diff --git a/src/EmailService/EmailService.csproj b/src/EmailService/EmailService.csproj
index 1aae8ac..939218b 100644
--- a/src/EmailService/EmailService.csproj
+++ b/src/EmailService/EmailService.csproj
@@ -5,7 +5,7 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="MailKit" Version="2.5.2" />
+    <PackageReference Include="MailKit" Version="4.16.0" />
     <PackageReference Include="Microsoft.VisualStudio.Web.CodeGeneration.Design" Version="3.1.1" />
   </ItemGroup>