diff --git a/src/Proffer.Email.Smtp/Proffer.Email.Smtp.csproj b/src/Proffer.Email.Smtp/Proffer.Email.Smtp.csproj
index 857ee28..4c45447 100644
--- a/src/Proffer.Email.Smtp/Proffer.Email.Smtp.csproj
+++ b/src/Proffer.Email.Smtp/Proffer.Email.Smtp.csproj
@@ -21,7 +21,7 @@
   </ItemGroup>
 
   <ItemGroup>
-    <PackageReference Include="MailKit" Version="2.12.0" />
+    <PackageReference Include="MailKit" Version="4.17.0" />
   </ItemGroup>
 
 </Project>