diff --git a/src/Termission.Core.Dotnet/Termission.Core.Dotnet.csproj b/src/Termission.Core.Dotnet/Termission.Core.Dotnet.csproj
index ee010a7..7c270b2 100644
--- a/src/Termission.Core.Dotnet/Termission.Core.Dotnet.csproj
+++ b/src/Termission.Core.Dotnet/Termission.Core.Dotnet.csproj
@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
 	
   <PropertyGroup>
-    <TargetFramework>net471</TargetFramework>
+    <TargetFramework>net461</TargetFramework>
     <RootNamespace>Juniansoft.Termission.Core</RootNamespace>
   </PropertyGroup>
   
diff --git a/src/Termission.Core.Mono/Termission.Core.Mono.csproj b/src/Termission.Core.Mono/Termission.Core.Mono.csproj
index ed3d09b..7d1631b 100644
--- a/src/Termission.Core.Mono/Termission.Core.Mono.csproj
+++ b/src/Termission.Core.Mono/Termission.Core.Mono.csproj
@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
 	
   <PropertyGroup>
-    <TargetFramework>net471</TargetFramework>
+    <TargetFramework>net461</TargetFramework>
     <RootNamespace>Juniansoft.Termission.Core</RootNamespace>
   </PropertyGroup>
   
diff --git a/src/Termission.EtoForms/Termission.EtoForms.csproj b/src/Termission.EtoForms/Termission.EtoForms.csproj
index fb57527..6160da5 100644
--- a/src/Termission.EtoForms/Termission.EtoForms.csproj
+++ b/src/Termission.EtoForms/Termission.EtoForms.csproj
@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
 	
   <PropertyGroup>
-    <TargetFramework>net471</TargetFramework>
+    <TargetFramework>net461</TargetFramework>
     <RootNamespace>Juniansoft.Termission.EtoForms</RootNamespace>
   </PropertyGroup>
   
diff --git a/src/Termission.Gtk/Termission.Gtk.csproj b/src/Termission.Gtk/Termission.Gtk.csproj
index 3ec7d93..3ca1abe 100644
--- a/src/Termission.Gtk/Termission.Gtk.csproj
+++ b/src/Termission.Gtk/Termission.Gtk.csproj
@@ -3,7 +3,7 @@
   <PropertyGroup>
     <ProjectGuid>{88D40798-93A7-4FD9-AFC6-2133B7051B42}</ProjectGuid>
     <OutputType>WinExe</OutputType>
-    <TargetFrameworkVersion>v4.7.1</TargetFrameworkVersion>
+    <TargetFrameworkVersion>v4.6.1</TargetFrameworkVersion>
     <RootNamespace>Juniansoft.Termission.GtkSharp</RootNamespace>
     <AssemblyName>Termission</AssemblyName>
   </PropertyGroup>
diff --git a/src/Termission.WinForms/Termission.WinForms.csproj b/src/Termission.WinForms/Termission.WinForms.csproj
index e23eede..eecc6ef 100644
--- a/src/Termission.WinForms/Termission.WinForms.csproj
+++ b/src/Termission.WinForms/Termission.WinForms.csproj
@@ -2,7 +2,7 @@
 
   <PropertyGroup>
     <OutputType>WinExe</OutputType>
-    <TargetFramework>net471</TargetFramework>
+    <TargetFramework>net461</TargetFramework>
     <ApplicationIcon>..\..\resources\DevAppIcon.ico</ApplicationIcon>
     <AssemblyName>Termission</AssemblyName>
     <RootNamespace>Juniansoft.Termission.WinForms</RootNamespace>
diff --git a/src/Termission.Wpf/Termission.Wpf.csproj b/src/Termission.Wpf/Termission.Wpf.csproj
index ae1821b..72c45e3 100644
--- a/src/Termission.Wpf/Termission.Wpf.csproj
+++ b/src/Termission.Wpf/Termission.Wpf.csproj
@@ -8,7 +8,7 @@
     <OutputType>WinExe</OutputType>
     <RootNamespace>Termission.Wpf</RootNamespace>
     <AssemblyName>Termission.Wpf</AssemblyName>
-    <TargetFrameworkVersion>v4.7.1</TargetFrameworkVersion>
+    <TargetFrameworkVersion>v4.6.1</TargetFrameworkVersion>
     <FileAlignment>512</FileAlignment>
     <WarningLevel>4</WarningLevel>
     <AutoGenerateBindingRedirects>true</AutoGenerateBindingRedirects>
diff --git a/src/Termission.XamMac/Termission.XamMac.csproj b/src/Termission.XamMac/Termission.XamMac.csproj
index 0eaba33..97da3e9 100644
--- a/src/Termission.XamMac/Termission.XamMac.csproj
+++ b/src/Termission.XamMac/Termission.XamMac.csproj
@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="utf-8"?>
 <Project DefaultTargets="Build" ToolsVersion="4.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
   <PropertyGroup>
-    <TargetFrameworkVersion>v4.7.1</TargetFrameworkVersion>
+    <TargetFrameworkVersion>v4.6.1</TargetFrameworkVersion>
     <Configuration Condition=" '$(Configuration)' == '' ">Debug</Configuration>
     <Platform Condition=" '$(Platform)' == '' ">AnyCPU</Platform>
     <ProjectGuid>{47C59A57-6220-4C6C-ADBB-5F1C038A3012}</ProjectGuid>