diff --git a/src/Wolfgang.Extensions.Logging.InMemoryLogger/InMemoryLoggerBuilderExtensions.cs b/src/Wolfgang.Extensions.Logging.InMemoryLogger/InMemoryLoggerBuilderExtensions.cs
index 45fa458..84a757c 100644
--- a/src/Wolfgang.Extensions.Logging.InMemoryLogger/InMemoryLoggerBuilderExtensions.cs
+++ b/src/Wolfgang.Extensions.Logging.InMemoryLogger/InMemoryLoggerBuilderExtensions.cs
@@ -15,6 +15,9 @@ public static class InMemoryLoggerBuilderExtensions
 	/// <param name="builder">The <see cref="ILoggingBuilder"/> to add the provider to.</param>
 	/// <param name="provider">The <see cref="InMemoryLoggerProvider"/> instance to register.</param>
 	/// <returns>The <see cref="ILoggingBuilder"/> so that additional calls can be chained.</returns>
+	/// <exception cref="ArgumentNullException">
+	/// Thrown when <paramref name="builder"/> or <paramref name="provider"/> is <see langword="null"/>.
+	/// </exception>
 	/// <example>
 	/// <code>
 	/// var provider = new InMemoryLoggerProvider();
diff --git a/src/Wolfgang.Extensions.Logging.InMemoryLogger/InMemoryLoggerProvider.cs b/src/Wolfgang.Extensions.Logging.InMemoryLogger/InMemoryLoggerProvider.cs
index ce52f70..abc25e3 100644
--- a/src/Wolfgang.Extensions.Logging.InMemoryLogger/InMemoryLoggerProvider.cs
+++ b/src/Wolfgang.Extensions.Logging.InMemoryLogger/InMemoryLoggerProvider.cs
@@ -11,7 +11,7 @@ namespace Wolfgang.Extensions.Logging.InMemoryLogger;
 /// An <see cref="ILoggerProvider"/> that creates <see cref="InMemoryLogger"/> instances
 /// and provides access to all log entries across all loggers.
 /// </summary>
-public class InMemoryLoggerProvider : ILoggerProvider
+public sealed class InMemoryLoggerProvider : ILoggerProvider
 {
 	private readonly ConcurrentDictionary<string, InMemoryLogger> _loggers =
 		new ConcurrentDictionary<string, InMemoryLogger>(StringComparer.Ordinal);
@@ -36,6 +36,9 @@ public InMemoryLoggerProvider(LogLevel minLogLevel = LogLevel.Trace)
 	/// </summary>
 	/// <param name="categoryName">The category name for messages produced by the logger.</param>
 	/// <returns>An <see cref="ILogger"/> instance.</returns>
+	/// <exception cref="ArgumentNullException">
+	/// Thrown when <paramref name="categoryName"/> is <see langword="null"/>.
+	/// </exception>
 	public ILogger CreateLogger(string categoryName)
 	{
 		if (categoryName == null)
diff --git a/tests/Wolfgang.Extensions.Logging.InMemoryLogger.Tests.Unit/InMemoryLoggerOfTTests.cs b/tests/Wolfgang.Extensions.Logging.InMemoryLogger.Tests.Unit/InMemoryLoggerOfTTests.cs
index 76cf50c..9d1e968 100644
--- a/tests/Wolfgang.Extensions.Logging.InMemoryLogger.Tests.Unit/InMemoryLoggerOfTTests.cs
+++ b/tests/Wolfgang.Extensions.Logging.InMemoryLogger.Tests.Unit/InMemoryLoggerOfTTests.cs
@@ -30,12 +30,12 @@ public void Log_when_called_adds_entry_to_LogEntries()
             LogLevel.Information,
             new EventId(1, "TestEvent"),
             "Test message",
-            null,
-            (state, exception) => state
+            exception: null,
+            (state, _) => state
         );
 
         Assert.Single(sut.LogEntries);
-        var logEntry = sut.LogEntries.First();
+        var logEntry = sut.LogEntries[0];
         Assert.Equal(LogLevel.Information, logEntry.LogLevel);
         Assert.Equal(1, logEntry.EventId.Id);
         Assert.Equal("TestEvent", logEntry.EventId.Name);
diff --git a/tests/Wolfgang.Extensions.Logging.InMemoryLogger.Tests.Unit/InMemoryLoggerTests.cs b/tests/Wolfgang.Extensions.Logging.InMemoryLogger.Tests.Unit/InMemoryLoggerTests.cs
index b3efea2..e1e0f72 100644
--- a/tests/Wolfgang.Extensions.Logging.InMemoryLogger.Tests.Unit/InMemoryLoggerTests.cs
+++ b/tests/Wolfgang.Extensions.Logging.InMemoryLogger.Tests.Unit/InMemoryLoggerTests.cs
@@ -78,12 +78,12 @@ public void Log_when_called_adds_entry_to_LogEntries()
             LogLevel.Information,
             new EventId(1, "TestEvent"),
             "Test message",
-            null,
-            (state, exception) => state
+            exception: null,
+            (state, _) => state
         );
 
         Assert.Single(sut.LogEntries);
-        var logEntry = sut.LogEntries.First();
+        var logEntry = sut.LogEntries[0];
         Assert.Equal(LogLevel.Information, logEntry.LogLevel);
         Assert.Equal("TestCategory", logEntry.Category);
         Assert.Equal(1, logEntry.EventId.Id);