diff --git a/src/Argon.DataSets/Argon.DataSets.csproj b/src/Argon.DataSets/Argon.DataSets.csproj
index 1a0bed32..8f54702e 100644
--- a/src/Argon.DataSets/Argon.DataSets.csproj
+++ b/src/Argon.DataSets/Argon.DataSets.csproj
@@ -4,6 +4,7 @@
   </PropertyGroup>
   <ItemGroup>
     <PackageReference Include="ProjectDefaults" PrivateAssets="all" />
+    <PackageReference Include="Squash" PrivateAssets="all" />
     <ProjectReference Include="..\Argon\Argon.csproj" />
   </ItemGroup>
 </Project>
\ No newline at end of file
diff --git a/src/Argon.FSharp/Argon.FSharp.csproj b/src/Argon.FSharp/Argon.FSharp.csproj
index 4bed808f..d2778119 100644
--- a/src/Argon.FSharp/Argon.FSharp.csproj
+++ b/src/Argon.FSharp/Argon.FSharp.csproj
@@ -10,6 +10,7 @@
     <Using Include="Microsoft.FSharp.Collections" />
     <PackageReference Include="FSharp.Core" />
     <PackageReference Include="ProjectDefaults" PrivateAssets="all" />
+    <PackageReference Include="Squash" PrivateAssets="all" />
     <ProjectReference Include="..\Argon\Argon.csproj" />
   </ItemGroup>
 
diff --git a/src/Argon.InterfaceCallbacks/Argon.InterfaceCallbacks.csproj b/src/Argon.InterfaceCallbacks/Argon.InterfaceCallbacks.csproj
index 1a0bed32..8f54702e 100644
--- a/src/Argon.InterfaceCallbacks/Argon.InterfaceCallbacks.csproj
+++ b/src/Argon.InterfaceCallbacks/Argon.InterfaceCallbacks.csproj
@@ -4,6 +4,7 @@
   </PropertyGroup>
   <ItemGroup>
     <PackageReference Include="ProjectDefaults" PrivateAssets="all" />
+    <PackageReference Include="Squash" PrivateAssets="all" />
     <ProjectReference Include="..\Argon\Argon.csproj" />
   </ItemGroup>
 </Project>
\ No newline at end of file
diff --git a/src/Argon.JsonPath/Argon.JsonPath.csproj b/src/Argon.JsonPath/Argon.JsonPath.csproj
index 1a0bed32..456f26f1 100644
--- a/src/Argon.JsonPath/Argon.JsonPath.csproj
+++ b/src/Argon.JsonPath/Argon.JsonPath.csproj
@@ -1,9 +1,12 @@
 <Project Sdk="Microsoft.NET.Sdk">
   <PropertyGroup>
     <TargetFrameworks>net472;net48;net6.0;net7.0;net8.0;net9.0;net10.0;net11.0</TargetFrameworks>
+    <!-- The tests use internals through InternalsVisibleTo -->
+    <SquashInternalsVisibleTo>Honor</SquashInternalsVisibleTo>
   </PropertyGroup>
   <ItemGroup>
     <PackageReference Include="ProjectDefaults" PrivateAssets="all" />
+    <PackageReference Include="Squash" PrivateAssets="all" />
     <ProjectReference Include="..\Argon\Argon.csproj" />
   </ItemGroup>
 </Project>
\ No newline at end of file
diff --git a/src/Argon.NodaTime/Argon.NodaTime.csproj b/src/Argon.NodaTime/Argon.NodaTime.csproj
index 89f398a3..82ab047e 100644
--- a/src/Argon.NodaTime/Argon.NodaTime.csproj
+++ b/src/Argon.NodaTime/Argon.NodaTime.csproj
@@ -3,12 +3,15 @@
   <PropertyGroup>
     <Description>Provides serialization support between Noda Time and Json.NET.</Description>
     <TargetFrameworks>net48;net6.0;net7.0;net8.0;net9.0;net10.0;net11.0</TargetFrameworks>
+    <!-- The tests use internals through InternalsVisibleTo -->
+    <SquashInternalsVisibleTo>Honor</SquashInternalsVisibleTo>
     <PackageTags>nodatime;json;Argon</PackageTags>
   </PropertyGroup>
   <ItemGroup>
     <SupportedPlatform Include="browser" />
