diff --git a/src/ImageSharp/ImageSharp.csproj b/src/ImageSharp/ImageSharp.csproj
index 6ad20713d..800b69326 100644
--- a/src/ImageSharp/ImageSharp.csproj
+++ b/src/ImageSharp/ImageSharp.csproj
@@ -39,6 +39,7 @@
     <Otherwise>
       <PropertyGroup>
         <TargetFrameworks>netcoreapp3.1;netcoreapp2.1;netstandard2.1;netstandard2.0;netstandard1.3;net472</TargetFrameworks>
+        <LangVersion>9.0</LangVersion>
       </PropertyGroup>
     </Otherwise>
   </Choose>
diff --git a/tests/ImageSharp.Benchmarks/ImageSharp.Benchmarks.csproj b/tests/ImageSharp.Benchmarks/ImageSharp.Benchmarks.csproj
index 8f0b4a86f..4d7af89a5 100644
--- a/tests/ImageSharp.Benchmarks/ImageSharp.Benchmarks.csproj
+++ b/tests/ImageSharp.Benchmarks/ImageSharp.Benchmarks.csproj
@@ -28,6 +28,7 @@
     <Otherwise>
       <PropertyGroup>
         <TargetFrameworks>net5.0;netcoreapp3.1;netcoreapp2.1;net472</TargetFrameworks>
+        <LangVersion>9.0</LangVersion>
       </PropertyGroup>
     </Otherwise>
   </Choose>
diff --git a/tests/ImageSharp.Tests.ProfilingSandbox/ImageSharp.Tests.ProfilingSandbox.csproj b/tests/ImageSharp.Tests.ProfilingSandbox/ImageSharp.Tests.ProfilingSandbox.csproj
index 1a470fa31..a141a58b0 100644
--- a/tests/ImageSharp.Tests.ProfilingSandbox/ImageSharp.Tests.ProfilingSandbox.csproj
+++ b/tests/ImageSharp.Tests.ProfilingSandbox/ImageSharp.Tests.ProfilingSandbox.csproj
@@ -30,6 +30,7 @@
     <Otherwise>
       <PropertyGroup>
         <TargetFrameworks>net5.0;netcoreapp3.1;netcoreapp2.1;net472</TargetFrameworks>
+        <LangVersion>9.0</LangVersion>
       </PropertyGroup>
     </Otherwise>
   </Choose>
diff --git a/tests/ImageSharp.Tests/ImageSharp.Tests.csproj b/tests/ImageSharp.Tests/ImageSharp.Tests.csproj
index 471287006..c560b1b78 100644
--- a/tests/ImageSharp.Tests/ImageSharp.Tests.csproj
+++ b/tests/ImageSharp.Tests/ImageSharp.Tests.csproj
@@ -23,6 +23,7 @@
     <Otherwise>
       <PropertyGroup>
         <TargetFrameworks>net5.0;netcoreapp3.1;netcoreapp2.1;net472</TargetFrameworks>
+        <LangVersion>9.0</LangVersion>
       </PropertyGroup>
     </Otherwise>
   </Choose>