diff --git a/JsonSubTypes.Tests.Net35/JsonSubTypes.Tests.Net35.csproj b/JsonSubTypes.Tests.Net35/JsonSubTypes.Tests.Net35.csproj
index ee2f238..bb32dc3 100644
--- a/JsonSubTypes.Tests.Net35/JsonSubTypes.Tests.Net35.csproj
+++ b/JsonSubTypes.Tests.Net35/JsonSubTypes.Tests.Net35.csproj
@@ -17,7 +17,7 @@
   <ItemGroup>
     <PackageReference Include="Newtonsoft.Json" Version="13.0.4" />
     <PackageReference Include="NUnit" Version="3.14.0" />
-    <PackageReference Include="NUnit3TestAdapter" Version="4.6.0" />
+    <PackageReference Include="NUnit3TestAdapter" Version="6.1.0" />
     <PackageReference Include="TaskParallelLibrary" Version="1.0.2856.0" />
   </ItemGroup>
   <ItemGroup>
diff --git a/JsonSubTypes.Tests/JsonSubTypes.Tests.csproj b/JsonSubTypes.Tests/JsonSubTypes.Tests.csproj
index 9af6128..d9d6712 100644
--- a/JsonSubTypes.Tests/JsonSubTypes.Tests.csproj
+++ b/JsonSubTypes.Tests/JsonSubTypes.Tests.csproj
@@ -18,7 +18,7 @@
   <ItemGroup>
     <PackageReference Include="Newtonsoft.Json" Version="13.0.4" />
     <PackageReference Include="NUnit" Version="3.14.0" />
-    <PackageReference Include="NUnit3TestAdapter" Version="4.6.0" />
+    <PackageReference Include="NUnit3TestAdapter" Version="6.1.0" />
   </ItemGroup>
   <ItemGroup>
     <ProjectReference Include="..\JsonSubTypes\JsonSubTypes.csproj" />