diff --git a/GitHubActionsTestLogger.Tests/MtpSummarySpecs.cs b/GitHubActionsTestLogger.Tests/MtpSummarySpecs.cs
index a6892d7..ff5dcfc 100644
--- a/GitHubActionsTestLogger.Tests/MtpSummarySpecs.cs
+++ b/GitHubActionsTestLogger.Tests/MtpSummarySpecs.cs
@@ -370,6 +370,7 @@ public async Task I_can_try_to_use_the_logger_to_produce_a_summary_when_the_outp
         await app.RunAsync();
 
         await summaryWriter.FlushAsync();
+        await summaryWriter.DisposeAsync();
 
         // Assert
         var commandOutput = commandWriter.ToString();
diff --git a/GitHubActionsTestLogger.Tests/VsTestSummarySpecs.cs b/GitHubActionsTestLogger.Tests/VsTestSummarySpecs.cs
index 8e0c41b..b34035a 100644
--- a/GitHubActionsTestLogger.Tests/VsTestSummarySpecs.cs
+++ b/GitHubActionsTestLogger.Tests/VsTestSummarySpecs.cs
@@ -415,6 +415,7 @@ public async Task I_can_try_to_use_the_logger_to_produce_a_summary_when_the_outp
         );
 
         await summaryWriter.FlushAsync();
+        await summaryWriter.DisposeAsync();
 
         // Assert
         var commandOutput = commandWriter.ToString();