diff --git a/Anthropic.SDK.ComputerUse/Anthropic.SDK.ComputerUse.csproj b/Anthropic.SDK.ComputerUse/Anthropic.SDK.ComputerUse.csproj
index 77d9997..61dc9fd 100644
--- a/Anthropic.SDK.ComputerUse/Anthropic.SDK.ComputerUse.csproj
+++ b/Anthropic.SDK.ComputerUse/Anthropic.SDK.ComputerUse.csproj
@@ -9,7 +9,7 @@
 
   <ItemGroup>
     <PackageReference Include="SharpHook" Version="5.3.8" />
-    <PackageReference Include="SixLabors.ImageSharp" Version="3.1.7" />
+    <PackageReference Include="SixLabors.ImageSharp" Version="3.1.11" />
     <PackageReference Include="System.Drawing.Common" Version="8.0.11" />
   </ItemGroup>
 
diff --git a/Anthropic.SDK.Tests/Anthropic.SDK.Tests.csproj b/Anthropic.SDK.Tests/Anthropic.SDK.Tests.csproj
index 9391f96..c92f70e 100644
--- a/Anthropic.SDK.Tests/Anthropic.SDK.Tests.csproj
+++ b/Anthropic.SDK.Tests/Anthropic.SDK.Tests.csproj
@@ -35,13 +35,13 @@
   <ItemGroup>
     <PackageReference Include="Google.Cloud.AIPlatform.V1" Version="3.24.0" />
     <PackageReference Include="Microsoft.Bcl.AsyncInterfaces" Version="8.0.0" />
-    <PackageReference Include="Microsoft.Extensions.AI" Version="9.7.0" />
+    <PackageReference Include="Microsoft.Extensions.AI" Version="9.7.1" />
     <PackageReference Include="Microsoft.Extensions.Configuration" Version="8.0.0" />
     <PackageReference Include="Microsoft.Extensions.Configuration.Binder" Version="8.0.0" />
     <PackageReference Include="Microsoft.Extensions.Configuration.Json" Version="8.0.0" />
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.13.0" />
-    <PackageReference Include="Microsoft.SemanticKernel" Version="1.60.0" />
-    <PackageReference Include="Microsoft.SemanticKernel.Abstractions" Version="1.60.0" />
+    <PackageReference Include="Microsoft.SemanticKernel" Version="1.61.0" />
+    <PackageReference Include="Microsoft.SemanticKernel.Abstractions" Version="1.61.0" />
     <PackageReference Include="MSTest.TestAdapter" Version="3.8.2" />
     <PackageReference Include="MSTest.TestFramework" Version="3.8.2" />
     <PackageReference Include="coverlet.collector" Version="3.1.2" />
diff --git a/Anthropic.SDK.Tests/Messages.cs b/Anthropic.SDK.Tests/Messages.cs
index 4ca3723..dce326a 100644
--- a/Anthropic.SDK.Tests/Messages.cs
+++ b/Anthropic.SDK.Tests/Messages.cs
@@ -9,7 +9,7 @@ namespace Anthropic.SDK.Tests
     public class Messages
     {
         [TestMethod]
-        public async Task TestBasicClaude21Message()
+        public async Task TestBasicClaude4SonnetMessage()
         {
             var client = new AnthropicClient();
             var messages = new List<Message>();
@@ -18,7 +18,7 @@ public async Task TestBasicClaude21Message()
             {
                 Messages = messages,
                 MaxTokens = 512,
-                Model = AnthropicModels.Claude_v2_1,
+                Model = AnthropicModels.Claude4Sonnet,
                 Stream = false,
                 Temperature = 1.0m,
             };
@@ -126,7 +126,7 @@ public async Task TestStreamingClaude3HaikuMessage()
         }
 
