diff --git a/Rnwood.Smtp4dev.Tests/Rnwood.Smtp4dev.Tests.csproj b/Rnwood.Smtp4dev.Tests/Rnwood.Smtp4dev.Tests.csproj
index 641856101..66a0ca628 100644
--- a/Rnwood.Smtp4dev.Tests/Rnwood.Smtp4dev.Tests.csproj
+++ b/Rnwood.Smtp4dev.Tests/Rnwood.Smtp4dev.Tests.csproj
@@ -10,7 +10,7 @@
   </ItemGroup>
 
   <ItemGroup>
-    <PackageReference Include="MailKit" Version="2.8.0" />
+    <PackageReference Include="MailKit" Version="2.9.0" />
     <PackageReference Include="MedallionShell" Version="1.6.1" />
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="16.7.1" />
     <PackageReference Include="Selenium.Support" Version="3.141.0" />
diff --git a/Rnwood.Smtp4dev/Rnwood.Smtp4dev.csproj b/Rnwood.Smtp4dev/Rnwood.Smtp4dev.csproj
index 7712427b6..e11284d10 100644
--- a/Rnwood.Smtp4dev/Rnwood.Smtp4dev.csproj
+++ b/Rnwood.Smtp4dev/Rnwood.Smtp4dev.csproj
@@ -21,7 +21,7 @@
 	<ItemGroup>
 		<PackageReference Include="CommandLiners.MonoOptions" Version="1.0.36" />
 		<PackageReference Include="HtmlAgilityPack" Version="1.11.24" />
-		<PackageReference Include="MailKit" Version="2.8.0" />
+		<PackageReference Include="MailKit" Version="2.9.0" />
 		<PackageReference Include="Microsoft.AspNet.OData" Version="7.4.1" />
 		<PackageReference Include="Microsoft.AspNetCore.Hosting.WindowsServices" Version="3.1.8" />
 		<PackageReference Include="Microsoft.AspNetCore.SignalR" Version="1.1.0" />