diff --git a/tests/SixLabors.Core.Tests/SixLabors.Core.Tests.csproj b/tests/SixLabors.Core.Tests/SixLabors.Core.Tests.csproj
index f1b5839fc..55951fb43 100644
--- a/tests/SixLabors.Core.Tests/SixLabors.Core.Tests.csproj
+++ b/tests/SixLabors.Core.Tests/SixLabors.Core.Tests.csproj
@@ -15,6 +15,7 @@
     <DebugType Condition="$(codecov) != ''">full</DebugType>
     <RootNamespace>SixLabors.Tests</RootNamespace>
     <AllowUnsafeBlocks>true</AllowUnsafeBlocks>
+    <LangVersion>7.3</LangVersion>
   </PropertyGroup>
 
   <PropertyGroup>