         [TestMethod]
-        public async Task TestStreamingClaude21Message()
+        public async Task TestStreamingClaude4SonnetMessage()
         {
             var client = new AnthropicClient();
             var messages = new List<Message>();
@@ -135,7 +135,7 @@ public async Task TestStreamingClaude21Message()
             {
                 Messages = messages,
                 MaxTokens = 512,
-                Model = AnthropicModels.Claude_v2_1,
+                Model = AnthropicModels.Claude4Sonnet,
                 Stream = true,
                 Temperature = 1.0m,
             };
diff --git a/Anthropic.SDK.Tests/Tools.cs b/Anthropic.SDK.Tests/Tools.cs
index 00c67ff..1c82dfe 100644
--- a/Anthropic.SDK.Tests/Tools.cs
+++ b/Anthropic.SDK.Tests/Tools.cs
@@ -92,7 +92,7 @@ public async Task TestBasicTool()
             {
                 Messages = messages,
                 MaxTokens = 2048,
-                Model = AnthropicModels.Claude3Sonnet,
+                Model = AnthropicModels.Claude4Sonnet,
                 Stream = false,
                 Temperature = 1.0m,
                 Tools = tools.ToList()
@@ -127,7 +127,7 @@ public async Task TestEmptyArgsTool()
             {
                 Messages = messages,
                 MaxTokens = 2048,
-                Model = AnthropicModels.Claude3Sonnet,
+                Model = AnthropicModels.Claude4Sonnet,
                 Stream = false,
                 Temperature = 1.0m,
                 Tools = tools.ToList()
@@ -166,7 +166,7 @@ public async Task TestFuncTool()
             {
                 Messages = messages,
                 MaxTokens = 2048,
-                Model = AnthropicModels.Claude3Sonnet,
+                Model = AnthropicModels.Claude4Sonnet,
                 Stream = false,
                 Temperature = 1.0m,
                 Tools = tools
@@ -205,7 +205,7 @@ public async Task TestFuncErrorTool()
             {
                 Messages = messages,
                 MaxTokens = 2048,
-                Model = AnthropicModels.Claude3Sonnet,
+                Model = AnthropicModels.Claude4Sonnet,
                 Stream = false,
                 Temperature = 1.0m,
                 Tools = tools
@@ -253,7 +253,7 @@ public async Task TestStaticObjectTool()
             {
                 Messages = messages,
                 MaxTokens = 2048,
-                Model = AnthropicModels.Claude3Sonnet,
+                Model = AnthropicModels.Claude4Sonnet,
                 Stream = false,
                 Temperature = 1.0m,
                 Tools = tools
@@ -302,7 +302,7 @@ public async Task TestInstanceObjectTool()
             {
                 Messages = messages,
                 MaxTokens = 2048,
-                Model = AnthropicModels.Claude3Sonnet,
+                Model = AnthropicModels.Claude4Sonnet,
                 Stream = false,
                 Temperature = 1.0m,
                 Tools = tools
@@ -350,7 +350,7 @@ public async Task TestMathFuncTool()
             {
                 Messages = messages,
                 MaxTokens = 2048,
-                Model = AnthropicModels.Claude3Sonnet,
+                Model = AnthropicModels.Claude4Sonnet,
                 Stream = false,
                 Temperature = 1.0m,
                 Tools = tools
@@ -411,7 +411,7 @@ public async Task TestBasicToolManual()
             {
                 Messages = messages,
                 MaxTokens = 2048,
-                Model = AnthropicModels.Claude3Sonnet,
+                Model = AnthropicModels.Claude4Sonnet,
                 Stream = false,
                 Temperature = 1.0m,
                 Tools = tools
@@ -464,7 +464,7 @@ public async Task TestFuncBoolTool()
             {
                 Messages = messages,
                 MaxTokens = 2048,
-                Model = AnthropicModels.Claude3Sonnet,
+                Model = AnthropicModels.Claude4Sonnet,
                 Stream = false,
                 Temperature = 1.0m,
                 Tools = tools
@@ -506,7 +506,7 @@ public async Task TestFuncListTool()
             {
                 Messages = messages,
                 MaxTokens = 2048,
-                Model = AnthropicModels.Claude3Sonnet,
+                Model = AnthropicModels.Claude4Sonnet,
                 Stream = false,
                 Temperature = 1.0m,
                 Tools = tools
@@ -553,7 +553,7 @@ public async Task TestFuncArrayTool()
             {
                 Messages = messages,
                 MaxTokens = 2048,
-                Model = AnthropicModels.Claude3Sonnet,
+                Model = AnthropicModels.Claude4Sonnet,
                 Stream = false,
                 Temperature = 1.0m,
                 Tools = tools,
@@ -604,7 +604,7 @@ public async Task TestFuncMultiTool()
             {
                 Messages = messages,
                 MaxTokens = 2048,
-                Model = AnthropicModels.Claude3Sonnet,
+                Model = AnthropicModels.Claude4Sonnet,
                 Stream = false,
                 Temperature = 1.0m,
                 Tools = tools
@@ -741,7 +741,7 @@ public class ColorProperty
 
