diff --git a/Src/Configuration.DkimSigner/Configuration.DkimSigner.csproj b/Src/Configuration.DkimSigner/Configuration.DkimSigner.csproj
index 88173ac5..062b52c2 100644
--- a/Src/Configuration.DkimSigner/Configuration.DkimSigner.csproj
+++ b/Src/Configuration.DkimSigner/Configuration.DkimSigner.csproj
@@ -184,7 +184,7 @@
       <Version>1.0.0</Version>
     </PackageReference>
     <PackageReference Include="MimeKit">
-      <Version>4.3.0</Version>
+      <Version>4.7.1</Version>
     </PackageReference>
   </ItemGroup>
   <ItemGroup>