diff --git a/CHANGELOG.md b/CHANGELOG.md
index f69bff07..c3879168 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,5 @@
-### 6.4.2
-- Fix README links in NuGet package.
+### 6.4.3
+- Fix README links displayed on the NuGet package page.
 
 ### 6.4.0
 - **Introduced a new configuration API replacing the builder pattern**:
diff --git a/src/ConfigCat.Client.Tests/ConfigCacheTests.cs b/src/ConfigCat.Client.Tests/ConfigCacheTests.cs
index 96d74e49..a65c612f 100644
--- a/src/ConfigCat.Client.Tests/ConfigCacheTests.cs
+++ b/src/ConfigCat.Client.Tests/ConfigCacheTests.cs
@@ -1,4 +1,5 @@
-using System.Threading;
+using System.Net.Http;
+using System.Threading;
 using Microsoft.VisualStudio.TestTools.UnitTesting;
 using Moq;
 
@@ -10,6 +11,7 @@ namespace ConfigCat.Client.Tests
     public class ConfigCacheTests
     {
         private const string SDKKEY = "PKDVCLf-Hq-h-kCzMp-L7Q/psuH7BGHoUmdONrzzUOY7A";
+        private static readonly HttpClientHandler sharedHandler = new HttpClientHandler();
 
         [DataRow(true)]
         [DataRow(false)]
@@ -33,12 +35,14 @@ public void ConfigCache_Override_AutoPoll_Works(bool useNewCreateApi)
                     options.Logger = new ConsoleLogger(LogLevel.Debug);
                     options.PollingMode = PollingModes.AutoPoll();
                     options.ConfigCache = configCacheMock.Object;
+                    options.HttpClientHandler = sharedHandler;
                 })
                 : ConfigCatClientBuilder
                     .Initialize(SDKKEY)
                     .WithLogger(new ConsoleLogger(LogLevel.Debug))
                     .WithAutoPoll()
                     .WithConfigCache(configCacheMock.Object)
+                    .WithHttpClientHandler(sharedHandler)
                     .Create();
             
             var actual = client.GetValue("stringDefaultCat", "N/A");
@@ -70,8 +74,13 @@ public void ConfigCache_Override_ManualPoll_Works(bool useNewCreateApi)
                     options.Logger = new ConsoleLogger(LogLevel.Debug);
                     options.PollingMode = PollingModes.ManualPoll;
                     options.ConfigCache = configCacheMock.Object;
+                    options.HttpClientHandler = sharedHandler;
                 })
-                : ConfigCatClientBuilder.Initialize(SDKKEY).WithManualPoll().WithConfigCache(configCacheMock.Object).Create();
+                : ConfigCatClientBuilder.Initialize(SDKKEY)
+                    .WithManualPoll()
+                    .WithConfigCache(configCacheMock.Object)
+                    .WithHttpClientHandler(sharedHandler)
+                    .Create();
 
             configCacheMock.Verify(c => c.SetAsync(It.IsAny<string>(), It.IsAny<ProjectConfig>()), Times.Never);
             configCacheMock.Verify(c => c.GetAsync(It.IsAny<string>(), CancellationToken.None), Times.Never);
@@ -111,8 +120,13 @@ public void ConfigCache_Override_LazyLoad_Works(bool useNewCreateApi)
                     options.Logger = new ConsoleLogger(LogLevel.Debug);
                     options.PollingMode = PollingModes.LazyLoad();
                     options.ConfigCache = configCacheMock.Object;
+                    options.HttpClientHandler = sharedHandler;
                 })
-                : ConfigCatClientBuilder.Initialize(SDKKEY).WithLazyLoad().WithConfigCache(configCacheMock.Object).Create();
+                : ConfigCatClientBuilder.Initialize(SDKKEY)
+                    .WithLazyLoad()
+                    .WithConfigCache(configCacheMock.Object)
+                    .WithHttpClientHandler(sharedHandler)
+                    .Create();
 
             var actual = client.GetValue("stringDefaultCat", "N/A");
             Assert.AreEqual("Cat", actual);
diff --git a/src/ConfigCat.Client.Tests/SynchronizationContextDeadlockTests.cs b/src/ConfigCat.Client.Tests/SynchronizationContextDeadlockTests.cs
index 066174ec..8aa97572 100644
--- a/src/ConfigCat.Client.Tests/SynchronizationContextDeadlockTests.cs
+++ b/src/ConfigCat.Client.Tests/SynchronizationContextDeadlockTests.cs
@@ -5,6 +5,7 @@
 using System.Linq;
 using System.Reflection;
 using System.Threading.Tasks;
+using System.Net.Http;
 