 
         [TestMethod]
-        public async Task TestClaude3ImageJsonModeMessage()
+        public async Task TestClaude4ImageJsonModeMessage()
         {
             string resourceName = "Anthropic.SDK.Tests.Red_Apple.jpg";
 
@@ -826,7 +826,7 @@ public async Task TestClaude3ImageJsonModeMessage()
             {
                 Messages = messages,
                 MaxTokens = 1024,
-                Model = AnthropicModels.Claude3Sonnet,
+                Model = AnthropicModels.Claude4Sonnet,
                 Stream = false,
                 Temperature = 1.0m,
                 Tools = tools
@@ -858,7 +858,7 @@ public async Task TestMultipleCallsSameFunction()
             {
                 Messages = messages,
                 MaxTokens = 2048,
-                Model = AnthropicModels.Claude3Sonnet,
+                Model = AnthropicModels.Claude4Sonnet,
                 Stream = false,
                 Temperature = 1.0m,
                 Tools = tools
diff --git a/Anthropic.SDK/Anthropic.SDK.csproj b/Anthropic.SDK/Anthropic.SDK.csproj
index c25e28a..31cd271 100644
--- a/Anthropic.SDK/Anthropic.SDK.csproj
+++ b/Anthropic.SDK/Anthropic.SDK.csproj
@@ -14,12 +14,12 @@
 	  <PackageTags>Claude, AI, ML, API, Anthropic</PackageTags>
 	  <Title>Claude API</Title>
 	  <PackageReleaseNotes>
-		  Updates Microsoft.Extensions.AI.Abstractions, Tool Call Bug Fix
+		  Updates Microsoft.Extensions.AI.Abstractions, Strong Name Assembly, Model Constant Deprecations
 	  </PackageReleaseNotes>
 	  <PackageId>Anthropic.SDK</PackageId>
-	  <Version>5.4.3</Version>
-	  <AssemblyVersion>5.4.3.0</AssemblyVersion>
-	  <FileVersion>5.4.3.0</FileVersion>
+	  <Version>5.5.0</Version>
+	  <AssemblyVersion>5.5.0.0</AssemblyVersion>
+	  <FileVersion>5.5.0.0</FileVersion>
 	  <GenerateDocumentationFile>True</GenerateDocumentationFile>
 	  <PackageReadmeFile>README.md</PackageReadmeFile>
 	  <PackageIcon>icon.png</PackageIcon>
@@ -31,10 +31,12 @@
 	  <!-- Optional: Build symbol package (.snupkg) to distribute the PDB containing Source Link -->
 	  <IncludeSymbols>true</IncludeSymbols>
 	  <SymbolPackageFormat>snupkg</SymbolPackageFormat>
+	  <SignAssembly>True</SignAssembly>
+	  <AssemblyOriginatorKeyFile>Anthropic.SDK.snk</AssemblyOriginatorKeyFile>
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="Microsoft.Extensions.AI.Abstractions" Version="9.7.0" />
+    <PackageReference Include="Microsoft.Extensions.AI.Abstractions" Version="9.7.1" />
     <PackageReference Include="Microsoft.Bcl.AsyncInterfaces" Version="8.0.0" />
   </ItemGroup>
 
