diff --git a/tests/Invisionware.Serialization.JsonNet.Tests/Invisionware.Serialization.JsonNet.Tests.csproj b/tests/Invisionware.Serialization.JsonNet.Tests/Invisionware.Serialization.JsonNet.Tests.csproj
index 1657501..8360f16 100644
--- a/tests/Invisionware.Serialization.JsonNet.Tests/Invisionware.Serialization.JsonNet.Tests.csproj
+++ b/tests/Invisionware.Serialization.JsonNet.Tests/Invisionware.Serialization.JsonNet.Tests.csproj
@@ -12,7 +12,7 @@
 	<ItemGroup>
 		<PackageReference Include="FluentAssertions" Version="5.10.2" />
 		<PackageReference Include="nunit" Version="3.12.0" />
-		<PackageReference Include="NUnit3TestAdapter" Version="3.16.1" />
+		<PackageReference Include="NUnit3TestAdapter" Version="4.0.0" />
 		<PackageReference Include="Microsoft.NET.Test.Sdk" Version="16.5.0" />
 		<PackageReference Include="Serilog" Version="2.9.0" />
 		<PackageReference Include="System.Runtime.Serialization.Json" Version="4.3.0" />
diff --git a/tests/Invisionware.Serialization.NetCore.Tests/Invisionware.Serialization.NetCore.Tests.csproj b/tests/Invisionware.Serialization.NetCore.Tests/Invisionware.Serialization.NetCore.Tests.csproj
index 7da1217..5a860b5 100644
--- a/tests/Invisionware.Serialization.NetCore.Tests/Invisionware.Serialization.NetCore.Tests.csproj
+++ b/tests/Invisionware.Serialization.NetCore.Tests/Invisionware.Serialization.NetCore.Tests.csproj
@@ -12,7 +12,7 @@
 	<ItemGroup>
 		<PackageReference Include="FluentAssertions" Version="5.10.2" />
 		<PackageReference Include="nunit" Version="3.12.0" />
-		<PackageReference Include="NUnit3TestAdapter" Version="3.16.1" />
+		<PackageReference Include="NUnit3TestAdapter" Version="4.0.0" />
 		<PackageReference Include="Microsoft.NET.Test.Sdk" Version="16.5.0" />
 		<PackageReference Include="Serilog" Version="2.9.0" />
 	</ItemGroup>
diff --git a/tests/Invisionware.Serialization.Tests/Invisionware.Serialization.Tests.csproj b/tests/Invisionware.Serialization.Tests/Invisionware.Serialization.Tests.csproj
index ea6b0c4..29f5d6b 100644
--- a/tests/Invisionware.Serialization.Tests/Invisionware.Serialization.Tests.csproj
+++ b/tests/Invisionware.Serialization.Tests/Invisionware.Serialization.Tests.csproj
@@ -13,7 +13,7 @@
 		<PackageReference Include="FluentAssertions" Version="5.10.2" />
 		<PackageReference Include="Newtonsoft.Json" Version="12.0.3" />
 		<PackageReference Include="nunit" Version="3.12.0" />
-		<PackageReference Include="NUnit3TestAdapter" Version="3.16.1" />
+		<PackageReference Include="NUnit3TestAdapter" Version="4.0.0" />
 		<PackageReference Include="Microsoft.NET.Test.Sdk" Version="16.5.0" />
 		<PackageReference Include="Serilog" Version="2.9.0" />
 	</ItemGroup>