diff --git a/BizHawk.Client.ApiHawk/BizHawk.Client.ApiHawk.csproj b/BizHawk.Client.ApiHawk/BizHawk.Client.ApiHawk.csproj
index e80de5d5ae..06dc0b4412 100644
--- a/BizHawk.Client.ApiHawk/BizHawk.Client.ApiHawk.csproj
+++ b/BizHawk.Client.ApiHawk/BizHawk.Client.ApiHawk.csproj
@@ -33,6 +33,7 @@
     <TargetFrameworkVersion>v4.6.1</TargetFrameworkVersion>
     <FileAlignment>512</FileAlignment>
     <TargetFrameworkProfile />
+    <LangVersion>8.0</LangVersion>
     <NoWarn>1591</NoWarn><!-- don't bug us with "Missing XML comment [...]" until we have and enforce .stylecop.json i.e. when we care -->
   </PropertyGroup>
   <ItemGroup>
diff --git a/BizHawk.Client.Common/BizHawk.Client.Common.csproj b/BizHawk.Client.Common/BizHawk.Client.Common.csproj
index de8ff5983c..23ee9e52b8 100644
--- a/BizHawk.Client.Common/BizHawk.Client.Common.csproj
+++ b/BizHawk.Client.Common/BizHawk.Client.Common.csproj
@@ -13,6 +13,7 @@
     <TargetFrameworkVersion>v4.6.1</TargetFrameworkVersion>
     <FileAlignment>512</FileAlignment>
     <TargetFrameworkProfile />
+    <LangVersion>8.0</LangVersion>
     <ResolveAssemblyWarnOrErrorOnTargetArchitectureMismatch>None</ResolveAssemblyWarnOrErrorOnTargetArchitectureMismatch>
   </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)' == 'Debug|AnyCPU'">
diff --git a/BizHawk.Client.DBMan/BizHawk.Client.DBMan.csproj b/BizHawk.Client.DBMan/BizHawk.Client.DBMan.csproj
index e65442660a..6d14eca92e 100644
--- a/BizHawk.Client.DBMan/BizHawk.Client.DBMan.csproj
+++ b/BizHawk.Client.DBMan/BizHawk.Client.DBMan.csproj
@@ -39,6 +39,7 @@
     <FileAlignment>512</FileAlignment>
     <TargetFrameworkProfile />
     <AutoGenerateBindingRedirects>true</AutoGenerateBindingRedirects>
+    <LangVersion>8.0</LangVersion>
   </PropertyGroup>
   <ItemGroup>
     <Reference Include="CSharp-SQLite">
diff --git a/BizHawk.Client.DiscoHawk/BizHawk.Client.DiscoHawk.csproj b/BizHawk.Client.DiscoHawk/BizHawk.Client.DiscoHawk.csproj
index 19809199c9..e45f56b5ce 100644
--- a/BizHawk.Client.DiscoHawk/BizHawk.Client.DiscoHawk.csproj
+++ b/BizHawk.Client.DiscoHawk/BizHawk.Client.DiscoHawk.csproj
@@ -32,6 +32,7 @@
     <UseApplicationTrust>false</UseApplicationTrust>
     <BootstrapperEnabled>true</BootstrapperEnabled>
     <TargetFrameworkProfile />
+    <LangVersion>8.0</LangVersion>
   </PropertyGroup>
   <PropertyGroup>
     <NoWin32Manifest>true</NoWin32Manifest>
diff --git a/BizHawk.Common/BizHawk.Common.csproj b/BizHawk.Common/BizHawk.Common.csproj
index 2a93d8a56f..4783b3c4e0 100644
--- a/BizHawk.Common/BizHawk.Common.csproj
+++ b/BizHawk.Common/BizHawk.Common.csproj
@@ -13,6 +13,7 @@
     <TargetFrameworkVersion>v4.6.1</TargetFrameworkVersion>
     <FileAlignment>512</FileAlignment>
     <TargetFrameworkProfile />
+    <LangVersion>8.0</LangVersion>
   </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)' == 'Debug|AnyCPU'">
     <DebugSymbols>true</DebugSymbols>
diff --git a/BizHawk.Emulation.Common/BizHawk.Emulation.Common.csproj b/BizHawk.Emulation.Common/BizHawk.Emulation.Common.csproj
index 7287faab8b..5dfecb7cfa 100644
--- a/BizHawk.Emulation.Common/BizHawk.Emulation.Common.csproj
+++ b/BizHawk.Emulation.Common/BizHawk.Emulation.Common.csproj
@@ -38,6 +38,7 @@
     <TargetFrameworkVersion>v4.6.1</TargetFrameworkVersion>
     <FileAlignment>512</FileAlignment>
     <TargetFrameworkProfile />
+    <LangVersion>8.0</LangVersion>
   </PropertyGroup>
   <ItemGroup>
     <Reference Include="Newtonsoft.Json, Version=6.0.0.0, Culture=neutral, processorArchitecture=MSIL">
diff --git a/BizHawk.Emulation.Cores/BizHawk.Emulation.Cores.csproj b/BizHawk.Emulation.Cores/BizHawk.Emulation.Cores.csproj
index f589bfa790..882192d4e9 100644
--- a/BizHawk.Emulation.Cores/BizHawk.Emulation.Cores.csproj
+++ b/BizHawk.Emulation.Cores/BizHawk.Emulation.Cores.csproj
@@ -32,6 +32,7 @@
     <UseApplicationTrust>false</UseApplicationTrust>
     <BootstrapperEnabled>true</BootstrapperEnabled>