diff --git a/Anthropic.SDK/Anthropic.SDK.snk b/Anthropic.SDK/Anthropic.SDK.snk
new file mode 100644
index 0000000..cc239b5
Binary files /dev/null and b/Anthropic.SDK/Anthropic.SDK.snk differ
diff --git a/Anthropic.SDK/Constants/AnthropicModels.cs b/Anthropic.SDK/Constants/AnthropicModels.cs
index 6b22c1d..6515732 100644
--- a/Anthropic.SDK/Constants/AnthropicModels.cs
+++ b/Anthropic.SDK/Constants/AnthropicModels.cs
@@ -7,31 +7,11 @@
     /// </summary>
     public static class AnthropicModels
     {
-        /// <summary>
-        /// Claude V2.1 latest full version.
-        /// </summary>
-        public const string Claude_v2_1 = "claude-2.1";
-
-        /// <summary>
-        /// Claude V2.0 latest full version.
-        /// </summary>
-        public const string Claude_v2_0 = "claude-2.0";
-
-        /// <summary>
-        /// Claude Instant V1.2 latest full version.
-        /// </summary>
-        public const string ClaudeInstant_v1_2 = "claude-instant-1.2";
-
         /// <summary>
         /// Claude 3 Opus
         /// </summary>
         public const string Claude3Opus = "claude-3-opus-20240229";
         
-        /// <summary>
-        /// Claude 3 Sonnet
-        /// </summary>
-        public const string Claude3Sonnet = "claude-3-sonnet-20240229";
-        
         /// <summary>
         /// Claude 3.5 Sonnet
         /// </summary>
diff --git a/Anthropic.SDK/Constants/VertexAIModels.cs b/Anthropic.SDK/Constants/VertexAIModels.cs
index c3d09c4..916e9a1 100644
--- a/Anthropic.SDK/Constants/VertexAIModels.cs
+++ b/Anthropic.SDK/Constants/VertexAIModels.cs
@@ -10,11 +10,6 @@ public static class VertexAIModels
         /// </summary>
         public const string Claude3Opus = "claude-3-opus@20240229";
         
-        /// <summary>
-        /// Claude 3 Sonnet on Vertex AI - Balanced Claude model for a wide range of tasks
-        /// </summary>
-        public const string Claude3Sonnet = "claude-3-sonnet@20240229";
-        
         /// <summary>
         /// Claude 3 Haiku on Vertex AI - Fastest and most compact model for near-instant responsiveness
         /// </summary>
diff --git a/Anthropic.SDK/Messaging/VertexAIMessagesEndpoint.cs b/Anthropic.SDK/Messaging/VertexAIMessagesEndpoint.cs
index e28e004..1ae8172 100644
--- a/Anthropic.SDK/Messaging/VertexAIMessagesEndpoint.cs
+++ b/Anthropic.SDK/Messaging/VertexAIMessagesEndpoint.cs
@@ -28,7 +28,7 @@ internal VertexAIMessagesEndpoint(VertexAIClient client) : base(client) { }
         /// <summary>
         /// The default model to use when no model is specified in the request parameters
         /// </summary>
-        protected override string Model => Constants.VertexAIModels.Claude3Sonnet;
+        protected override string Model => Constants.VertexAIModels.Claude4Sonnet;
 
         /// <summary>
         /// Makes a non-streaming call to the Claude messages API via Vertex AI. Be sure to set stream to false in <param name="parameters"></param>.