diff --git a/CosmosSharp/CosmosSharp.csproj b/CosmosSharp/CosmosSharp.csproj
index c0d28ff..b0af6eb 100644
--- a/CosmosSharp/CosmosSharp.csproj
+++ b/CosmosSharp/CosmosSharp.csproj
@@ -11,7 +11,7 @@
 		<Copyright>Copyright (c) 2021 BTCTrader</Copyright>
 		<PackageId>BTCTrader.CosmosSharp</PackageId>
 		<Product>BTCTrader.CosmosSharp</Product>
-		<Version>1.1.2</Version>
+		<Version>1.1.3</Version>
 	</PropertyGroup>
 
 	<ItemGroup>
@@ -19,7 +19,7 @@
 		<PackageReference Include="Microsoft.AspNetCore.Mvc.NewtonsoftJson" Version="3.0.0" />
 		<PackageReference Include="NBitcoin.Secp256k1" Version="1.0.1" />
 		<PackageReference Include="NBitcoin" Version="5.0.27" />
-		<PackageReference Include="RestSharp" Version="106.11.7" />
+		<PackageReference Include="RestSharp" Version="108.0.1" />
 	</ItemGroup>
 
 </Project>
diff --git a/CosmosSharp/HttpHandler.cs b/CosmosSharp/HttpHandler.cs
index 9d3f6c8..9deaa25 100644
--- a/CosmosSharp/HttpHandler.cs
+++ b/CosmosSharp/HttpHandler.cs
@@ -15,7 +15,7 @@ async Task<TResponseData> IHttpHandler.GetJsonAsync<TResponseData>(string url, D
         {
             // TODO: RestClient --> HttpClient
             var client = new RestClient(url);
-            var request = new RestRequest(Method.GET);
+            var request = new RestRequest();
             if (headerKeyValues != null && headerKeyValues.Count > 0)
             {
                 foreach (var (key, value) in headerKeyValues)
@@ -38,11 +38,11 @@ async Task<TResponseData> IHttpHandler.GetJsonAsync<TResponseData>(string url, D
             return result;
         }
 
-        Task<TResponseData> IHttpHandler.PostJsonAsync<TResponseData, TRequestData>(string url, Dictionary<string, string> headerKeyValues, TRequestData requestBody)
+        async Task<TResponseData> IHttpHandler.PostJsonAsync<TResponseData, TRequestData>(string url, Dictionary<string, string> headerKeyValues, TRequestData requestBody)
         {
             // TODO: RestClient --> HttpClient
             var client = new RestClient(url);
-            var request = new RestRequest(Method.POST);
+            var request = new RestRequest();
             var body= JsonConvert.SerializeObject(requestBody);
             if (headerKeyValues != null && headerKeyValues.Count > 0)
             {
@@ -52,7 +52,7 @@ Task<TResponseData> IHttpHandler.PostJsonAsync<TResponseData, TRequestData>(stri
                 }
             }
             request.AddJsonBody(body);
-            var response = client.Execute(request);
+            var response = await client.ExecutePostAsync(request);
 
             if (response.StatusCode != HttpStatusCode.OK)
             {
@@ -62,10 +62,10 @@ Task<TResponseData> IHttpHandler.PostJsonAsync<TResponseData, TRequestData>(stri
             if(response.Content == null) throw new Exception($"Response is null. Status code: {response.StatusCode}");
             
             var result = JsonConvert.DeserializeObject<TResponseData>(response.Content);
-            return Task.FromResult(result);
+            return result;
         }
 
-        private Exception GetApiError(Uri BaseUrl, IRestRequest request, IRestResponse response)
+        private Exception GetApiError(Uri BaseUrl, RestRequest request, RestResponse response)
         {
             //Get the values of the parameters passed to the API
             string parameters = string.Join(", ", request.Parameters.Select(x => x.Name.ToString() + "=" + ((x.Value == null) ? "NULL" : x.Value)).ToArray());