diff --git a/visualc/vngspice.vcxproj b/visualc/vngspice.vcxproj
index d6db4d64b..ae9a1e4a0 100644
--- a/visualc/vngspice.vcxproj
+++ b/visualc/vngspice.vcxproj
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
-<Project DefaultTargets="Build" ToolsVersion="4.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+<Project DefaultTargets="Build" ToolsVersion="14.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
   <ItemGroup Label="ProjectConfigurations">
     <ProjectConfiguration Include="Debug|Win32">
       <Configuration>Debug</Configuration>
@@ -58,47 +58,59 @@
   <Import Project="$(VCTargetsPath)\Microsoft.Cpp.Default.props" />
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'" Label="Configuration">
     <ConfigurationType>Application</ConfigurationType>
+    <PlatformToolset>v140</PlatformToolset>
   </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|Win32'" Label="Configuration">
     <ConfigurationType>Application</ConfigurationType>
     <WholeProgramOptimization>true</WholeProgramOptimization>
+    <PlatformToolset>v140</PlatformToolset>
   </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|x64'" Label="Configuration">
     <ConfigurationType>Application</ConfigurationType>
+    <PlatformToolset>v140</PlatformToolset>
   </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|x64'" Label="Configuration">
     <ConfigurationType>Application</ConfigurationType>
     <WholeProgramOptimization>true</WholeProgramOptimization>
+    <PlatformToolset>v140</PlatformToolset>
   </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='console_debug|Win32'" Label="Configuration">
     <ConfigurationType>Application</ConfigurationType>
+    <PlatformToolset>v140</PlatformToolset>
   </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='console_release|Win32'" Label="Configuration">
     <ConfigurationType>Application</ConfigurationType>
     <WholeProgramOptimization>true</WholeProgramOptimization>
+    <PlatformToolset>v140</PlatformToolset>
   </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='console_debug|x64'" Label="Configuration">
     <ConfigurationType>Application</ConfigurationType>
+    <PlatformToolset>v140</PlatformToolset>
   </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='console_release|x64'" Label="Configuration">
     <ConfigurationType>Application</ConfigurationType>
     <WholeProgramOptimization>true</WholeProgramOptimization>
+    <PlatformToolset>v140</PlatformToolset>
   </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='ReleaseOMP|Win32'" Label="Configuration">
     <ConfigurationType>Application</ConfigurationType>
     <WholeProgramOptimization>true</WholeProgramOptimization>
+    <PlatformToolset>v140</PlatformToolset>
   </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='ReleaseOMP|x64'" Label="Configuration">
     <ConfigurationType>Application</ConfigurationType>
     <WholeProgramOptimization>true</WholeProgramOptimization>
+    <PlatformToolset>v140</PlatformToolset>
   </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='console_release_omp|Win32'" Label="Configuration">
     <ConfigurationType>Application</ConfigurationType>
     <WholeProgramOptimization>true</WholeProgramOptimization>
+    <PlatformToolset>v140</PlatformToolset>
   </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='console_release_omp|x64'" Label="Configuration">
     <ConfigurationType>Application</ConfigurationType>
     <WholeProgramOptimization>true</WholeProgramOptimization>
+    <PlatformToolset>v140</PlatformToolset>
   </PropertyGroup>
   <Import Project="$(VCTargetsPath)\Microsoft.Cpp.props" />
   <ImportGroup Label="ExtensionSettings">
diff --git a/visualc/vngspice_fftw.vcxproj b/visualc/vngspice_fftw.vcxproj
index 8ae046853..e1f8d3fc8 100644
--- a/visualc/vngspice_fftw.vcxproj
+++ b/visualc/vngspice_fftw.vcxproj
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
-<Project DefaultTargets="Build" ToolsVersion="4.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+<Project DefaultTargets="Build" ToolsVersion="14.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
   <ItemGroup Label="ProjectConfigurations">
     <ProjectConfiguration Include="Debug|Win32">
       <Configuration>Debug</Configuration>
@@ -59,59 +59,59 @@
   <Import Project="$(VCTargetsPath)\Microsoft.Cpp.Default.props" />
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'" Label="Configuration">
     <ConfigurationType>Application</ConfigurationType>
-    <PlatformToolset>Windows7.1SDK</PlatformToolset>
+    <PlatformToolset>v140</PlatformToolset>
   </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|Win32'" Label="Configuration">
     <ConfigurationType>Application</ConfigurationType>
     <WholeProgramOptimization>true</WholeProgramOptimization>
-    <PlatformToolset>Windows7.1SDK</PlatformToolset>
+    <PlatformToolset>v140</PlatformToolset>
   </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|x64'" Label="Configuration">
     <ConfigurationType>Application</ConfigurationType>
-    <PlatformToolset>Windows7.1SDK</PlatformToolset>
+    <PlatformToolset>v140</PlatformToolset>
   </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|x64'" Label="Configuration">
     <ConfigurationType>Application</ConfigurationType>
     <WholeProgramOptimization>true</WholeProgramOptimization>
-    <PlatformToolset>Windows7.1SDK</PlatformToolset>
+    <PlatformToolset>v140</PlatformToolset>
   </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='console_debug|Win32'" Label="Configuration">
     <ConfigurationType>Application</ConfigurationType>
-    <PlatformToolset>Windows7.1SDK</PlatformToolset>
+    <PlatformToolset>v140</PlatformToolset>
   </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='console_release|Win32'" Label="Configuration">
     <ConfigurationType>Application</ConfigurationType>
     <WholeProgramOptimization>true</WholeProgramOptimization>
-    <PlatformToolset>Windows7.1SDK</PlatformToolset>
+    <PlatformToolset>v140</PlatformToolset>
   </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='console_debug|x64'" Label="Configuration">
     <ConfigurationType>Application</ConfigurationType>
-    <PlatformToolset>Windows7.1SDK</PlatformToolset>
+    <PlatformToolset>v140</PlatformToolset>
   </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='console_release|x64'" Label="Configuration">
     <ConfigurationType>Application</ConfigurationType>
     <WholeProgramOptimization>true</WholeProgramOptimization>
-    <PlatformToolset>Windows7.1SDK</PlatformToolset>
+    <PlatformToolset>v140</PlatformToolset>
   </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='ReleaseOMP|Win32'" Label="Configuration">
     <ConfigurationType>Application</ConfigurationType>
     <WholeProgramOptimization>true</WholeProgramOptimization>
-    <PlatformToolset>Windows7.1SDK</PlatformToolset>
+    <PlatformToolset>v140</PlatformToolset>
   </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='ReleaseOMP|x64'" Label="Configuration">
     <ConfigurationType>Application</ConfigurationType>
     <WholeProgramOptimization>true</WholeProgramOptimization>
-    <PlatformToolset>Windows7.1SDK</PlatformToolset>
+    <PlatformToolset>v140</PlatformToolset>
   </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='console_release_omp|Win32'" Label="Configuration">
     <ConfigurationType>Application</ConfigurationType>
     <WholeProgramOptimization>true</WholeProgramOptimization>
-    <PlatformToolset>Windows7.1SDK</PlatformToolset>
+    <PlatformToolset>v140</PlatformToolset>
   </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='console_release_omp|x64'" Label="Configuration">
     <ConfigurationType>Application</ConfigurationType>
     <WholeProgramOptimization>true</WholeProgramOptimization>
-    <PlatformToolset>Windows7.1SDK</PlatformToolset>
+    <PlatformToolset>v140</PlatformToolset>
   </PropertyGroup>
   <Import Project="$(VCTargetsPath)\Microsoft.Cpp.props" />
   <ImportGroup Label="ExtensionSettings">