diff --git a/Sources/BowlingApi/BowlingApi.csproj b/Sources/BowlingApi/BowlingApi.csproj
index 2b76c0b..7f0352f 100644
--- a/Sources/BowlingApi/BowlingApi.csproj
+++ b/Sources/BowlingApi/BowlingApi.csproj
@@ -4,7 +4,7 @@
         <TargetFramework>net6.0</TargetFramework>
         <Nullable>enable</Nullable>
         <ImplicitUsings>enable</ImplicitUsings>
-        <LangVersion>11</LangVersion>
+        <LangVersion>10</LangVersion>
     </PropertyGroup>
 
     <PropertyGroup Condition=" '$(RunConfiguration)' == 'https' " />