diff --git a/src/TestData/TestData.csproj b/src/TestData/TestData.csproj
index aa3d569c..2bfc155d 100644
--- a/src/TestData/TestData.csproj
+++ b/src/TestData/TestData.csproj
@@ -26,7 +26,7 @@
     <CodeAnalysisRuleSet>AllRules.ruleset</CodeAnalysisRuleSet>
     <NoWarn>1591</NoWarn>
     <Prefer32Bit>false</Prefer32Bit>
-    <LangVersion>5</LangVersion>
+    <LangVersion>6</LangVersion>
   </PropertyGroup>
   <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|AnyCPU' ">
     <DefineConstants>DEBUG;TRACE</DefineConstants>
@@ -41,7 +41,7 @@
     <PlatformTarget>AnyCPU</PlatformTarget>
     <NoWarn>1591</NoWarn>
     <Prefer32Bit>false</Prefer32Bit>
-    <LangVersion>5</LangVersion>
+    <LangVersion>6</LangVersion>
   </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)' == 'Release-Signed|AnyCPU'">
     <OutputPath>..\..\out\test-signed\Net35\</OutputPath>
@@ -57,7 +57,7 @@
     <CodeAnalysisRuleSet>AllRules.ruleset</CodeAnalysisRuleSet>
     <NoWarn>1591</NoWarn>
     <Prefer32Bit>false</Prefer32Bit>
-    <LangVersion>5</LangVersion>
+    <LangVersion>6</LangVersion>
   </PropertyGroup>
   <ItemGroup>
     <Reference Include="System" />
diff --git a/src/UnitTests/UnitTests.csproj b/src/UnitTests/UnitTests.csproj
index 35580c2a..a4c28930 100644
--- a/src/UnitTests/UnitTests.csproj
+++ b/src/UnitTests/UnitTests.csproj
@@ -30,7 +30,7 @@
     <CodeAnalysisRuleSet>AllRules.ruleset</CodeAnalysisRuleSet>
     <NoWarn>1591</NoWarn>
     <Prefer32Bit>false</Prefer32Bit>
-    <LangVersion>5</LangVersion>
+    <LangVersion>6</LangVersion>
   </PropertyGroup>
   <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|AnyCPU' ">
     <DefineConstants>DEBUG;TRACE</DefineConstants>
@@ -62,7 +62,7 @@
     <CodeAnalysisRuleSet>AllRules.ruleset</CodeAnalysisRuleSet>
     <NoWarn>1591</NoWarn>
     <Prefer32Bit>false</Prefer32Bit>
-    <LangVersion>5</LangVersion>
+    <LangVersion>6</LangVersion>
   </PropertyGroup>
   <ItemGroup>
     <Reference Include="System" />