diff --git a/Project/Send-MailKitMessage.csproj b/Project/Send-MailKitMessage.csproj
index 359785a..0d21549 100644
--- a/Project/Send-MailKitMessage.csproj
+++ b/Project/Send-MailKitMessage.csproj
@@ -21,7 +21,7 @@
   </ItemGroup>
   <ItemGroup>
     <PackageReference Include="MailKit" Version="2.12.0" />
-    <PackageReference Include="MimeKit" Version="2.12.0" />
+    <PackageReference Include="MimeKit" Version="4.15.1" />
     <PackageReference Include="Portable.BouncyCastle" Version="1.8.10" />
     <PackageReference Include="PowerShellStandard.Library" Version="5.1.0-preview-06">
       <PrivateAssets>All</PrivateAssets>