diff --git a/src/SmartEnum.SystemTextJson/SmartEnumValueConverter.cs b/src/SmartEnum.SystemTextJson/SmartEnumValueConverter.cs
index a2e9ee11..f0288a84 100644
--- a/src/SmartEnum.SystemTextJson/SmartEnumValueConverter.cs
+++ b/src/SmartEnum.SystemTextJson/SmartEnumValueConverter.cs
@@ -40,6 +40,10 @@ public override void Write(Utf8JsonWriter writer, TEnum value, JsonSerializerOpt
                 writer.WriteNullValue();
             else if (typeof(TValue) == typeof(bool))
                 writer.WriteBooleanValue((bool)(object)value.Value);
+            else if (typeof(TValue) == typeof(byte))
+                writer.WriteNumberValue((byte)(object)value.Value);
+            else if (typeof(TValue) == typeof(sbyte))
+                writer.WriteNumberValue((sbyte)(object)value.Value);
             else if (typeof(TValue) == typeof(short))
                 writer.WriteNumberValue((int)(short)(object)value.Value);
             else if (typeof(TValue) == typeof(int))
diff --git a/src/SmartEnum.SystemTextJson/SmartFlagEnumValueConverter.cs b/src/SmartEnum.SystemTextJson/SmartFlagEnumValueConverter.cs
index 22e093de..bc5ed8cb 100644
--- a/src/SmartEnum.SystemTextJson/SmartFlagEnumValueConverter.cs
+++ b/src/SmartEnum.SystemTextJson/SmartFlagEnumValueConverter.cs
@@ -96,6 +96,10 @@ public override void Write(Utf8JsonWriter writer, TEnum value, JsonSerializerOpt
             writer.WriteNullValue();
         else if (typeof(TValue) == typeof(bool))
             writer.WriteBooleanValue((bool)(object)value.Value);
+        else if (typeof(TValue) == typeof(byte))
+            writer.WriteNumberValue((byte)(object)value.Value);
+        else if (typeof(TValue) == typeof(sbyte))
+            writer.WriteNumberValue((sbyte)(object)value.Value);
         else if (typeof(TValue) == typeof(short))
             writer.WriteNumberValue((short)(object)value.Value);
         else if (typeof(TValue) == typeof(int))
diff --git a/test/SmartEnum.SystemTextJson.UnitTests/SmartEnumValueConverterTests.cs b/test/SmartEnum.SystemTextJson.UnitTests/SmartEnumValueConverterTests.cs
index d5aa08dc..a50329d0 100644
--- a/test/SmartEnum.SystemTextJson.UnitTests/SmartEnumValueConverterTests.cs
+++ b/test/SmartEnum.SystemTextJson.UnitTests/SmartEnumValueConverterTests.cs
@@ -14,6 +14,12 @@ public class TestClass
             [JsonConverter(typeof(SmartEnumValueConverter<TestEnumBoolean, bool>))]
             public TestEnumBoolean Bool { get; set; }
 
+            [JsonConverter(typeof(SmartEnumValueConverter<TestEnumByte, byte>))]
+            public TestEnumByte Byte { get; set; }
+
+            [JsonConverter(typeof(SmartEnumValueConverter<TestEnumSByte, sbyte>))]
+            public TestEnumSByte SByte { get; set; }
+
             [JsonConverter(typeof(SmartEnumValueConverter<TestEnumInt16, short>))]
             public TestEnumInt16 Int16 { get; set; }
 
@@ -34,6 +40,8 @@ public class TestClass
         static readonly TestClass TestInstance = new TestClass
         {
             Bool = TestEnumBoolean.Instance,
+            Byte = TestEnumByte.Instance,
+            SByte = TestEnumSByte.Instance,
             Int16 = TestEnumInt16.Instance,
             Int32 = TestEnumInt32.Instance,
             Double = TestEnumDouble.Instance,
@@ -45,6 +53,8 @@ public class TestClass
         static readonly string JsonString = JsonSerializer.Serialize(new
         {
             Bool = true,
+            Byte = 1,
+            SByte = 1,
             Int16 = 1,
             Int32 = 1,
             Double = 1.2,
@@ -67,6 +77,8 @@ public void DeserializesValue()
             var obj = JsonSerializer.Deserialize<TestClass>(JsonString, TestJsonConverters.ValueConverterOptions);
 
             obj.Bool.Should().BeSameAs(TestEnumBoolean.Instance);
+            obj.Byte.Should().BeSameAs(TestEnumByte.Instance);
+            obj.SByte.Should().BeSameAs(TestEnumSByte.Instance);
             obj.Int16.Should().BeSameAs(TestEnumInt16.Instance);
             obj.Int32.Should().BeSameAs(TestEnumInt32.Instance);
             obj.Double.Should().BeSameAs(TestEnumDouble.Instance);
@@ -83,6 +95,8 @@ public void DeserializesNullByDefault()
             var obj = JsonSerializer.Deserialize<TestClass>(json);
 
             obj.Bool.Should().BeNull();
+            obj.Byte.Should().BeNull();
+            obj.SByte.Should().BeNull();
             obj.Int16.Should().BeNull();
             obj.Int32.Should().BeNull();
             obj.Double.Should().BeNull();
@@ -109,6 +123,8 @@ public void DeserializeThrowsWhenNotFound()
             new TheoryData<string, string>
             {
                 { @"{ ""Bool"": 1 }", @"Cannot get the value of a token type 'Number' as a boolean." },
+                { @"{ ""Byte"": true }", @"Cannot get the value of a token type 'True' as a number." },
+                { @"{ ""SByte"": true }", @"Cannot get the value of a token type 'True' as a number." },
                 { @"{ ""Int16"": true }", @"Cannot get the value of a token type 'True' as a number." },
                 { @"{ ""Int32"": true }", @"Cannot get the value of a token type 'True' as a number." },
                 { @"{ ""Double"": true }", @"Cannot get the value of a token type 'True' as a number." },
diff --git a/test/SmartEnum.SystemTextJson.UnitTests/TestEnums.cs b/test/SmartEnum.SystemTextJson.UnitTests/TestEnums.cs
index 7f30514d..91bb71c0 100644
--- a/test/SmartEnum.SystemTextJson.UnitTests/TestEnums.cs
+++ b/test/SmartEnum.SystemTextJson.UnitTests/TestEnums.cs
@@ -11,6 +11,20 @@ public sealed class TestEnumBoolean : SmartEnum<TestEnumBoolean, bool>
         TestEnumBoolean(string name, bool value) : base(name, value) { }
     }
 
+    public sealed class TestEnumByte : SmartEnum<TestEnumByte, byte>
+    {
+        public static readonly TestEnumByte Instance = new TestEnumByte(nameof(Instance), 1);
+
+        TestEnumByte(string name, byte value) : base(name, value) { }
+    }
+
+    public sealed class TestEnumSByte : SmartEnum<TestEnumSByte, sbyte>
+    {
+        public static readonly TestEnumSByte Instance = new TestEnumSByte(nameof(Instance), 1);
+
+        TestEnumSByte(string name, sbyte value) : base(name, value) { }
+    }
+
     public sealed class TestEnumInt16 : SmartEnum<TestEnumInt16, short>
     {
         public static readonly TestEnumInt16 Instance = new TestEnumInt16(nameof(Instance), 1);