diff --git a/context.tests/context.tests.csproj b/context.tests/context.tests.csproj
index 54349b2..f8dcc15 100644
--- a/context.tests/context.tests.csproj
+++ b/context.tests/context.tests.csproj
@@ -74,9 +74,9 @@
       <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
     </PackageReference>
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.7.2" />
-    <PackageReference Include="MimeKit" Version="3.6.0" />
+    <PackageReference Include="MimeKit" Version="4.2.0" />
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.7.2" />
-    <PackageReference Include="MimeKit" Version="3.6.0" />
+    <PackageReference Include="MimeKit" Version="4.2.0" />
     <PackageReference Include="xunit" Version="2.5.0" />
     <PackageReference Include="xunit.runner.visualstudio" Version="2.5.0">
       <PrivateAssets>all</PrivateAssets>
diff --git a/context/context.csproj b/context/context.csproj
index 7eaffe0..d42d9d1 100644
--- a/context/context.csproj
+++ b/context/context.csproj
@@ -1,4 +1,4 @@
-<Project Sdk="Microsoft.NET.Sdk">
+<Project Sdk="Microsoft.NET.Sdk">
   <PropertyGroup>
     <TargetFramework>netstandard2.0</TargetFramework>
     <Product>DirectProject.DotNet.Context</Product>
@@ -33,7 +33,7 @@
   </ItemGroup>
 
   <ItemGroup>
-    <PackageReference Include="MimeKit" Version="3.6.0" />
+    <PackageReference Include="MimeKit" Version="4.2.0" />
   </ItemGroup>
 
   <ItemGroup>