diff --git a/src/Seq.Syntax/BuiltIns/SeqBuiltInPropertyNameResolver.cs b/src/Seq.Syntax/BuiltIns/SeqBuiltInPropertyNameResolver.cs
index d7febca..3c456ef 100644
--- a/src/Seq.Syntax/BuiltIns/SeqBuiltInPropertyNameResolver.cs
+++ b/src/Seq.Syntax/BuiltIns/SeqBuiltInPropertyNameResolver.cs
@@ -13,7 +13,7 @@ public override bool TryResolveBuiltInPropertyName(string alias, [NotNullWhen(tr
     {
         target = alias switch
         {
-            "Properties" => "{..@p, @seqid: undefined(), @i: undefined(), @tr: undefined(), @sp: undefined(), @ra: undefined(), @st: undefined(), @ps: undefined(), @sa: undefined()}",
+            "Properties" => "{..@p, @seqid: undefined(), @i: undefined(), @ra: undefined(), @st: undefined(), @ps: undefined(), @sa: undefined()}",
             "Timestamp" => "@t",
             "Level" => "@l",
             "Message" => "@m",
@@ -21,11 +21,11 @@ public override bool TryResolveBuiltInPropertyName(string alias, [NotNullWhen(tr
             "EventType" => "@i",
             "Exception" => "@x",
             "Id" => "@p['@seqid']",
-            "TraceId" or "tr" => "@p['@tr']",
-            "SpanId" or "sp" => "@p['@sp']",
+            "TraceId" => "@tr",
+            "SpanId" => "@sp",
             "Resource" or "ra" => "@p['@ra']",
-            "Start" or "st" => "@p['@st']",
             "ParentId" or "ps" => "@p['@ps']",
+            "Start" or "st" => "@p['@st']",
             "Scope" or "sa" => "@p['@sa']",
             "Elapsed" => "_Elapsed(@st, @t)",
             "Arrived" or "Document" or "Data" => "undefined()",
diff --git a/src/Seq.Syntax/Expressions/BuiltInProperty.cs b/src/Seq.Syntax/Expressions/BuiltInProperty.cs
index ae8d502..4d569e5 100644
--- a/src/Seq.Syntax/Expressions/BuiltInProperty.cs
+++ b/src/Seq.Syntax/Expressions/BuiltInProperty.cs
@@ -25,4 +25,6 @@ static class BuiltInProperty
     public const string Properties = "p";
     public const string Renderings = "r";
     public const string EventId = "i";
+    public const string TraceId = "tr";
+    public const string SpanId = "sp";
 }
\ No newline at end of file
diff --git a/src/Seq.Syntax/Expressions/Compilation/Linq/LinqExpressionCompiler.cs b/src/Seq.Syntax/Expressions/Compilation/Linq/LinqExpressionCompiler.cs
index 442c8e2..6c229eb 100644
--- a/src/Seq.Syntax/Expressions/Compilation/Linq/LinqExpressionCompiler.cs
+++ b/src/Seq.Syntax/Expressions/Compilation/Linq/LinqExpressionCompiler.cs
@@ -219,6 +219,8 @@ protected override ExpressionBody Transform(AmbientNameExpression px)
                         null)),
                 BuiltInProperty.Renderings => Splice(context => Intrinsics.GetRenderings(context.LogEvent, formatProvider)),
                 BuiltInProperty.EventId => Splice(context => Intrinsics.GetEventId(context.LogEvent)),
+                BuiltInProperty.TraceId => Splice(context => new ScalarValue(context.LogEvent.TraceId)),
+                BuiltInProperty.SpanId => Splice(context => new ScalarValue(context.LogEvent.SpanId)),
                 var alias when _nameResolver.TryResolveBuiltInPropertyName(alias, out var target) =>
                     Transform(ExpressionCompiler.Translate(new ExpressionParser().Parse(target))),
                 _ => LX.Constant(null, typeof(LogEventPropertyValue))
diff --git a/src/Seq.Syntax/Seq.Syntax.csproj b/src/Seq.Syntax/Seq.Syntax.csproj
index 68ca324..bc35531 100644
--- a/src/Seq.Syntax/Seq.Syntax.csproj
+++ b/src/Seq.Syntax/Seq.Syntax.csproj
@@ -20,7 +20,7 @@
     <ItemGroup>
         <None Include="../../asset/seq-syntax.png" Pack="true" Visible="false" PackagePath="" />
         <PackageReference Include="Superpower" Version="3.0.0" />
-        <PackageReference Include="Serilog" Version="3.0.1" />
+        <PackageReference Include="Serilog" Version="3.1.1" />
     </ItemGroup>
     
 </Project>
diff --git a/test/Seq.Mail.Tests/Seq.Mail.Tests.csproj b/test/Seq.Mail.Tests/Seq.Mail.Tests.csproj
index 93e7fd5..70ac1a6 100644
--- a/test/Seq.Mail.Tests/Seq.Mail.Tests.csproj
+++ b/test/Seq.Mail.Tests/Seq.Mail.Tests.csproj
@@ -11,7 +11,7 @@
       <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
     </PackageReference>
     <PackageReference Include="xunit" Version="2.6.2" />
-    <PackageReference Include="Serilog.Formatting.Compact" Version="1.1.0" />
+    <PackageReference Include="Serilog.Formatting.Compact" Version="2.0.0" />
   </ItemGroup>
   <ItemGroup>
     <ProjectReference Include="..\..\src\Seq.App.Mail.Microsoft365\Seq.App.Mail.Microsoft365.csproj" />
diff --git a/test/Seq.Syntax.Tests/Seq.Syntax.Tests.csproj b/test/Seq.Syntax.Tests/Seq.Syntax.Tests.csproj
index 7067b9c..5e981ea 100644
--- a/test/Seq.Syntax.Tests/Seq.Syntax.Tests.csproj
+++ b/test/Seq.Syntax.Tests/Seq.Syntax.Tests.csproj
@@ -11,7 +11,7 @@
             <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
         </PackageReference>
         <PackageReference Include="xunit" Version="2.6.2" />
-        <PackageReference Include="Serilog.Formatting.Compact" Version="1.1.0" />
+        <PackageReference Include="Serilog.Formatting.Compact" Version="2.0.0" />
     </ItemGroup>
     <ItemGroup>
         <ProjectReference Include="..\..\src\Seq.Syntax\Seq.Syntax.csproj" />