diff --git a/ortools/dotnet/Sample.csproj.in b/ortools/dotnet/Sample.csproj.in
index a7dd3676b4..f6ba1aa8f5 100644
--- a/ortools/dotnet/Sample.csproj.in
+++ b/ortools/dotnet/Sample.csproj.in
@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
   <PropertyGroup>
     <OutputType>Exe</OutputType>
-    <LangVersion>7.3</LangVersion>
+    <LangVersion>8.0</LangVersion>
     <TargetFramework>netcoreapp3.1</TargetFramework>
     <EnableDefaultItems>false</EnableDefaultItems>
     <EnableDefaultCompileItems>false</EnableDefaultCompileItems>
diff --git a/ortools/dotnet/Test.csproj.in b/ortools/dotnet/Test.csproj.in
index 55d77788ad..50ec450367 100644
--- a/ortools/dotnet/Test.csproj.in
+++ b/ortools/dotnet/Test.csproj.in
@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
   <PropertyGroup>
     <OutputType>Exe</OutputType>
-    <LangVersion>7.3</LangVersion>
+    <LangVersion>8.0</LangVersion>
     <TargetFramework>netcoreapp3.1</TargetFramework>
     <EnableDefaultItems>false</EnableDefaultItems>
     <EnableDefaultCompileItems>false</EnableDefaultCompileItems>