diff --git a/src/Exceptionless.Insulation/Exceptionless.Insulation.csproj b/src/Exceptionless.Insulation/Exceptionless.Insulation.csproj
index 39e68a2232..1c0ca3b50c 100644
--- a/src/Exceptionless.Insulation/Exceptionless.Insulation.csproj
+++ b/src/Exceptionless.Insulation/Exceptionless.Insulation.csproj
@@ -12,7 +12,7 @@
     <PackageReference Include="Microsoft.Extensions.DependencyInjection" Version="11.0.0" />
     <PackageReference Include="Microsoft.Extensions.DependencyModel" Version="11.0.0" />
     <PackageReference Include="Microsoft.Extensions.Logging.Console" Version="11.0.0" />
-    <PackageReference Include="MailKit" Version="4.18.2" />
+    <PackageReference Include="MailKit" Version="5.0.0" />
     <PackageReference Include="Serilog.Extensions.Logging" Version="10.0.0" />
     <PackageReference Include="Serilog.Formatting.Compact" Version="3.0.0" />
     <PackageReference Include="Serilog.Settings.Configuration" Version="10.0.1" />
@@ -20,8 +20,6 @@
     <PackageReference Include="Serilog.Sinks.ExceptionLess" Version="5.0.0" />
     <!-- AWSSDK.Extensions.CborProtocol (via Foundatio.AWS) pins 9.0.5, which has GHSA-vmv3-wvjp-wqpj. -->
     <PackageReference Include="System.Formats.Cbor" Version="11.0.0" />
-    <!-- MimeKit (via MailKit) allows 10.0.0, which has GHSA-2fmv-rv2c-59x7 and GHSA-846f-f764-76mx. -->
-    <PackageReference Include="System.Security.Cryptography.Pkcs" Version="11.0.0" />
     <PackageReference Include="YamlDotNet" Version="18.1.0" />
   </ItemGroup>
   <ItemGroup>
diff --git a/src/Exceptionless.Insulation/Mail/MailKitMailSender.cs b/src/Exceptionless.Insulation/Mail/MailKitMailSender.cs
index 517b896fc4..af80775f51 100644
--- a/src/Exceptionless.Insulation/Mail/MailKitMailSender.cs
+++ b/src/Exceptionless.Insulation/Mail/MailKitMailSender.cs
@@ -1,6 +1,7 @@
 using System.Diagnostics;
 using Exceptionless.Core.Configuration;
 using Exceptionless.Core.Mail;
+using MailKit;
 using MailKit.Net.Smtp;
 using MailKit.Security;
 using Microsoft.Extensions.Logging;