diff --git a/FaunaDB.Client.Test/ClientTest.cs b/FaunaDB.Client.Test/ClientTest.cs
index 38fa36e3..0efafc97 100644
--- a/FaunaDB.Client.Test/ClientTest.cs
+++ b/FaunaDB.Client.Test/ClientTest.cs
@@ -234,7 +234,7 @@ public async Task TestGetAnInstance()
         [Test]
         public async Task TestGetAnInstanceWithCustomHeaders()
         {
-            var clientWithCustomHeaders = new FaunaClient(
+            var rootClientWithCustomHeaders = new FaunaClient(
                 secret: faunaSecret,
                 endpoint: faunaEndpoint,
                 customHeaders: new Dictionary<string, string>
@@ -244,6 +244,9 @@ public async Task TestGetAnInstanceWithCustomHeaders()
                 }
             );
 
+            var clientWithCustomHeadersKey = await rootClientWithCustomHeaders.Query(CreateKey(Obj("database", DbRef, "role", "server")));
+            var clientWithCustomHeaders = rootClientWithCustomHeaders.NewSessionClient(clientWithCustomHeadersKey.Get(SECRET_FIELD));
+
             await clientWithCustomHeaders.Query(
                 CreateCollection(
                     Obj("name", "magic_spells"))
diff --git a/FaunaDB.Client.Test/ParallelTest.cs b/FaunaDB.Client.Test/ParallelTest.cs
index 4d18b013..a9b0da4f 100644
--- a/FaunaDB.Client.Test/ParallelTest.cs
+++ b/FaunaDB.Client.Test/ParallelTest.cs
@@ -13,8 +13,8 @@ namespace Test
 {
     public class ParallelTest : TestCase
     {
-        private const int IN_PARALLEL = 1000;
-        private const int MAX_ATTEMPTS = 10;
+        private const int IN_PARALLEL = 200;
+        private const int MAX_ATTEMPTS = 5;
         private const string COLLECTION_NAME = "ParallelTestCollection";
 
         [OneTimeSetUp]