diff --git a/QuickLook.Plugin/QuickLook.Plugin.CsvViewer/QuickLook.Plugin.CsvViewer.csproj b/QuickLook.Plugin/QuickLook.Plugin.CsvViewer/QuickLook.Plugin.CsvViewer.csproj
index 1851741..e4e9196 100644
--- a/QuickLook.Plugin/QuickLook.Plugin.CsvViewer/QuickLook.Plugin.CsvViewer.csproj
+++ b/QuickLook.Plugin/QuickLook.Plugin.CsvViewer/QuickLook.Plugin.CsvViewer.csproj
@@ -58,7 +58,6 @@
     <Reference Include="CsvHelper, Version=5.0.0.0, Culture=neutral, PublicKeyToken=8c4959082be5c823, processorArchitecture=MSIL">
       <HintPath>..\..\packages\CsvHelper.5.0.0.1\lib\net45\CsvHelper.dll</HintPath>
     </Reference>
-    <Reference Include="Microsoft.CSharp" />
     <Reference Include="System" />
     <Reference Include="System.Core" />
     <Reference Include="System.Xaml">
diff --git a/QuickLook.Plugin/QuickLook.Plugin.HtmlViewer/QuickLook.Plugin.HtmlViewer.csproj b/QuickLook.Plugin/QuickLook.Plugin.HtmlViewer/QuickLook.Plugin.HtmlViewer.csproj
index 93d6f91..1b2b7d5 100644
--- a/QuickLook.Plugin/QuickLook.Plugin.HtmlViewer/QuickLook.Plugin.HtmlViewer.csproj
+++ b/QuickLook.Plugin/QuickLook.Plugin.HtmlViewer/QuickLook.Plugin.HtmlViewer.csproj
@@ -62,7 +62,6 @@
     <Reference Include="Microsoft.CSharp" />
     <Reference Include="System" />
     <Reference Include="System.Core" />
-    <Reference Include="System.Drawing" />
     <Reference Include="System.Windows.Forms" />
     <Reference Include="System.Xaml">
       <RequiredTargetFramework>4.0</RequiredTargetFramework>