 #pragma warning disable CS0618 // Type or member is obsolete
 namespace ConfigCat.Client.Tests
@@ -13,6 +14,7 @@ namespace ConfigCat.Client.Tests
     public class SynchronizationContextDeadlockTests
     {
         private const string SDKKEY = "PKDVCLf-Hq-h-kCzMp-L7Q/psuH7BGHoUmdONrzzUOY7A";
+        private static readonly HttpClientHandler sharedHandler = new HttpClientHandler();
 
         private readonly Mock<SynchronizationContext> syncContextMock;
 
@@ -52,11 +54,13 @@ public void AutoPollDeadLockCheck(bool useNewCreateApi)
                 {
                     options.SdkKey = SDKKEY;
                     options.Logger = new ConsoleLogger(LogLevel.Off);
+                    options.HttpClientHandler = sharedHandler;
                 })
                 : new ConfigCatClient(new AutoPollConfiguration
                 {
                     SdkKey = SDKKEY,
-                    Logger = new ConsoleLogger(LogLevel.Off)                
+                    Logger = new ConsoleLogger(LogLevel.Off),
+                    HttpClientHandler = sharedHandler,
                 });
 
             ClientDeadlockCheck(client);
@@ -72,11 +76,13 @@ public void ManualPollDeadLockCheck(bool useNewCreateApi)
                 {
                     options.SdkKey = SDKKEY;
                     options.Logger = new ConsoleLogger(LogLevel.Off);
+                    options.HttpClientHandler = sharedHandler;
                 })
                 : new ConfigCatClient(new ManualPollConfiguration
                 {
                     SdkKey = SDKKEY,
-                    Logger = new ConsoleLogger(LogLevel.Off)
+                    Logger = new ConsoleLogger(LogLevel.Off),
+                    HttpClientHandler = sharedHandler,
                 });
 
             ClientDeadlockCheck(client);
@@ -92,11 +98,13 @@ public void LazyLoadDeadLockCheck(bool useNewCreateApi)
                 {
                     options.SdkKey = SDKKEY;
                     options.Logger = new ConsoleLogger(LogLevel.Off);
+                    options.HttpClientHandler = sharedHandler;
                 })
                 : new ConfigCatClient(new LazyLoadConfiguration
                 {
                     SdkKey = SDKKEY,
-                    Logger = new ConsoleLogger(LogLevel.Off)
+                    Logger = new ConsoleLogger(LogLevel.Off),
+                    HttpClientHandler = sharedHandler,
                 });
 
             ClientDeadlockCheck(client);
diff --git a/src/ConfigCatClient/ConfigCatClient.csproj b/src/ConfigCatClient/ConfigCatClient.csproj
index 6b149ab1..2b7fec0c 100644
--- a/src/ConfigCatClient/ConfigCatClient.csproj
+++ b/src/ConfigCatClient/ConfigCatClient.csproj
@@ -11,7 +11,7 @@
     <Company>ConfigCat</Company>
     <Authors>ConfigCat</Authors>
     <PackageLicenseExpression>MIT</PackageLicenseExpression>
-    <PackageProjectUrl>https://github.com/ConfigCat/.net-sdk</PackageProjectUrl>
+    <PackageProjectUrl>https://configcat.com/docs/sdk-reference/csharp</PackageProjectUrl>
     <RepositoryUrl>https://github.com/ConfigCat/.net-sdk</RepositoryUrl>
     <RepositoryType>git</RepositoryType>
     <LangVersion>latest</LangVersion>