diff --git a/Source/Digst.OioIdws.OioWsTrust/Utils/XmlSignatureUtils.cs b/Source/Digst.OioIdws.OioWsTrust/Utils/XmlSignatureUtils.cs
index 2b77572..8a60207 100644
--- a/Source/Digst.OioIdws.OioWsTrust/Utils/XmlSignatureUtils.cs
+++ b/Source/Digst.OioIdws.OioWsTrust/Utils/XmlSignatureUtils.cs
@@ -32,7 +32,7 @@ public static XDocument SignDocument(XDocument xDoc, IEnumerable<string> ids, X5
             var signedXml = new SignedXmlWithIdResolvement(doc);
             signedXml.SignedInfo.CanonicalizationMethod = SignedXml.XmlDsigExcC14NTransformUrl;
             signedXml.SignedInfo.SignatureMethod = RsaPkcs1Sha256SignatureDescription.XmlDsigMoreRsaSha256Url;
-            signedXml.SigningKey = cert.PrivateKey;
+            signedXml.SigningKey = cert.GetRSAPrivateKey();
 
             // Make a reference for each element that must be signed.
             foreach (var id in ids)
diff --git a/Source/Digst.OioIdws.Rest.Client/Digst.OioIdws.Rest.Client.csproj b/Source/Digst.OioIdws.Rest.Client/Digst.OioIdws.Rest.Client.csproj
index fa3ccc0..0b57265 100644
--- a/Source/Digst.OioIdws.Rest.Client/Digst.OioIdws.Rest.Client.csproj
+++ b/Source/Digst.OioIdws.Rest.Client/Digst.OioIdws.Rest.Client.csproj
@@ -33,9 +33,8 @@
     <DocumentationFile>bin\Release\Digst.OioIdws.Rest.Client.xml</DocumentationFile>
   </PropertyGroup>
   <ItemGroup>
-    <Reference Include="Newtonsoft.Json, Version=7.0.0.0, Culture=neutral, PublicKeyToken=30ad4fe6b2a6aeed, processorArchitecture=MSIL">
-      <HintPath>..\..\packages\Newtonsoft.Json.7.0.1\lib\net45\Newtonsoft.Json.dll</HintPath>
-      <Private>True</Private>
+    <Reference Include="Newtonsoft.Json, Version=13.0.0.0, Culture=neutral, PublicKeyToken=30ad4fe6b2a6aeed, processorArchitecture=MSIL">
+      <HintPath>..\..\packages\Newtonsoft.Json.13.0.3\lib\net45\Newtonsoft.Json.dll</HintPath>
     </Reference>
     <Reference Include="System" />
     <Reference Include="System.Core" />
@@ -76,10 +75,10 @@
     <None Include="Digst.OioIdws.Rest.Client.nuspec">
       <SubType>Designer</SubType>
     </None>
-    <None Include="packages.config" />
   </ItemGroup>
   <ItemGroup>
     <Content Include="readme.txt" />
+    <None Include="packages.config" />
     <None Include="Release instructions.txt" />
   </ItemGroup>
   <Import Project="$(MSBuildToolsPath)\Microsoft.CSharp.targets" />
diff --git a/Source/Digst.OioIdws.Rest.Client/packages.config b/Source/Digst.OioIdws.Rest.Client/packages.config
index 284ec0a..fef83be 100644
--- a/Source/Digst.OioIdws.Rest.Client/packages.config
+++ b/Source/Digst.OioIdws.Rest.Client/packages.config
@@ -1,4 +1,4 @@
 <?xml version="1.0" encoding="utf-8"?>
 <packages>
-  <package id="Newtonsoft.Json" version="7.0.1" targetFramework="net45" />
+  <package id="Newtonsoft.Json" version="13.0.3" targetFramework="net472" />
 </packages>
\ No newline at end of file