertyGroup>
 
   <ItemGroup>