diff --git a/tools/ColorTool/ColorTool/ColorTool.csproj b/tools/ColorTool/ColorTool/ColorTool.csproj
index 4592e70a6..46974cc06 100644
--- a/tools/ColorTool/ColorTool/ColorTool.csproj
+++ b/tools/ColorTool/ColorTool/ColorTool.csproj
@@ -8,7 +8,7 @@
     <OutputType>Exe</OutputType>
     <RootNamespace>ColorTool</RootNamespace>
     <AssemblyName>colortool</AssemblyName>
-    <TargetFrameworkVersion>v4.7</TargetFrameworkVersion>
+    <TargetFrameworkVersion>v4.6</TargetFrameworkVersion>
     <FileAlignment>512</FileAlignment>
     <AutoGenerateBindingRedirects>true</AutoGenerateBindingRedirects>
     <TargetFrameworkProfile />