diff --git a/src/SeqCli/Apps/AppLoader.cs b/src/SeqCli/Apps/AppLoader.cs
index 0027a16b..90872ef2 100644
--- a/src/SeqCli/Apps/AppLoader.cs
+++ b/src/SeqCli/Apps/AppLoader.cs
@@ -19,6 +19,7 @@
 using System.Linq;
 using System.Reflection;
 using Seq.Apps;
+using Seq.Syntax.Expressions;
 using Serilog;
 
 namespace SeqCli.Apps;
@@ -30,10 +31,11 @@ class AppLoader : IDisposable
     // These are used for interop between the host process and the app. The
     // app _must_ be able to load on the unified version.
     readonly Assembly[] _contracts =
-    {
+    [
         typeof(SeqApp).Assembly,
         typeof(Log).Assembly,
-    };
+        typeof(SerilogExpression).Assembly
+    ];
         
     public AppLoader(string packageBinaryPath)
     {
diff --git a/src/SeqCli/Cli/Commands/IngestCommand.cs b/src/SeqCli/Cli/Commands/IngestCommand.cs
index d591ba52..2d5ffce8 100644
--- a/src/SeqCli/Cli/Commands/IngestCommand.cs
+++ b/src/SeqCli/Cli/Commands/IngestCommand.cs
@@ -24,7 +24,6 @@
 using Serilog;
 using Serilog.Core;
 using Serilog.Events;
-using Serilog.Expressions;
 
 namespace SeqCli.Cli.Commands;
 
@@ -95,7 +94,7 @@ protected override async Task<int> Run()
             if (_filter != null)
             {
                 var eval = SeqSyntax.CompileExpression(_filter);
-                filter = evt => ExpressionResult.IsTrue(eval(evt));
+                filter = evt => Seq.Syntax.Expressions.ExpressionResult.IsTrue(eval(evt));
             }
 
             var connection = _connectionFactory.Connect(_connection);
diff --git a/src/SeqCli/Cli/Commands/PrintCommand.cs b/src/SeqCli/Cli/Commands/PrintCommand.cs
index 698875a2..a5d24dda 100644
--- a/src/SeqCli/Cli/Commands/PrintCommand.cs
+++ b/src/SeqCli/Cli/Commands/PrintCommand.cs
@@ -16,6 +16,7 @@
 using System.IO;
 using System.Threading.Tasks;
 using Newtonsoft.Json;
+using Seq.Syntax.Expressions;
 using SeqCli.Cli.Features;
 using SeqCli.Config;
 using SeqCli.Ingestion;
@@ -81,7 +82,15 @@ var theme
                 applyThemeToRedirectedOutput: applyThemeToRedirectedOutput);
 
         if (_filter != null)
-            outputConfiguration.Filter.ByIncludingOnly(_filter);
+        {
+            if (!SerilogExpression.TryCompile(_filter, out var filter, out var error))
+            {
+                Log.Error("The specified filter could not be compiled: {Error}", error);
+                return 1;
+            }
+            
+            outputConfiguration.Filter.ByIncludingOnly(evt => ExpressionResult.IsTrue(filter(evt)));
+        }
 
         await using var logger = outputConfiguration.CreateLogger();
         foreach (var input in _fileInputFeature.OpenInputs())
diff --git a/src/SeqCli/Output/OutputFormatter.cs b/src/SeqCli/Output/OutputFormatter.cs
index ccd14db9..8d55ac4c 100644
--- a/src/SeqCli/Output/OutputFormatter.cs
+++ b/src/SeqCli/Output/OutputFormatter.cs
@@ -7,6 +7,9 @@ namespace SeqCli.Output;
 
 static class OutputFormatter
 {
+    // This is the only usage of Serilog.Expressions remaining in seqcli; the upstream Seq.Syntax doesn't yet support
+    // the `@sp` property, because it needs to load on older Seq installs with older Serilog versions embedded in the
+    // app runner. Once we've updated it, we can switch this to a Seq.Syntax template.
     internal static readonly ITextFormatter Json = new ExpressionTemplate(
         $"{{ {{@t, @mt, @l: coalesce({LevelMapping.SurrogateLevelProperty}, if @l = 'Information' then undefined() else @l), @x, @sp, @tr, @ps: coalesce({TraceConstants.ParentSpanIdProperty}, @ps), @st: coalesce({TraceConstants.SpanStartTimestampProperty}, @st), ..rest()}} }}\n"
     );
diff --git a/src/SeqCli/SeqCli.csproj b/src/SeqCli/SeqCli.csproj
index b5bcd69e..0ee292ec 100644
--- a/src/SeqCli/SeqCli.csproj
+++ b/src/SeqCli/SeqCli.csproj
@@ -29,7 +29,7 @@
     <PackageReference Include="Destructurama.JsonNet" Version="2.0.1" />
     <PackageReference Include="newtonsoft.json" Version="13.0.3" />
     <PackageReference Include="Serilog" Version="3.1.1" />
-    <PackageReference Include="serilog.expressions" Version="4.0.0" />
+    <PackageReference Include="Serilog.Expressions" Version="4.0.0" />
     <PackageReference Include="Serilog.Formatting.Compact" Version="2.0.0" />
     <PackageReference Include="Serilog.Formatting.Compact.Reader" Version="3.0.0" />
     <PackageReference Include="Serilog.Sinks.Console" Version="5.0.1" />
diff --git a/src/SeqCli/Syntax/SeqCliNameResolver.cs b/src/SeqCli/Syntax/SeqCliNameResolver.cs
new file mode 100644
index 00000000..91b4abab
--- /dev/null
+++ b/src/SeqCli/Syntax/SeqCliNameResolver.cs
@@ -0,0 +1,20 @@
+using System.Diagnostics.CodeAnalysis;
+using Seq.Syntax.Expressions;
+
+namespace SeqCli.Syntax;
+
+class SeqCliNameResolver: NameResolver
+{
+    public override bool TryResolveBuiltInPropertyName(string alias, [MaybeNullWhen(false)] out string target)
+    {
+        switch (alias)
+        {
+            case "@l":
+                target = "coalesce(SeqCliOriginalLevel, @l)";
+                return true;
+            default:
+                target = null;
+                return false;
+        }
+    }
+}
diff --git a/src/SeqCli/Syntax/SeqSyntax.cs b/src/SeqCli/Syntax/SeqSyntax.cs
index c46642ab..3974b4ad 100644
--- a/src/SeqCli/Syntax/SeqSyntax.cs
+++ b/src/SeqCli/Syntax/SeqSyntax.cs
@@ -1,5 +1,4 @@
-using System.Diagnostics.CodeAnalysis;
-using Seq.Syntax.Expressions;
+using Seq.Syntax.Expressions;
 
 namespace SeqCli.Syntax;
 
@@ -9,20 +8,4 @@ public static CompiledExpression CompileExpression(string expression)
     {
         return SerilogExpression.Compile(expression, nameResolver: new SeqCliNameResolver());
     }
-}
-
-class SeqCliNameResolver: NameResolver
-{
-    public override bool TryResolveBuiltInPropertyName(string alias, [MaybeNullWhen(false)] out string target)
-    {
-        switch (alias)
-        {
-            case "@l":
-                target = "coalesce(SeqCliOriginalLevel, @l)";
-                return true;
-            default:
-                target = null;
-                return false;
-        }
-    }
-}
+}
\ No newline at end of file