diff --git a/VsDingExtension.sln b/VsDingExtension.sln
index 7100bf6..8b62d08 100644
--- a/VsDingExtension.sln
+++ b/VsDingExtension.sln
@@ -1,8 +1,6 @@
 
 Microsoft Visual Studio Solution File, Format Version 12.00
-# Visual Studio 14
-VisualStudioVersion = 14.0.24720.0
-MinimumVisualStudioVersion = 10.0.40219.1
+# Visual Studio 12
 Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "Solution Items", "Solution Items", "{5BD9D4DB-8683-4698-8D24-01EE7306F73A}"
 	ProjectSection(SolutionItems) = preProject
 		IntegrationTests.testsettings = IntegrationTests.testsettings
diff --git a/VsDingExtensionFor2012/VsDingExtensionFor2012.csproj b/VsDingExtensionFor2012/VsDingExtensionFor2012.csproj
index e849744..248919d 100644
--- a/VsDingExtensionFor2012/VsDingExtensionFor2012.csproj
+++ b/VsDingExtensionFor2012/VsDingExtensionFor2012.csproj
@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="utf-8"?>
 <Project DefaultTargets="Build" xmlns="http://schemas.microsoft.com/developer/msbuild/2003" ToolsVersion="4.0">
   <PropertyGroup>
-    <MinimumVisualStudioVersion>14.0</MinimumVisualStudioVersion>
+    <MinimumVisualStudioVersion>11.0</MinimumVisualStudioVersion>
     <VisualStudioVersion Condition="'$(VisualStudioVersion)' == ''">11.0</VisualStudioVersion>
     <VSToolsPath Condition="'$(VSToolsPath)' == ''">$(MSBuildExtensionsPath32)\Microsoft\VisualStudio\v$(VisualStudioVersion)</VSToolsPath>
     <FileUpgradeFlags>
diff --git a/VsDingExtensionProject/VsDingExtensionProject.csproj b/VsDingExtensionProject/VsDingExtensionProject.csproj
index 02f873f..7517e8d 100644
--- a/VsDingExtensionProject/VsDingExtensionProject.csproj
+++ b/VsDingExtensionProject/VsDingExtensionProject.csproj
@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="utf-8"?>
 <Project DefaultTargets="Build" xmlns="http://schemas.microsoft.com/developer/msbuild/2003" ToolsVersion="12.0">
   <PropertyGroup>
-    <MinimumVisualStudioVersion>14.0</MinimumVisualStudioVersion>
+    <MinimumVisualStudioVersion>12.0</MinimumVisualStudioVersion>
     <VisualStudioVersion Condition="'$(VisualStudioVersion)' == ''">12.0</VisualStudioVersion>
     <VSToolsPath Condition="'$(VSToolsPath)' == ''">$(MSBuildExtensionsPath32)\Microsoft\VisualStudio\v$(VisualStudioVersion)</VSToolsPath>
     <TargetFrameworkProfile />