diff --git a/.gitignore b/.gitignore
index 0c74c2a7..62a1fd09 100644
--- a/.gitignore
+++ b/.gitignore
@@ -350,3 +350,4 @@ MigrationBackup/
 .ionide/
 
 
+/.idea
diff --git a/Source/FikaAmazonAPI/AmazonSpApiSDK/Runtime/LWAClient.cs b/Source/FikaAmazonAPI/AmazonSpApiSDK/Runtime/LWAClient.cs
index 5244edf4..e1d11933 100644
--- a/Source/FikaAmazonAPI/AmazonSpApiSDK/Runtime/LWAClient.cs
+++ b/Source/FikaAmazonAPI/AmazonSpApiSDK/Runtime/LWAClient.cs
@@ -23,7 +23,10 @@ public LWAClient(LWAAuthorizationCredentials lwaAuthorizationCredentials)
 
             LWAAuthorizationCredentials = lwaAuthorizationCredentials;
             LWAAccessTokenRequestMetaBuilder = new LWAAccessTokenRequestMetaBuilder();
-            RestClient = new RestClient(LWAAuthorizationCredentials.Endpoint.GetLeftPart(UriPartial.Authority));
+            // RestClient = new RestClient(LWAAuthorizationCredentials.Endpoint.GetLeftPart(UriPartial.Authority));
+            RestClient =
+                RestClientSingleton.GetRestClient(
+                    LWAAuthorizationCredentials.Endpoint.GetLeftPart(UriPartial.Authority));
         }
 
 
diff --git a/Source/FikaAmazonAPI/AmazonSpApiSDK/Runtime/RestClientSingleton.cs b/Source/FikaAmazonAPI/AmazonSpApiSDK/Runtime/RestClientSingleton.cs
new file mode 100644
index 00000000..9d87ab76
--- /dev/null
+++ b/Source/FikaAmazonAPI/AmazonSpApiSDK/Runtime/RestClientSingleton.cs
@@ -0,0 +1,45 @@
+using System;
+using System.Net.Http;
+using RestSharp;
+using RestSharp.Serializers.NewtonsoftJson;
+
+namespace FikaAmazonAPI.AmazonSpApiSDK.Runtime
+{
+    /// <summary>
+    /// Get Singleton HttpClient
+    /// to fixed: RestClient not properly disposed causes memory / socket leaks
+    /// <see cref="https://github.com/abuzuhri/Amazon-SP-API-CSharp/issues/523"/>
+    /// </summary>
+    public static class RestClientSingleton
+    {
+        private static readonly HttpClient _httpClient = null;
+
+        static RestClientSingleton()
+        {
+            _httpClient = new HttpClient(new StandardSocketsHttpHandler
+            {
+                PooledConnectionLifetime = TimeSpan.FromMinutes(1)
+            });
+        }
+
+        /// <summary>
+        /// Get RestClient By Singleton HttpClient
+        /// </summary>
+        /// <param name="baseUrl"></param>
+        /// <returns></returns>
+        /// <exception cref="ArgumentException"></exception>
+        public static RestClient GetRestClient(string baseUrl)
+        {
+            if (!Uri.TryCreate(baseUrl, UriKind.Absolute, out var baseUri))
+            {
+                throw new ArgumentException($"argument of {baseUrl} is illegal");
+            }
+
+            var restClientOption = new RestClientOptions
+            {
+                BaseUrl = baseUri,
+            };
+            return new RestClient(_httpClient, restClientOption).UseNewtonsoftJson();
+        }
+    }
+}
\ No newline at end of file
diff --git a/Source/FikaAmazonAPI/FikaAmazonAPI.csproj b/Source/FikaAmazonAPI/FikaAmazonAPI.csproj
index 9594c2d9..1cc73c41 100644
--- a/Source/FikaAmazonAPI/FikaAmazonAPI.csproj
+++ b/Source/FikaAmazonAPI/FikaAmazonAPI.csproj
@@ -38,9 +38,11 @@
     <PackageReference Include="AWSSDK.SecurityToken" Version="3.7.100.52" />
     <PackageReference Include="AWSSDK.SQS" Version="3.7.100.52" />
     <PackageReference Include="Microsoft.CSharp" Version="4.7.0" />
+    <PackageReference Include="Microsoft.Extensions.Http" Version="7.0.0" />
     <PackageReference Include="Newtonsoft.Json" Version="13.0.2" />
     <PackageReference Include="RestSharp" Version="108.0.3" />
     <PackageReference Include="RestSharp.Serializers.NewtonsoftJson" Version="108.0.3" />
+    <PackageReference Include="StandardSocketsHttpHandler" Version="2.2.0.4" />
     <PackageReference Include="System.Collections" Version="4.3.0" />
     <PackageReference Include="System.ComponentModel.Annotations" Version="5.0.0" />
     <PackageReference Include="System.Reflection" Version="4.3.0" />
diff --git a/Source/FikaAmazonAPI/Services/RequestService.cs b/Source/FikaAmazonAPI/Services/RequestService.cs
index 904bb5bf..4188c9d9 100644
--- a/Source/FikaAmazonAPI/Services/RequestService.cs
+++ b/Source/FikaAmazonAPI/Services/RequestService.cs
@@ -56,8 +56,9 @@ public RequestService(AmazonCredential amazonCredential)
 
         private void CreateRequest(string url, RestSharp.Method method)
         {
-            RequestClient = new RestClient(ApiBaseUrl);
-            RequestClient.UseNewtonsoftJson();
+            RequestClient = RestClientSingleton.GetRestClient(ApiBaseUrl);
+            // RequestClient = new RestClient(ApiBaseUrl);
+            // RequestClient.UseNewtonsoftJson();
             Request = new RestRequest(url, method);
         }