diff --git a/JsonSubTypes.Tests.Net35/JsonSubTypes.Tests.Net35.csproj b/JsonSubTypes.Tests.Net35/JsonSubTypes.Tests.Net35.csproj
index 298fb01..2adacba 100644
--- a/JsonSubTypes.Tests.Net35/JsonSubTypes.Tests.Net35.csproj
+++ b/JsonSubTypes.Tests.Net35/JsonSubTypes.Tests.Net35.csproj
@@ -16,7 +16,7 @@
   </PropertyGroup>
   <ItemGroup>
     <PackageReference Include="Newtonsoft.Json" Version="13.0.4" />
-    <PackageReference Include="NUnit" Version="3.14.0" />
+    <PackageReference Include="NUnit" Version="4.6.1" />
     <PackageReference Include="NUnit3TestAdapter" Version="6.3.0" />
     <PackageReference Include="TaskParallelLibrary" Version="1.0.2856.0" />
   </ItemGroup>
diff --git a/JsonSubTypes.Tests/JsonSubTypes.Tests.csproj b/JsonSubTypes.Tests/JsonSubTypes.Tests.csproj
index 02aee15..c303760 100644
--- a/JsonSubTypes.Tests/JsonSubTypes.Tests.csproj
+++ b/JsonSubTypes.Tests/JsonSubTypes.Tests.csproj
@@ -17,7 +17,7 @@
   <Import Project="$(VSToolsPath)\TeamTest\Microsoft.TestTools.targets" Condition="Exists('$(VSToolsPath)\TeamTest\Microsoft.TestTools.targets')" />
   <ItemGroup>
     <PackageReference Include="Newtonsoft.Json" Version="13.0.4" />
-    <PackageReference Include="NUnit" Version="3.14.0" />
+    <PackageReference Include="NUnit" Version="4.6.1" />
     <PackageReference Include="NUnit3TestAdapter" Version="6.3.0" />
   </ItemGroup>
   <ItemGroup Condition="'$(TargetFramework)'=='net8.0' Or '$(TargetFramework)'=='net10.0'">
diff --git a/JsonSubTypes.Text.Json.Aot.Generator.Tests/JsonSubTypes.Text.Json.Aot.Generator.Tests.csproj b/JsonSubTypes.Text.Json.Aot.Generator.Tests/JsonSubTypes.Text.Json.Aot.Generator.Tests.csproj
index cb396d7..62c60c0 100644
--- a/JsonSubTypes.Text.Json.Aot.Generator.Tests/JsonSubTypes.Text.Json.Aot.Generator.Tests.csproj
+++ b/JsonSubTypes.Text.Json.Aot.Generator.Tests/JsonSubTypes.Text.Json.Aot.Generator.Tests.csproj
@@ -8,7 +8,7 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="nunit" Version="3.13.3" />
+    <PackageReference Include="nunit" Version="4.6.1" />
     <PackageReference Include="NUnit3TestAdapter" Version="6.3.0" />
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="18.8.1" />
     <PackageReference Include="coverlet.collector" Version="10.0.1">
diff --git a/JsonSubTypes.Text.Json.Aot.Tests/JsonSubTypes.Text.Json.Aot.Tests.csproj b/JsonSubTypes.Text.Json.Aot.Tests/JsonSubTypes.Text.Json.Aot.Tests.csproj
index c102a23..1505075 100644
--- a/JsonSubTypes.Text.Json.Aot.Tests/JsonSubTypes.Text.Json.Aot.Tests.csproj
+++ b/JsonSubTypes.Text.Json.Aot.Tests/JsonSubTypes.Text.Json.Aot.Tests.csproj
@@ -7,7 +7,7 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="nunit" Version="3.13.3" />
+    <PackageReference Include="nunit" Version="4.6.1" />
     <PackageReference Include="NUnit3TestAdapter" Version="6.3.0" />
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="18.8.1" />
     <PackageReference Include="coverlet.collector" Version="10.0.1">
diff --git a/JsonSubTypes.Text.Json.Tests/JsonSubTypes.Text.Json.Tests.csproj b/JsonSubTypes.Text.Json.Tests/JsonSubTypes.Text.Json.Tests.csproj
index b2b3b46..cdcfea3 100644
--- a/JsonSubTypes.Text.Json.Tests/JsonSubTypes.Text.Json.Tests.csproj
+++ b/JsonSubTypes.Text.Json.Tests/JsonSubTypes.Text.Json.Tests.csproj
@@ -6,7 +6,7 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="nunit" Version="3.13.3" />
+    <PackageReference Include="nunit" Version="4.6.1" />
     <PackageReference Include="NUnit3TestAdapter" Version="6.3.0" />
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="18.8.1" />
     <PackageReference Include="coverlet.collector" Version="10.0.1">