diff --git a/atk/atk.csproj b/atk/atk.csproj
index f769119f0..27b2979f4 100644
--- a/atk/atk.csproj
+++ b/atk/atk.csproj
@@ -9,7 +9,8 @@
     <OutputType>Library</OutputType>
     <RootNamespace>atk</RootNamespace>
     <AssemblyName>atk-sharp</AssemblyName>
-    <TargetFrameworkVersion>v3.5</TargetFrameworkVersion>
+    <TargetFrameworkVersion>v4.0</TargetFrameworkVersion>
+    <TargetFrameworkProfile />
   </PropertyGroup>
   <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|x86' ">
     <DebugSymbols>true</DebugSymbols>
diff --git a/audit/audit.csproj b/audit/audit.csproj
index 64980a516..19f2cedfe 100644
--- a/audit/audit.csproj
+++ b/audit/audit.csproj
@@ -9,7 +9,8 @@
     <OutputType>Exe</OutputType>
     <RootNamespace>audit</RootNamespace>
     <AssemblyName>audit</AssemblyName>
-    <TargetFrameworkVersion>v3.5</TargetFrameworkVersion>
+    <TargetFrameworkVersion>v4.0</TargetFrameworkVersion>
+    <TargetFrameworkProfile />
   </PropertyGroup>
   <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|x86' ">
     <DebugSymbols>true</DebugSymbols>
diff --git a/cairo/cairo.csproj b/cairo/cairo.csproj
index 632d1dbdf..3b4d65db8 100644
--- a/cairo/cairo.csproj
+++ b/cairo/cairo.csproj
@@ -9,7 +9,8 @@
     <OutputType>Library</OutputType>
     <RootNamespace>cairo</RootNamespace>
     <AssemblyName>cairo-sharp</AssemblyName>
-    <TargetFrameworkVersion>v3.5</TargetFrameworkVersion>
+    <TargetFrameworkVersion>v4.0</TargetFrameworkVersion>
+    <TargetFrameworkProfile />
   </PropertyGroup>
   <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|x86' ">
     <DebugSymbols>true</DebugSymbols>
diff --git a/gdk/gdk.csproj b/gdk/gdk.csproj
index 2c16a1234..5d9306b8f 100644
--- a/gdk/gdk.csproj
+++ b/gdk/gdk.csproj
@@ -9,7 +9,8 @@
     <OutputType>Library</OutputType>
     <RootNamespace>gdk</RootNamespace>
     <AssemblyName>gdk-sharp</AssemblyName>
-    <TargetFrameworkVersion>v3.5</TargetFrameworkVersion>
+    <TargetFrameworkVersion>v4.0</TargetFrameworkVersion>
+    <TargetFrameworkProfile />
   </PropertyGroup>
   <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|x86' ">
     <DebugSymbols>true</DebugSymbols>
diff --git a/generator/generator.csproj b/generator/generator.csproj
index df6e0f6bc..b4673e6bc 100644
--- a/generator/generator.csproj
+++ b/generator/generator.csproj
@@ -9,7 +9,8 @@
     <OutputType>Exe</OutputType>
     <RootNamespace>generator</RootNamespace>
     <AssemblyName>gapi_codegen</AssemblyName>
-    <TargetFrameworkVersion>v3.5</TargetFrameworkVersion>
+    <TargetFrameworkVersion>v4.0</TargetFrameworkVersion>
+    <TargetFrameworkProfile />
   </PropertyGroup>
   <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|x86' ">
     <DebugSymbols>true</DebugSymbols>
diff --git a/gio/gio.csproj b/gio/gio.csproj
index 3a93a421e..71e01d2c0 100644
--- a/gio/gio.csproj
+++ b/gio/gio.csproj
@@ -9,7 +9,8 @@
     <OutputType>Library</OutputType>
     <RootNamespace>gio</RootNamespace>
     <AssemblyName>gio-sharp</AssemblyName>
-    <TargetFrameworkVersion>v3.5</TargetFrameworkVersion>
+    <TargetFrameworkVersion>v4.0</TargetFrameworkVersion>
+    <TargetFrameworkProfile />
   </PropertyGroup>
   <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|x86' ">
     <DebugSymbols>true</DebugSymbols>
diff --git a/glib/glib.csproj b/glib/glib.csproj
index b80beb776..55eccbd27 100644
--- a/glib/glib.csproj
+++ b/glib/glib.csproj
@@ -9,7 +9,8 @@
     <OutputType>Library</OutputType>
     <RootNamespace>glib</RootNamespace>
     <AssemblyName>glib-sharp</AssemblyName>
-    <TargetFrameworkVersion>v3.5</TargetFrameworkVersion>
+    <TargetFrameworkVersion>v4.0</TargetFrameworkVersion>
+    <TargetFrameworkProfile />
   </PropertyGroup>
   <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|x86' ">
     <DebugSymbols>true</DebugSymbols>
diff --git a/gtk/gtk.csproj b/gtk/gtk.csproj
index 2dfa09d66..ef90088fd 100644
--- a/gtk/gtk.csproj
+++ b/gtk/gtk.csproj
@@ -9,7 +9,8 @@
     <OutputType>Library</OutputType>
     <RootNamespace>gtk</RootNamespace>
     <AssemblyName>gtk-sharp</AssemblyName>
-    <TargetFrameworkVersion>v3.5</TargetFrameworkVersion>
+    <TargetFrameworkVersion>v4.0</TargetFrameworkVersion>
+    <TargetFrameworkProfile />
   </PropertyGroup>
   <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|x86' ">
     <DebugSymbols>true</DebugSymbols>
diff --git a/pango/pango.csproj b/pango/pango.csproj
index 23a03068f..f60d9ae9a 100644
--- a/pango/pango.csproj
+++ b/pango/pango.csproj
@@ -9,7 +9,8 @@
     <OutputType>Library</OutputType>
     <RootNamespace>pango</RootNamespace>
     <AssemblyName>pango-sharp</AssemblyName>
-    <TargetFrameworkVersion>v3.5</TargetFrameworkVersion>
+    <TargetFrameworkVersion>v4.0</TargetFrameworkVersion>
+    <TargetFrameworkProfile />
   </PropertyGroup>
   <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|x86' ">
     <DebugSymbols>true</DebugSymbols>