diff --git a/src/IIIF/IIIF.Tests/Serialisation/ImageService3SerialiserTests.cs b/src/IIIF/IIIF.Tests/Serialisation/ImageService3SerialiserTests.cs
new file mode 100644
index 0000000..004c6e7
--- /dev/null
+++ b/src/IIIF/IIIF.Tests/Serialisation/ImageService3SerialiserTests.cs
@@ -0,0 +1,38 @@
+using FluentAssertions;
+using IIIF.ImageApi.Service;
+using IIIF.Serialisation;
+using Xunit;
+
+namespace IIIF.Tests.Serialisation
+{
+    public class ImageService3SerialiserTests
+    {
+        [Fact]
+        public void WriteJson_OutputsExpected_IfNoProfileOrProfileDescription()
+        {
+            // Arrange
+            var imageService = new ImageService3 { Id = "foo" };
+            const string expected = "{\n  \"id\": \"foo\",\n  \"type\": \"ImageService3\"\n}";
+            
+            // Act
+            var result = imageService.AsJson().Replace("\r\n", "\n");
+            
+            // Assert
+            result.Should().Be(expected);
+        }
+        
+        [Fact]
+        public void WriteJson_OutputsExpected_ProfileOnly()
+        {
+            // Arrange
+            var imageService = new ImageService3 { Id = "foo", Profile = "bar" };
+            const string expected = "{\n  \"id\": \"foo\",\n  \"type\": \"ImageService3\",\n  \"profile\": \"bar\"\n}";
+
+            // Act
+            var result = imageService.AsJson().Replace("\r\n", "\n");
+            
+            // Assert
+            result.Should().Be(expected);
+        }
+    }
+}
\ No newline at end of file
diff --git a/src/IIIF/IIIF/ImageApi/Service/ImageService3.cs b/src/IIIF/IIIF/ImageApi/Service/ImageService3.cs
index b4e8010..7bd473f 100644
--- a/src/IIIF/IIIF/ImageApi/Service/ImageService3.cs
+++ b/src/IIIF/IIIF/ImageApi/Service/ImageService3.cs
@@ -9,15 +9,10 @@ public class ImageService3 : ResourceBase
         public const string Image3Context = "http://iiif.io/api/image/3/context.json";
         public const string ImageProtocol = "http://iiif.io/api/image";
 
-        public ImageService3()
-        {
-            Context = Image3Context;
-        }
-
         public override string Type => nameof(ImageService3);
 
-        [JsonProperty(Order = 3)]
-        public string Protocol => ImageProtocol;
+        [JsonProperty(Order = 10)]
+        public string Protocol { get; set; }
 
         [JsonProperty(Order = 11)]
         public int Width { get; set; }
diff --git a/src/IIIF/IIIF/Serialisation/ServiceReferenceConverter.cs b/src/IIIF/IIIF/Serialisation/ServiceReferenceConverter.cs
index 36a0e31..f03bda4 100644
--- a/src/IIIF/IIIF/Serialisation/ServiceReferenceConverter.cs
+++ b/src/IIIF/IIIF/Serialisation/ServiceReferenceConverter.cs
@@ -1,5 +1,4 @@
-using IIIF.Presentation.V2.Serialisation;
-using Newtonsoft.Json;
+using Newtonsoft.Json;
 
 namespace IIIF.Serialisation
 {
diff --git a/src/IIIF/IIIF/Serialisation/SizeConverter.cs b/src/IIIF/IIIF/Serialisation/SizeConverter.cs
index abf5a2c..fcda0c1 100644
--- a/src/IIIF/IIIF/Serialisation/SizeConverter.cs
+++ b/src/IIIF/IIIF/Serialisation/SizeConverter.cs
@@ -1,5 +1,4 @@
-using IIIF.Presentation.V2.Serialisation;
-using Newtonsoft.Json;
+using Newtonsoft.Json;
 
 namespace IIIF.Serialisation
 {
diff --git a/src/IIIF/IIIF/Serialisation/TargetConverter.cs b/src/IIIF/IIIF/Serialisation/TargetConverter.cs
index 8489503..067431d 100644
--- a/src/IIIF/IIIF/Serialisation/TargetConverter.cs
+++ b/src/IIIF/IIIF/Serialisation/TargetConverter.cs
@@ -1,5 +1,4 @@
 using System;
-using System.Linq;
 using IIIF.Presentation.V3;
 using IIIF.Utils;
 using Newtonsoft.Json;