diff --git a/DNN Platform/Library/packages.config b/DNN Platform/Library/packages.config
index 430f4aeb128..33deafc981d 100644
--- a/DNN Platform/Library/packages.config	
+++ b/DNN Platform/Library/packages.config	
@@ -13,7 +13,7 @@
   <package id="Microsoft.SourceLink.Common" version="1.1.1" targetFramework="net472" developmentDependency="true" />
   <package id="Microsoft.SourceLink.GitHub" version="1.1.1" targetFramework="net472" developmentDependency="true" />
   <package id="Microsoft.Web.Infrastructure" version="1.0.0.0" targetFramework="net45" />
-  <package id="MimeKit" version="2.15.1" targetFramework="net472" />
+  <package id="MimeKit" version="3.4.3" targetFramework="net472" />
   <package id="Newtonsoft.Json" version="13.0.2" targetFramework="net472" />
   <package id="PetaPoco.Compiled" version="6.0.524" targetFramework="net472" />
   <package id="Portable.BouncyCastle" version="1.9.0" targetFramework="net472" />