diff --git a/Octokit.Tests/Http/ApiConnectionTests.cs b/Octokit.Tests/Http/ApiConnectionTests.cs
index 5f3b7d22..b41d6cd0 100644
--- a/Octokit.Tests/Http/ApiConnectionTests.cs
+++ b/Octokit.Tests/Http/ApiConnectionTests.cs
@@ -342,7 +342,7 @@ namespace Octokit.Tests.Http
                     .Returns(Task.FromResult(response));
                 var apiConnection = new ApiConnection(connection);
 
-                var actualResult = await apiConnection.GetQueuedOperation<object>(queuedOperationUrl, Args.CancellationToken);
+                var actualResult = await apiConnection.GetQueuedOperation<object>(queuedOperationUrl, CancellationToken.None);
                 Assert.Same(actualResult, result);
             }
 
@@ -361,7 +361,7 @@ namespace Octokit.Tests.Http
                     .Returns(Task.FromResult(response));
                 var apiConnection = new ApiConnection(connection);
 
-                var actualResult = await apiConnection.GetQueuedOperation<object>(queuedOperationUrl, Args.CancellationToken);
+                var actualResult = await apiConnection.GetQueuedOperation<object>(queuedOperationUrl, CancellationToken.None);
                 Assert.Empty(actualResult);
             }
 
diff --git a/Octokit.Tests/Octokit.Tests.csproj b/Octokit.Tests/Octokit.Tests.csproj
index 17e333d0..c1362428 100644
--- a/Octokit.Tests/Octokit.Tests.csproj
+++ b/Octokit.Tests/Octokit.Tests.csproj
@@ -31,7 +31,7 @@
   <ItemGroup>
     <ProjectReference Include="..\Octokit\Octokit.csproj" />
     <ProjectReference Include="..\Octokit.Reactive\Octokit.Reactive.csproj" />
-    <PackageReference Include="NSubstitute" Version="3.1.0" />
+    <PackageReference Include="NSubstitute" Version="4.2.1" />
   </ItemGroup>
 
   <PropertyGroup Condition=" '$(TargetFramework)' == 'netcoreapp2.0' ">