diff --git a/Iyzipay/IyzipayResource.cs b/Iyzipay/IyzipayResource.cs
index eae3538..be849a0 100644
--- a/Iyzipay/IyzipayResource.cs
+++ b/Iyzipay/IyzipayResource.cs
@@ -29,7 +29,7 @@ protected static WebHeaderCollection GetHttpHeaders(BaseRequest request, Options
             WebHeaderCollection headers = new WebHeaderCollection();
             headers.Add("Accept", "application/json");
             headers.Add(RANDOM_HEADER_NAME, randomString);
-            headers.Add(CLIENT_VERSION, "iyzipay-dotnet-2.1.6");
+            headers.Add(CLIENT_VERSION, "iyzipay-dotnet-2.1.8");
             headers.Add(AUTHORIZATION, PrepareAuthorizationString(request, randomString, options));
             return headers;
         }