diff --git a/tests/Invisionware.Caching.ASPNET.Tests/Invisionware.Caching.ASPNET.Tests.csproj b/tests/Invisionware.Caching.ASPNET.Tests/Invisionware.Caching.ASPNET.Tests.csproj
index 647ddcd..62c2c03 100644
--- a/tests/Invisionware.Caching.ASPNET.Tests/Invisionware.Caching.ASPNET.Tests.csproj
+++ b/tests/Invisionware.Caching.ASPNET.Tests/Invisionware.Caching.ASPNET.Tests.csproj
@@ -10,7 +10,7 @@
 	<ItemGroup>
 		<PackageReference Include="Invisionware.Serialization" Version="1.1.18" />
 		<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" />
 	</ItemGroup>
 
diff --git a/tests/Invisionware.Caching.Sqlite.Tests/Invisionware.Caching.Sqlite.Tests.csproj b/tests/Invisionware.Caching.Sqlite.Tests/Invisionware.Caching.Sqlite.Tests.csproj
index 8c31602..6e1fc21 100644
--- a/tests/Invisionware.Caching.Sqlite.Tests/Invisionware.Caching.Sqlite.Tests.csproj
+++ b/tests/Invisionware.Caching.Sqlite.Tests/Invisionware.Caching.Sqlite.Tests.csproj
@@ -10,7 +10,7 @@
 	<ItemGroup>
 		<PackageReference Include="Invisionware.Serialization" Version="1.1.18" />
 		<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" />
 	</ItemGroup>
 
diff --git a/tests/Invisionware.Caching.SystemRuntime.Tests/Invisionware.Caching.SystemRuntime.Tests.csproj b/tests/Invisionware.Caching.SystemRuntime.Tests/Invisionware.Caching.SystemRuntime.Tests.csproj
index a419338..414fdd8 100644
--- a/tests/Invisionware.Caching.SystemRuntime.Tests/Invisionware.Caching.SystemRuntime.Tests.csproj
+++ b/tests/Invisionware.Caching.SystemRuntime.Tests/Invisionware.Caching.SystemRuntime.Tests.csproj
@@ -10,7 +10,7 @@
 	<ItemGroup>
 		<PackageReference Include="Invisionware.Serialization" Version="1.1.18" />
 		<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" />
 	</ItemGroup>
 
diff --git a/tests/Invisionware.Caching.Tests/Invisionware.Caching.Tests.csproj b/tests/Invisionware.Caching.Tests/Invisionware.Caching.Tests.csproj
index 3365a1e..5cbdbe0 100644
--- a/tests/Invisionware.Caching.Tests/Invisionware.Caching.Tests.csproj
+++ b/tests/Invisionware.Caching.Tests/Invisionware.Caching.Tests.csproj
@@ -10,7 +10,7 @@
 	<ItemGroup>
 		<PackageReference Include="Invisionware.Serialization" Version="1.1.18" />
 		<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" />
 	</ItemGroup>