diff --git a/Dalamud.CorePlugin/Dalamud.CorePlugin.csproj b/Dalamud.CorePlugin/Dalamud.CorePlugin.csproj
index cf1b73d5a..5f4f5560c 100644
--- a/Dalamud.CorePlugin/Dalamud.CorePlugin.csproj
+++ b/Dalamud.CorePlugin/Dalamud.CorePlugin.csproj
@@ -3,7 +3,7 @@
         <AssemblyName>Dalamud.CorePlugin</AssemblyName>
         <TargetFramework>net5.0-windows</TargetFramework>
         <Platforms>x64</Platforms>
-        <LangVersion>10.0</LangVersion>
+        <LangVersion>9.0</LangVersion>
         <AllowUnsafeBlocks>true</AllowUnsafeBlocks>
         <ProduceReferenceAssembly>false</ProduceReferenceAssembly>
         <AppendTargetFrameworkToOutputPath>false</AppendTargetFrameworkToOutputPath>
diff --git a/Dalamud.Injector/Dalamud.Injector.csproj b/Dalamud.Injector/Dalamud.Injector.csproj
index dbe4c94da..d9ce042a6 100644
--- a/Dalamud.Injector/Dalamud.Injector.csproj
+++ b/Dalamud.Injector/Dalamud.Injector.csproj
@@ -5,7 +5,7 @@
         <RuntimeIdentifier>win-x64</RuntimeIdentifier>
         <PlatformTarget>x64</PlatformTarget>
         <Platforms>x64;AnyCPU</Platforms>
-        <LangVersion>10.0</LangVersion>
+        <LangVersion>9.0</LangVersion>
     </PropertyGroup>
 
     <PropertyGroup Label="Feature">
diff --git a/Dalamud/Dalamud.csproj b/Dalamud/Dalamud.csproj
index d0042ddf2..34be2de49 100644
--- a/Dalamud/Dalamud.csproj
+++ b/Dalamud/Dalamud.csproj
@@ -4,7 +4,7 @@
         <TargetFramework>net5.0-windows</TargetFramework>
         <PlatformTarget>x64</PlatformTarget>
         <Platforms>x64;AnyCPU</Platforms>
-        <LangVersion>10.0</LangVersion>
+        <LangVersion>9.0</LangVersion>
     </PropertyGroup>
 
     <PropertyGroup Label="Feature">