     <TargetFrameworkProfile />
+    <LangVersion>8.0</LangVersion>
   </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)' == 'Debug|AnyCPU'">
     <DebugSymbols>true</DebugSymbols>
diff --git a/BizHawk.Emulation.DiscSystem/BizHawk.Emulation.DiscSystem.csproj b/BizHawk.Emulation.DiscSystem/BizHawk.Emulation.DiscSystem.csproj
index deb41e4f0d..53c1fa2faa 100644
--- a/BizHawk.Emulation.DiscSystem/BizHawk.Emulation.DiscSystem.csproj
+++ b/BizHawk.Emulation.DiscSystem/BizHawk.Emulation.DiscSystem.csproj
@@ -38,6 +38,7 @@
     <TargetFrameworkVersion>v4.6.1</TargetFrameworkVersion>
     <FileAlignment>512</FileAlignment>
     <TargetFrameworkProfile />
+    <LangVersion>8.0</LangVersion>
   </PropertyGroup>
   <ItemGroup>
     <Reference Include="System" />
diff --git a/Bizware/BizHawk.Bizware.BizwareGL.GdiPlus/BizHawk.Bizware.BizwareGL.GdiPlus.csproj b/Bizware/BizHawk.Bizware.BizwareGL.GdiPlus/BizHawk.Bizware.BizwareGL.GdiPlus.csproj
index d672923fe1..0e72db75f6 100644
--- a/Bizware/BizHawk.Bizware.BizwareGL.GdiPlus/BizHawk.Bizware.BizwareGL.GdiPlus.csproj
+++ b/Bizware/BizHawk.Bizware.BizwareGL.GdiPlus/BizHawk.Bizware.BizwareGL.GdiPlus.csproj
@@ -13,6 +13,7 @@
     <TargetFrameworkVersion>v4.6.1</TargetFrameworkVersion>
     <FileAlignment>512</FileAlignment>
     <TargetFrameworkProfile />
+    <LangVersion>8.0</LangVersion>
   </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)' == 'Debug|AnyCPU'">
     <DebugSymbols>true</DebugSymbols>
diff --git a/Bizware/BizHawk.Bizware.BizwareGL.OpenTK/BizHawk.Bizware.BizwareGL.OpenTK.csproj b/Bizware/BizHawk.Bizware.BizwareGL.OpenTK/BizHawk.Bizware.BizwareGL.OpenTK.csproj
index 2f55beb615..f5eb241bec 100644
--- a/Bizware/BizHawk.Bizware.BizwareGL.OpenTK/BizHawk.Bizware.BizwareGL.OpenTK.csproj
+++ b/Bizware/BizHawk.Bizware.BizwareGL.OpenTK/BizHawk.Bizware.BizwareGL.OpenTK.csproj
@@ -13,6 +13,7 @@
     <TargetFrameworkVersion>v4.6.1</TargetFrameworkVersion>
     <FileAlignment>512</FileAlignment>
     <TargetFrameworkProfile />
+    <LangVersion>8.0</LangVersion>
   </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)' == 'Debug|AnyCPU'">
     <DebugSymbols>true</DebugSymbols>
diff --git a/Bizware/BizHawk.Bizware.BizwareGL.SlimDX/BizHawk.Bizware.BizwareGL.SlimDX.csproj b/Bizware/BizHawk.Bizware.BizwareGL.SlimDX/BizHawk.Bizware.BizwareGL.SlimDX.csproj
index cf7d477acb..0da773623b 100644
--- a/Bizware/BizHawk.Bizware.BizwareGL.SlimDX/BizHawk.Bizware.BizwareGL.SlimDX.csproj
+++ b/Bizware/BizHawk.Bizware.BizwareGL.SlimDX/BizHawk.Bizware.BizwareGL.SlimDX.csproj
@@ -13,6 +13,7 @@
     <TargetFrameworkVersion>v4.6.1</TargetFrameworkVersion>
     <FileAlignment>512</FileAlignment>
     <TargetFrameworkProfile />
+    <LangVersion>8.0</LangVersion>
   </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)' == 'Debug|AnyCPU'">
     <DebugSymbols>true</DebugSymbols>
diff --git a/Bizware/BizHawk.Bizware.BizwareGL/BizHawk.Bizware.BizwareGL.csproj b/Bizware/BizHawk.Bizware.BizwareGL/BizHawk.Bizware.BizwareGL.csproj
index 91d0f9902d..bf7f208770 100644
--- a/Bizware/BizHawk.Bizware.BizwareGL/BizHawk.Bizware.BizwareGL.csproj
+++ b/Bizware/BizHawk.Bizware.BizwareGL/BizHawk.Bizware.BizwareGL.csproj
@@ -13,6 +13,7 @@
     <TargetFrameworkVersion>v4.6.1</TargetFrameworkVersion>
     <FileAlignment>512</FileAlignment>
     <TargetFrameworkProfile />
+    <LangVersion>8.0</LangVersion>
   </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)' == 'Debug|AnyCPU'">
     <DebugSymbols>true</DebugSymbols>
diff --git a/Version/Version.csproj b/Version/Version.csproj
index 85cf67cfdb..a09fa674e8 100644
--- a/Version/Version.csproj
+++ b/Version/Version.csproj
@@ -15,6 +15,7 @@
     <TargetFrameworkVersion>v4.6.1</TargetFrameworkVersion>
     <FileAlignment>512</FileAlignment>
     <TargetFrameworkProfile />
+    <LangVersion>8.0</LangVersion>
   </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)' == 'Debug|AnyCPU'">
     <DebugSymbols>true</DebugSymbols>