diff --git a/App.config b/App.config
index 0eb4a86..36f3f80 100644
--- a/App.config
+++ b/App.config
@@ -9,6 +9,10 @@
         <assemblyIdentity name="BouncyCastle.Crypto" publicKeyToken="0e99375e54769942" culture="neutral" />
         <bindingRedirect oldVersion="0.0.0.0-1.8.9.0" newVersion="1.8.9.0" />
       </dependentAssembly>
+      <dependentAssembly>
+        <assemblyIdentity name="MimeKit" publicKeyToken="bede1c8a46c66814" culture="neutral" />
+        <bindingRedirect oldVersion="0.0.0.0-4.16.0.0" newVersion="4.16.0.0" />
+      </dependentAssembly>
     </assemblyBinding>
   </runtime>
 </configuration>
diff --git a/EmailWithAttachedFile.csproj b/EmailWithAttachedFile.csproj
index b87e7f4..0e4c079 100644
--- a/EmailWithAttachedFile.csproj
+++ b/EmailWithAttachedFile.csproj
@@ -39,22 +39,49 @@
     <Reference Include="BouncyCastle.Crypto, Version=1.8.9.0, Culture=neutral, PublicKeyToken=0e99375e54769942, processorArchitecture=MSIL">
       <HintPath>packages\Portable.BouncyCastle.1.8.9\lib\net40\BouncyCastle.Crypto.dll</HintPath>
     </Reference>
+    <Reference Include="BouncyCastle.Cryptography, Version=2.0.0.0, Culture=neutral, PublicKeyToken=072edcf4a5328938">
+      <HintPath>packages\BouncyCastle.Cryptography.2.6.2\lib\net461\BouncyCastle.Cryptography.dll</HintPath>
+      <Private>True</Private>
+    </Reference>
     <Reference Include="FileHelpers">
       <HintPath>packages\FileHelpers.3.4.2\lib\net45\FileHelpers.dll</HintPath>
     </Reference>
-    <Reference Include="MailKit, Version=2.10.0.0, Culture=neutral, PublicKeyToken=4e064fe7c44a8f1b, processorArchitecture=MSIL">
-      <HintPath>packages\MailKit.2.10.0\lib\net48\MailKit.dll</HintPath>
+    <Reference Include="MailKit, Version=4.16.0.0, Culture=neutral, PublicKeyToken=4e064fe7c44a8f1b">
+      <HintPath>packages\MailKit.4.16.0\lib\net48\MailKit.dll</HintPath>
+      <Private>True</Private>
     </Reference>
     <Reference Include="Microsoft.VisualBasic" />
-    <Reference Include="MimeKit, Version=2.10.0.0, Culture=neutral, PublicKeyToken=bede1c8a46c66814, processorArchitecture=MSIL">
-      <HintPath>packages\MimeKit.2.10.1\lib\net48\MimeKit.dll</HintPath>
+    <Reference Include="MimeKit, Version=4.16.0.0, Culture=neutral, PublicKeyToken=bede1c8a46c66814">
+      <HintPath>packages\MimeKit.4.16.0\lib\net48\MimeKit.dll</HintPath>
+      <Private>True</Private>
     </Reference>
     <Reference Include="System" />
-    <Reference Include="System.Buffers, Version=4.0.3.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51, processorArchitecture=MSIL">
-      <HintPath>packages\System.Buffers.4.5.1\lib\net461\System.Buffers.dll</HintPath>
+    <Reference Include="System.Buffers, Version=4.0.5.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51">
+      <HintPath>packages\System.Buffers.4.6.1\lib\net462\System.Buffers.dll</HintPath>
+      <Private>True</Private>
     </Reference>
     <Reference Include="System.Data" />
+    <Reference Include="System.Formats.Asn1, Version=10.0.0.6, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51">
+      <HintPath>packages\System.Formats.Asn1.10.0.6\lib\net462\System.Formats.Asn1.dll</HintPath>
+      <Private>True</Private>
+    </Reference>
+    <Reference Include="System.Memory, Version=4.0.5.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51">
+      <HintPath>packages\System.Memory.4.6.3\lib\net462\System.Memory.dll</HintPath>