     <PackageReference Include="NodaTime" />
     <PackageReference Include="ProjectDefaults" PrivateAssets="all" />
+    <PackageReference Include="Squash" PrivateAssets="all" />
     <ProjectReference Include="..\Argon\Argon.csproj" />
   </ItemGroup>
 
diff --git a/src/Argon.Xml/Argon.Xml.csproj b/src/Argon.Xml/Argon.Xml.csproj
index 1a0bed32..8f54702e 100644
--- a/src/Argon.Xml/Argon.Xml.csproj
+++ b/src/Argon.Xml/Argon.Xml.csproj
@@ -4,6 +4,7 @@
   </PropertyGroup>
   <ItemGroup>
     <PackageReference Include="ProjectDefaults" PrivateAssets="all" />
+    <PackageReference Include="Squash" PrivateAssets="all" />
     <ProjectReference Include="..\Argon\Argon.csproj" />
   </ItemGroup>
 </Project>
\ No newline at end of file
diff --git a/src/Argon/Argon.csproj b/src/Argon/Argon.csproj
index 9b681ed4..bdb4f7ac 100644
--- a/src/Argon/Argon.csproj
+++ b/src/Argon/Argon.csproj
@@ -2,10 +2,13 @@
   <PropertyGroup>
     <TargetFrameworks>net462;net472;net48;net6.0;net7.0;net8.0;net9.0;net10.0;net11.0</TargetFrameworks>
     <PolyNullability>true</PolyNullability>
+    <!-- The other Argon libraries and the tests use internals through InternalsVisibleTo -->
+    <SquashInternalsVisibleTo>Honor</SquashInternalsVisibleTo>
     <IsAotCompatible Condition="$([MSBuild]::IsTargetFrameworkCompatible('$(TargetFramework)', 'net7.0'))">true</IsAotCompatible>
   </PropertyGroup>
   <ItemGroup>
     <PackageReference Include="ProjectDefaults" PrivateAssets="all" />
+    <PackageReference Include="Squash" PrivateAssets="all" />
     <PackageReference Include="Polyfill" PrivateAssets="all" />
     <PackageReference Include="Sbom" PrivateAssets="all" />
     <PackageReference Include="System.ValueTuple" Condition="'$(TargetFramework)' == 'net462'" />
diff --git a/src/Directory.Build.props b/src/Directory.Build.props
index 5399e048..31731b35 100644
--- a/src/Directory.Build.props
+++ b/src/Directory.Build.props
@@ -1,8 +1,10 @@
 <Project>
   <PropertyGroup>
-    <NoWarn>CS1591;CS1573;NU1605;NU1608;NU1109</NoWarn>
+    <!-- The IL codes are linker warnings from Squash, for reflection the trim analyzer
+         already checks at compile time, where the source suppresses it. -->
+    <NoWarn>CS1591;CS1573;NU1605;NU1608;NU1109;IL2026;IL2060;IL2067;IL2070;IL2072;IL2121</NoWarn>
     <LangVersion>preview</LangVersion>
-    <Version>0.38.0</Version>
+    <Version>0.38.1</Version>
     <AssemblyVersion>1.0.0</AssemblyVersion>
     <Copyright>Copyright © James Newton-King 2008, Copyright © Simon Cropp 2022</Copyright>
     <PackageTags>Json</PackageTags>
diff --git a/src/Directory.Packages.props b/src/Directory.Packages.props
index ce4adfc3..c754c19a 100644
--- a/src/Directory.Packages.props
+++ b/src/Directory.Packages.props
@@ -12,6 +12,7 @@
     <PackageVersion Include="NodaTime" Version="3.3.5" />
     <PackageVersion Include="Polyfill" Version="11.4.3" />
     <PackageVersion Include="ProjectDefaults" Version="1.0.184" />
+    <PackageVersion Include="Squash" Version="0.1.0-beta.2" />
     <PackageVersion Include="ProjectFiles" Version="1.6.0" />
     <PackageVersion Include="Sbom" Version="0.3.1" />
     <PackageVersion Include="System.ValueTuple" Version="4.5.0" Pinned="true" />