diff --git a/Octokit.Tests/Http/ConnectionTests.cs b/Octokit.Tests/Http/ConnectionTests.cs
index 3e352839..45e9bfe1 100644
--- a/Octokit.Tests/Http/ConnectionTests.cs
+++ b/Octokit.Tests/Http/ConnectionTests.cs
@@ -439,7 +439,7 @@ namespace Octokit.Tests.Http
                 httpClient.Received().Send(Arg.Is<IRequest>(req =>
                     req.BaseAddress == _exampleUri &&
                     req.Body == body &&
-                    req.Headers["Accept"] == "application/vnd.github.v3+json; charset=utf-8" &&
+                    req.Headers["Accept"] == "application/vnd.github.moondragon+json; charset=utf-8,application/vnd.github.v3+json; charset=utf-8" &&
                     req.ContentType == "application/arbitrary" &&
                     req.Method == HttpMethod.Post &&
                     req.Endpoint == new Uri("https://other.host.com/path?query=val")), Args.CancellationToken);
diff --git a/Octokit.Tests/Http/JsonHttpPipelineTests.cs b/Octokit.Tests/Http/JsonHttpPipelineTests.cs
index be4b19ea..68dbea2f 100644
--- a/Octokit.Tests/Http/JsonHttpPipelineTests.cs
+++ b/Octokit.Tests/Http/JsonHttpPipelineTests.cs
@@ -30,7 +30,7 @@ namespace Octokit.Tests.Http
                 jsonPipeline.SerializeRequest(request);
 
                 Assert.Contains("Accept", request.Headers.Keys);
-                Assert.Equal("application/vnd.github.v3+json; charset=utf-8", request.Headers["Accept"]);
+                Assert.Equal("application/vnd.github.moondragon+json; charset=utf-8,application/vnd.github.v3+json; charset=utf-8", request.Headers["Accept"]);
             }
 
             [Fact]