+      <Private>True</Private>
+    </Reference>
+    <Reference Include="System.Numerics.Vectors, Version=4.1.6.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a">
+      <HintPath>packages\System.Numerics.Vectors.4.6.1\lib\net462\System.Numerics.Vectors.dll</HintPath>
+      <Private>True</Private>
+    </Reference>
+    <Reference Include="System.Runtime.CompilerServices.Unsafe, Version=6.0.3.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a">
+      <HintPath>packages\System.Runtime.CompilerServices.Unsafe.6.1.2\lib\net462\System.Runtime.CompilerServices.Unsafe.dll</HintPath>
+      <Private>True</Private>
+    </Reference>
     <Reference Include="System.Security" />
+    <Reference Include="System.Threading.Tasks.Extensions, Version=4.2.4.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51">
+      <HintPath>packages\System.Threading.Tasks.Extensions.4.6.3\lib\net462\System.Threading.Tasks.Extensions.dll</HintPath>
+      <Private>True</Private>
+    </Reference>
     <Reference Include="System.Xml" />
     <Reference Include="Microsoft.CSharp" />
     <Reference Include="System.Core" />
@@ -127,4 +154,11 @@
   <Target Name="AfterBuild">
   </Target>
   -->
+  <Import Project="packages\System.ValueTuple.4.6.2\build\net471\System.ValueTuple.targets" Condition="Exists('packages\System.ValueTuple.4.6.2\build\net471\System.ValueTuple.targets')" />
+  <Target Name="EnsureNuGetPackageBuildImports" BeforeTargets="PrepareForBuild">
+    <PropertyGroup>
+      <ErrorText>This project references NuGet package(s) that are missing on this computer. Enable NuGet Package Restore to download them.  For more information, see http://go.microsoft.com/fwlink/?LinkID=322105.The missing file is {0}.</ErrorText>
+    </PropertyGroup>
+    <Error Condition="!Exists('packages\System.ValueTuple.4.6.2\build\net471\System.ValueTuple.targets')" Text="$([System.String]::Format('$(ErrorText)', 'packages\System.ValueTuple.4.6.2\build\net471\System.ValueTuple.targets'))" />
+  </Target>
 </Project>
\ No newline at end of file
diff --git a/packages.config b/packages.config
index 46e9e6e..c3d8f7e 100644
--- a/packages.config
+++ b/packages.config
@@ -1,7 +1,14 @@
 <?xml version="1.0" encoding="utf-8"?>
 <packages>
-  <package id="MailKit" version="2.10.0" targetFramework="net48" />
-  <package id="MimeKit" version="2.10.1" targetFramework="net48" />
+  <package id="BouncyCastle.Cryptography" version="2.6.2" targetFramework="net48" />
+  <package id="MailKit" version="4.16.0" targetFramework="net48" />
+  <package id="MimeKit" version="4.16.0" targetFramework="net48" />
   <package id="Portable.BouncyCastle" version="1.8.9" targetFramework="net48" />
-  <package id="System.Buffers" version="4.5.1" targetFramework="net48" />
+  <package id="System.Buffers" version="4.6.1" targetFramework="net48" />
+  <package id="System.Formats.Asn1" version="10.0.6" targetFramework="net48" />
+  <package id="System.Memory" version="4.6.3" targetFramework="net48" />
+  <package id="System.Numerics.Vectors" version="4.6.1" targetFramework="net48" />
+  <package id="System.Runtime.CompilerServices.Unsafe" version="6.1.2" targetFramework="net48" />
+  <package id="System.Threading.Tasks.Extensions" version="4.6.3" targetFramework="net48" />
+  <package id="System.ValueTuple" version="4.6.2" targetFramework="net48" />
 </packages>
\ No newline at end of file