diff --git a/Rnwood.Smtp4dev/Rnwood.Smtp4dev.csproj b/Rnwood.Smtp4dev/Rnwood.Smtp4dev.csproj
index 8cb3d9658..f6e1e54c7 100644
--- a/Rnwood.Smtp4dev/Rnwood.Smtp4dev.csproj
+++ b/Rnwood.Smtp4dev/Rnwood.Smtp4dev.csproj
@@ -33,7 +33,7 @@
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     <PackageReference Include="HtmlAgilityPack" Version="1.11.71" />
     <PackageReference Include="Jint" Version="3.0.1" />
-    <PackageReference Include="Linq.Expression.Optimizer" Version="1.0.23" />
+    <PackageReference Include="Linq.Expression.Optimizer" Version="1.0.24" />
     <PackageReference Include="LinqKit" Version="1.3.7" />
     <PackageReference Include="MailKit" Version="4.9.0" />
      <PackageReference Include="Microsoft.AspNetCore.Hosting.WindowsServices" Version="8.0.11" />