diff --git a/osu.Desktop.Deploy/osu.Desktop.Deploy.csproj b/osu.Desktop.Deploy/osu.Desktop.Deploy.csproj
index 901117b026..1f9726b573 100644
--- a/osu.Desktop.Deploy/osu.Desktop.Deploy.csproj
+++ b/osu.Desktop.Deploy/osu.Desktop.Deploy.csproj
@@ -22,6 +22,7 @@
     <DefineConstants>DEBUG;TRACE</DefineConstants>
     <ErrorReport>prompt</ErrorReport>
     <WarningLevel>4</WarningLevel>
+    <LangVersion>6</LangVersion>
   </PropertyGroup>
   <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Release|AnyCPU' ">
     <PlatformTarget>AnyCPU</PlatformTarget>
diff --git a/osu.Desktop.Tests/osu.Desktop.Tests.csproj b/osu.Desktop.Tests/osu.Desktop.Tests.csproj
index ccb979afaa..8afd632bd1 100644
--- a/osu.Desktop.Tests/osu.Desktop.Tests.csproj
+++ b/osu.Desktop.Tests/osu.Desktop.Tests.csproj
@@ -21,6 +21,7 @@
     <ErrorReport>prompt</ErrorReport>
     <WarningLevel>4</WarningLevel>
     <TreatWarningsAsErrors>false</TreatWarningsAsErrors>
+    <LangVersion>6</LangVersion>
   </PropertyGroup>
   <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Release|AnyCPU' ">
     <DebugType>pdbonly</DebugType>
diff --git a/osu.Desktop.VisualTests/osu.Desktop.VisualTests.csproj b/osu.Desktop.VisualTests/osu.Desktop.VisualTests.csproj
index d75bb94308..4fc0a93fb4 100644
--- a/osu.Desktop.VisualTests/osu.Desktop.VisualTests.csproj
+++ b/osu.Desktop.VisualTests/osu.Desktop.VisualTests.csproj
@@ -61,6 +61,7 @@
     <RunCodeAnalysis>false</RunCodeAnalysis>
     <Prefer32Bit>false</Prefer32Bit>
     <TreatWarningsAsErrors>false</TreatWarningsAsErrors>
+    <LangVersion>6</LangVersion>
   </PropertyGroup>
   <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Release|AnyCPU' ">
     <DebugType>none</DebugType>
diff --git a/osu.Desktop/osu.Desktop.csproj b/osu.Desktop/osu.Desktop.csproj
index dbd26b4640..553dff6c6f 100644
--- a/osu.Desktop/osu.Desktop.csproj
+++ b/osu.Desktop/osu.Desktop.csproj
@@ -63,6 +63,7 @@
     <TreatWarningsAsErrors>false</TreatWarningsAsErrors>
     <Commandlineparameters>
     </Commandlineparameters>
+    <LangVersion>6</LangVersion>
   </PropertyGroup>
   <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Release|AnyCPU' ">
     <DebugType>none</DebugType>
diff --git a/osu.Game.Modes.Catch/osu.Game.Modes.Catch.csproj b/osu.Game.Modes.Catch/osu.Game.Modes.Catch.csproj
index 50b1a095af..b3e847a5be 100644
--- a/osu.Game.Modes.Catch/osu.Game.Modes.Catch.csproj
+++ b/osu.Game.Modes.Catch/osu.Game.Modes.Catch.csproj
@@ -21,6 +21,7 @@
     <ErrorReport>prompt</ErrorReport>
     <WarningLevel>4</WarningLevel>
     <TreatWarningsAsErrors>false</TreatWarningsAsErrors>
+    <LangVersion>6</LangVersion>
   </PropertyGroup>
   <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Release|AnyCPU' ">
     <DebugType>pdbonly</DebugType>
diff --git a/osu.Game.Modes.Mania/osu.Game.Modes.Mania.csproj b/osu.Game.Modes.Mania/osu.Game.Modes.Mania.csproj
index 896e9c68c6..6c666fd6ea 100644
--- a/osu.Game.Modes.Mania/osu.Game.Modes.Mania.csproj
+++ b/osu.Game.Modes.Mania/osu.Game.Modes.Mania.csproj
@@ -21,6 +21,7 @@
     <ErrorReport>prompt</ErrorReport>
     <WarningLevel>4</WarningLevel>
     <TreatWarningsAsErrors>false</TreatWarningsAsErrors>
+    <LangVersion>6</LangVersion>
   </PropertyGroup>
   <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Release|AnyCPU' ">
     <DebugType>pdbonly</DebugType>
diff --git a/osu.Game.Modes.Osu/osu.Game.Modes.Osu.csproj b/osu.Game.Modes.Osu/osu.Game.Modes.Osu.csproj
index 21f0f03d8c..c98f554ba5 100644
--- a/osu.Game.Modes.Osu/osu.Game.Modes.Osu.csproj
+++ b/osu.Game.Modes.Osu/osu.Game.Modes.Osu.csproj
@@ -22,6 +22,7 @@
     <ErrorReport>prompt</ErrorReport>
     <WarningLevel>4</WarningLevel>
     <TreatWarningsAsErrors>false</TreatWarningsAsErrors>
+    <LangVersion>6</LangVersion>
   </PropertyGroup>
   <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Release|AnyCPU' ">
     <DebugType>pdbonly</DebugType>
diff --git a/osu.Game.Modes.Taiko/osu.Game.Modes.Taiko.csproj b/osu.Game.Modes.Taiko/osu.Game.Modes.Taiko.csproj
index 19ba5c77e4..03137802d4 100644
--- a/osu.Game.Modes.Taiko/osu.Game.Modes.Taiko.csproj
+++ b/osu.Game.Modes.Taiko/osu.Game.Modes.Taiko.csproj
@@ -21,6 +21,7 @@
     <ErrorReport>prompt</ErrorReport>
     <WarningLevel>4</WarningLevel>
     <TreatWarningsAsErrors>false</TreatWarningsAsErrors>
+    <LangVersion>6</LangVersion>
   </PropertyGroup>
   <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Release|AnyCPU' ">
     <DebugType>pdbonly</DebugType>
diff --git a/osu.Game.Tests/osu.Game.Tests.csproj b/osu.Game.Tests/osu.Game.Tests.csproj
index 2844528d0c..ddaf33c0fc 100644
--- a/osu.Game.Tests/osu.Game.Tests.csproj
+++ b/osu.Game.Tests/osu.Game.Tests.csproj
@@ -19,6 +19,7 @@
     <WarningLevel>4</WarningLevel>
     <ConsolePause>false</ConsolePause>
     <TreatWarningsAsErrors>false</TreatWarningsAsErrors>
+    <LangVersion>6</LangVersion>
   </PropertyGroup>
   <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Release|AnyCPU' ">
     <Optimize>true</Optimize>
diff --git a/osu.Game/osu.Game.csproj b/osu.Game/osu.Game.csproj
index f810eeec96..d73e6d0b61 100644
--- a/osu.Game/osu.Game.csproj
+++ b/osu.Game/osu.Game.csproj
@@ -24,6 +24,7 @@
     <ErrorReport>prompt</ErrorReport>
     <WarningLevel>4</WarningLevel>
     <TreatWarningsAsErrors>false</TreatWarningsAsErrors>
+    <LangVersion>6</LangVersion>
   </PropertyGroup>
   <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Release|AnyCPU' ">
     <DebugType>pdbonly</DebugType>