diff --git a/Anthropic.SDK.Tests/Anthropic.SDK.Tests.csproj b/Anthropic.SDK.Tests/Anthropic.SDK.Tests.csproj
index c397e73..16d28ab 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="9.5.0" />
+    <PackageReference Include="Microsoft.Extensions.AI" Version="9.6.0" />
     <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="1.54.0" />
-    <PackageReference Include="Microsoft.SemanticKernel.Abstractions" Version="1.54.0" />
+    <PackageReference Include="Microsoft.SemanticKernel" Version="1.58.0" />
+    <PackageReference Include="Microsoft.SemanticKernel.Abstractions" Version="1.58.0" />
     <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.ChatClient.cs b/Anthropic.SDK.Tests/Messages.ChatClient.cs
index 6dd55a0..6a1d1b2 100644
--- a/Anthropic.SDK.Tests/Messages.ChatClient.cs
+++ b/Anthropic.SDK.Tests/Messages.ChatClient.cs
@@ -1,4 +1,5 @@
-using System.Diagnostics;
+using System.Collections.ObjectModel;
+using System.Diagnostics;
 using System.IO;
 using System.Reflection;
 using System.Text;
@@ -232,6 +233,28 @@ public async Task TestNonStreamingFunctionCalls()
                 res.Text);
         }
 
+        [TestMethod]
+        public async Task TestNonStreamingWebSearchCalls()
+        {
+            IChatClient client = new AnthropicClient().Messages
+                .AsBuilder()
+                .UseFunctionInvocation()
+                .Build();
+
+            ChatOptions options = new()
+            {
+                ModelId = AnthropicModels.Claude4Sonnet,
+                MaxOutputTokens = 5000,
+                Tools = [new HostedWebSearchTool()]
+            };
+
+            var res = await client.GetResponseAsync("What is the weather like in San Francisco, CA right now?", options);
+
+            Assert.IsTrue(
+                res.Text.Contains("San Francisco") is true,
+                res.Text);
+        }
+
         [TestMethod]
         public async Task TestStreamingFunctionCalls()
         {
diff --git a/Anthropic.SDK/Anthropic.SDK.csproj b/Anthropic.SDK/Anthropic.SDK.csproj
index d51a115..88db21a 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>
-		  Web Search, MCP Servers, and Claude 4 Models, Minor Bug Fixes
+		  Improvements to Microsoft.Extensions.AI.Abstractions integration
 	  </PackageReleaseNotes>
 	  <PackageId>Anthropic.SDK</PackageId>
-	  <Version>5.4.1</Version>
-	  <AssemblyVersion>5.4.1.0</AssemblyVersion>
-	  <FileVersion>5.4.1.0</FileVersion>
+	  <Version>5.4.2</Version>
+	  <AssemblyVersion>5.4.2.0</AssemblyVersion>
+	  <FileVersion>5.4.2.0</FileVersion>
 	  <GenerateDocumentationFile>True</GenerateDocumentationFile>
 	  <PackageReadmeFile>README.md</PackageReadmeFile>
 	  <PackageIcon>icon.png</PackageIcon>
@@ -34,7 +34,7 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="Microsoft.Extensions.AI.Abstractions" Version="9.5.0" />
+    <PackageReference Include="Microsoft.Extensions.AI.Abstractions" Version="9.6.0" />
     <PackageReference Include="Microsoft.Bcl.AsyncInterfaces" Version="8.0.0" />
   </ItemGroup>
 
diff --git a/Anthropic.SDK/Messaging/ChatClientHelper.cs b/Anthropic.SDK/Messaging/ChatClientHelper.cs
index 9898396..5117cb3 100644
--- a/Anthropic.SDK/Messaging/ChatClientHelper.cs
+++ b/Anthropic.SDK/Messaging/ChatClientHelper.cs
@@ -86,6 +86,9 @@ public static MessageParameters CreateMessageParameters(IChatClient client, IEnu
                             case HostedCodeInterpreterTool ci:
                                 tools.Add(Common.Tool.CodeInterpreter);
                                 break;
+                            case HostedWebSearchTool wt:
+                                tools.Add(ServerTools.GetWebSearchTool(5));
+                                break;
                         }
                     }
                 }