diff --git a/test/Flurl.Http.Xml.Tests/MicrosoftXmlSerializerShould.cs b/test/Flurl.Http.Xml.Tests/MicrosoftXmlSerializerShould.cs
index 7c75f25..ef94d95 100644
--- a/test/Flurl.Http.Xml.Tests/MicrosoftXmlSerializerShould.cs
+++ b/test/Flurl.Http.Xml.Tests/MicrosoftXmlSerializerShould.cs
@@ -3,8 +3,6 @@
 using Flurl.Http.Xml.Tests.Models;
 using Xunit;
 
-[assembly: CollectionBehavior(DisableTestParallelization = true)]
-
 namespace Flurl.Http.Xml.Tests
 {
     public class MicrosoftXmlSerializerShould
diff --git a/test/Flurl.Http.Xml.Tests/xunit.runner.json b/test/Flurl.Http.Xml.Tests/xunit.runner.json
new file mode 100644
index 0000000..c0d0ff0
--- /dev/null
+++ b/test/Flurl.Http.Xml.Tests/xunit.runner.json
@@ -0,0 +1,3 @@
+{
+  "parallelizeTestCollections":  false 
+}