diff --git a/HdrHistogram.Examples/RecorderExample.cs b/HdrHistogram.Examples/RecorderExample.cs
index a857c67..349f0e0 100644
--- a/HdrHistogram.Examples/RecorderExample.cs
+++ b/HdrHistogram.Examples/RecorderExample.cs
@@ -47,7 +47,7 @@ public void Run()
                 .WithThreadSafeReads()                  //returns a Recorder that wraps the LongConcurrentHistogram
                 .Create();
 
-            var outputThread = new Thread(ts => WriteToDisk((Recorder)ts));
+            var outputThread = new Thread(ts => WriteToDisk((Recorder)ts!));
             outputThread.Start(recorder);
 
             RecordMeasurements(recorder);
diff --git a/HdrHistogram.Examples/SimpleHistogramExample.cs b/HdrHistogram.Examples/SimpleHistogramExample.cs
index 62d6f16..6678946 100644
--- a/HdrHistogram.Examples/SimpleHistogramExample.cs
+++ b/HdrHistogram.Examples/SimpleHistogramExample.cs
@@ -21,7 +21,7 @@ namespace HdrHistogram.Examples
     static class SimpleHistogramExample
     {
         private static readonly LongHistogram Histogram = new LongHistogram(TimeStamp.Hours(1), 3);
-        private static volatile Socket _socket;
+        private static volatile Socket _socket = null!;
         private static readonly Lazy<AddressFamily> AddressFamily = new Lazy<AddressFamily>(() => GetAddressFamily("google.com"));
 
         private static readonly TimeSpan RunPeriod = TimeSpan.FromSeconds(10);
diff --git a/HdrHistogram.UnitTests/HgrmPercentileDistrubutionOutputTests.cs b/HdrHistogram.UnitTests/HgrmPercentileDistrubutionOutputTests.cs
index 37c63d2..8bccbbf 100644
--- a/HdrHistogram.UnitTests/HgrmPercentileDistrubutionOutputTests.cs
+++ b/HdrHistogram.UnitTests/HgrmPercentileDistrubutionOutputTests.cs
@@ -85,7 +85,7 @@ private Stream GetEmbeddedFileStream(string filename)
             var fileName = string.Format(CultureInfo.InvariantCulture, "HdrHistogram.UnitTests.Resources.{0}", filename);
             return GetType().GetTypeInfo()
                 .Assembly
-                .GetManifestResourceStream(fileName);
+                .GetManifestResourceStream(fileName)!;
         }
 
         private string GetEmbeddedFileText(string filename)
diff --git a/HdrHistogram.UnitTests/Persistence/HistogramLogReaderWriterTestBase.cs b/HdrHistogram.UnitTests/Persistence/HistogramLogReaderWriterTestBase.cs
index 435e6c3..8f2ccce 100644
--- a/HdrHistogram.UnitTests/Persistence/HistogramLogReaderWriterTestBase.cs
+++ b/HdrHistogram.UnitTests/Persistence/HistogramLogReaderWriterTestBase.cs
@@ -321,7 +321,7 @@ private Stream GetEmbeddedFileStream(string filename)
             var fileName = string.Format(CultureInfo.InvariantCulture, "HdrHistogram.UnitTests.Resources.{0}", filename);
             return GetType().GetTypeInfo()
                 .Assembly
-                .GetManifestResourceStream(fileName);
+                .GetManifestResourceStream(fileName)!;
         }
 
         protected abstract HistogramBase Create(long highestTrackableValue, int numberOfSignificantValueDigits);