diff --git a/Jvw.DevToys.SemverCalculator.Tests/Assembly.cs b/Jvw.DevToys.SemverCalculator.Tests/Assembly.cs
new file mode 100644
index 0000000..5461c19
--- /dev/null
+++ b/Jvw.DevToys.SemverCalculator.Tests/Assembly.cs
@@ -0,0 +1,3 @@
+using System.Diagnostics.CodeAnalysis;
+
+[assembly: SuppressMessage("Performance", "CA1869", Justification = "Do not cache JsonSerializerOptions in tests.")]
diff --git a/Jvw.DevToys.SemverCalculator.Tests/DictionaryToKeysListConverterTests.cs b/Jvw.DevToys.SemverCalculator.Tests/DictionaryToKeysListConverterTests.cs
index e689843..1bb6726 100644
--- a/Jvw.DevToys.SemverCalculator.Tests/DictionaryToKeysListConverterTests.cs
+++ b/Jvw.DevToys.SemverCalculator.Tests/DictionaryToKeysListConverterTests.cs
@@ -1,4 +1,3 @@
-using System.Text;
 using System.Text.Json;
 using Jvw.DevToys.SemverCalculator.Converters;