diff --git a/eng/Versions.props b/eng/Versions.props
index aabdb79ba5a..17251aa96b6 100644
--- a/eng/Versions.props
+++ b/eng/Versions.props
@@ -11,7 +11,7 @@
     <MicrosoftNETILLinkPackageVersion>10.0.0-rc.1.25555.107</MicrosoftNETILLinkPackageVersion>
     <SystemThreadingChannelsPackageVersion>10.0.0-rc.1.25555.107</SystemThreadingChannelsPackageVersion>
     <MicrosoftExtensionsLoggingPackageVersion>10.0.0-rc.1.25555.107</MicrosoftExtensionsLoggingPackageVersion>
-    <BenchmarkDotNetVersion>0.14.1-nightly.20250107.205</BenchmarkDotNetVersion>
+    <BenchmarkDotNetVersion>0.16.0-custom.20260120.101</BenchmarkDotNetVersion>
     <MicrosoftNETRuntimeEmscripten3156Nodewinx64Version>10.0.0-rc.1.25555.107</MicrosoftNETRuntimeEmscripten3156Nodewinx64Version>
     <MicrosoftDotNetXHarnessCLIVersion>11.0.0-prerelease.25603.1</MicrosoftDotNetXHarnessCLIVersion>
   </PropertyGroup>
diff --git a/src/benchmarks/micro/MicroBenchmarks.csproj b/src/benchmarks/micro/MicroBenchmarks.csproj
index 4bf23cd37f2..8417af86f4e 100644
--- a/src/benchmarks/micro/MicroBenchmarks.csproj
+++ b/src/benchmarks/micro/MicroBenchmarks.csproj
@@ -18,7 +18,7 @@
     <DebugSymbols>true</DebugSymbols>
     <AllowUnsafeBlocks>true</AllowUnsafeBlocks>
     <EnableXlfLocalization>false</EnableXlfLocalization>
-    <LangVersion>latest</LangVersion>
+    <LangVersion>preview</LangVersion>
 
     <!-- Allow building with one major version, and running using a sdk with a higher major version -->
     <RollForward Condition="'$(BuildingForWasm)' == 'true'">LatestMajor</RollForward>
diff --git a/src/benchmarks/real-world/PowerShell.Benchmarks/PowerShell.Benchmarks.csproj b/src/benchmarks/real-world/PowerShell.Benchmarks/PowerShell.Benchmarks.csproj
index 9d9d5e0cc72..cad0d7f78ef 100644
--- a/src/benchmarks/real-world/PowerShell.Benchmarks/PowerShell.Benchmarks.csproj
+++ b/src/benchmarks/real-world/PowerShell.Benchmarks/PowerShell.Benchmarks.csproj
@@ -7,6 +7,7 @@
     <ImplicitUsings>enable</ImplicitUsings>
     <AllowUnsafeBlocks>true</AllowUnsafeBlocks>
     <StartArguments>--filter *</StartArguments>
+    <LangVersion>preview</LangVersion>
   </PropertyGroup>
 
   <ItemGroup>
diff --git a/src/benchmarks/real-world/Roslyn/CompilerBenchmarks.csproj b/src/benchmarks/real-world/Roslyn/CompilerBenchmarks.csproj
index efea4e38a4a..5dc0cc61c21 100644
--- a/src/benchmarks/real-world/Roslyn/CompilerBenchmarks.csproj
+++ b/src/benchmarks/real-world/Roslyn/CompilerBenchmarks.csproj
@@ -15,7 +15,7 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="Microsoft.CodeAnalysis.CSharp" Version="4.12.0" />
+    <PackageReference Include="Microsoft.CodeAnalysis.CSharp" Version="5.0.0" />
   </ItemGroup>
 
   <ItemGroup>