diff --git a/ClosedXML/ClosedXML.csproj b/ClosedXML/ClosedXML.csproj
index 84c5f14..3f719ea 100644
--- a/ClosedXML/ClosedXML.csproj
+++ b/ClosedXML/ClosedXML.csproj
@@ -10,9 +10,8 @@
     <AppDesignerFolder>Properties</AppDesignerFolder>
     <RootNamespace>ClosedXML</RootNamespace>
     <AssemblyName>ClosedXML</AssemblyName>
-    <TargetFrameworkVersion>v4.0</TargetFrameworkVersion>
+    <TargetFrameworkVersion>v4.5.2</TargetFrameworkVersion>
     <FileAlignment>512</FileAlignment>
-    <TargetFrameworkProfile>Client</TargetFrameworkProfile>
     <SolutionDir Condition="$(SolutionDir) == '' Or $(SolutionDir) == '*Undefined*'">..\</SolutionDir>
     <RestorePackages>true</RestorePackages>
   </PropertyGroup>
@@ -26,6 +25,7 @@
     <ErrorReport>prompt</ErrorReport>
     <WarningLevel>4</WarningLevel>
     <NoWarn>1591</NoWarn>
+    <Prefer32Bit>false</Prefer32Bit>
   </PropertyGroup>
   <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Release|AnyCPU' ">
     <DebugType>pdbonly</DebugType>
@@ -37,6 +37,7 @@
     <WarningLevel>4</WarningLevel>
     <DocumentationFile>bin\Release\ClosedXML.xml</DocumentationFile>
     <NoWarn>1591</NoWarn>
+    <Prefer32Bit>false</Prefer32Bit>
   </PropertyGroup>
   <PropertyGroup>
     <SignAssembly>true</SignAssembly>
@@ -46,8 +47,8 @@
   </PropertyGroup>
   <ItemGroup>
     <Reference Include="DocumentFormat.OpenXml, Version=2.5.5631.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35, processorArchitecture=MSIL">
-      <Private>True</Private>
       <HintPath>..\packages\DocumentFormat.OpenXml.2.5\lib\DocumentFormat.OpenXml.dll</HintPath>
+      <Private>True</Private>
     </Reference>
     <Reference Include="FastMember.Signed, Version=1.0.0.9, Culture=neutral, PublicKeyToken=9e8f22703bef9a29, processorArchitecture=MSIL">
       <HintPath>..\packages\FastMember.Signed.1.1.0\lib\net40\FastMember.Signed.dll</HintPath>
diff --git a/ClosedXML/packages.config b/ClosedXML/packages.config
index 682875d..698997e 100644
--- a/ClosedXML/packages.config
+++ b/ClosedXML/packages.config
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
 <packages>
-  <package id="DocumentFormat.OpenXml" version="2.5" targetFramework="net40-Client" />
-  <package id="FastMember.Signed" version="1.1.0" targetFramework="net40-client" />
+  <package id="DocumentFormat.OpenXml" version="2.5" targetFramework="net452" />
+  <package id="FastMember.Signed" version="1.1.0" targetFramework="net452" />
 </packages>
\ No newline at end of file
diff --git a/ClosedXML_Examples/ClosedXML_Examples.csproj b/ClosedXML_Examples/ClosedXML_Examples.csproj
index 155d094..092f18b 100644
--- a/ClosedXML_Examples/ClosedXML_Examples.csproj
+++ b/ClosedXML_Examples/ClosedXML_Examples.csproj
@@ -10,7 +10,7 @@
     <AppDesignerFolder>Properties</AppDesignerFolder>
     <RootNamespace>ClosedXML_Examples</RootNamespace>
     <AssemblyName>ClosedXML_Examples</AssemblyName>
-    <TargetFrameworkVersion>v4.0</TargetFrameworkVersion>
+    <TargetFrameworkVersion>v4.5.2</TargetFrameworkVersion>
     <TargetFrameworkProfile>
     </TargetFrameworkProfile>
     <FileAlignment>512</FileAlignment>
@@ -24,6 +24,7 @@
     <DebugType>full</DebugType>
     <PlatformTarget>AnyCPU</PlatformTarget>
     <ErrorReport>prompt</ErrorReport>
+    <Prefer32Bit>false</Prefer32Bit>
   </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)' == 'Release|AnyCPU'">
     <OutputPath>bin\Release\</OutputPath>
@@ -32,6 +33,7 @@
     <DebugType>pdbonly</DebugType>
     <PlatformTarget>AnyCPU</PlatformTarget>
     <ErrorReport>prompt</ErrorReport>
+    <Prefer32Bit>false</Prefer32Bit>
   </PropertyGroup>
   <PropertyGroup>
     <StartupObject>ClosedXML_Examples.Program</StartupObject>
@@ -44,6 +46,7 @@
   </PropertyGroup>
   <ItemGroup>
     <Reference Include="DocumentFormat.OpenXml, Version=2.5.5631.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35, processorArchitecture=MSIL">
+      <HintPath>..\packages\DocumentFormat.OpenXml.2.5\lib\DocumentFormat.OpenXml.dll</HintPath>
       <Private>True</Private>
     </Reference>
     <Reference Include="System" />
diff --git a/ClosedXML_Examples/app.config b/ClosedXML_Examples/app.config
index cb2586b..af399dd 100644
--- a/ClosedXML_Examples/app.config
+++ b/ClosedXML_Examples/app.config
@@ -1,3 +1,6 @@
 <?xml version="1.0"?>
 <configuration>
-<startup><supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.0"/></startup></configuration>
+  <startup>
+    <supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.5.2"/>
+  </startup>
+</configuration>
diff --git a/ClosedXML_Examples/packages.config b/ClosedXML_Examples/packages.config
index 3a74e72..b1cea46 100644
--- a/ClosedXML_Examples/packages.config
+++ b/ClosedXML_Examples/packages.config
@@ -1,4 +1,4 @@
 <?xml version="1.0" encoding="utf-8"?>
 <packages>
-  <package id="DocumentFormat.OpenXml" version="2.5" targetFramework="net40" />
+  <package id="DocumentFormat.OpenXml" version="2.5" targetFramework="net452" />
 </packages>
\ No newline at end of file
diff --git a/ClosedXML_Sandbox/ClosedXML_Sandbox.csproj b/ClosedXML_Sandbox/ClosedXML_Sandbox.csproj
index 2b2d041..912fbe9 100644
--- a/ClosedXML_Sandbox/ClosedXML_Sandbox.csproj
+++ b/ClosedXML_Sandbox/ClosedXML_Sandbox.csproj
@@ -10,9 +10,7 @@
     <AppDesignerFolder>Properties</AppDesignerFolder>
     <RootNamespace>ClosedXML_Sandbox</RootNamespace>
     <AssemblyName>ClosedXML_Sandbox</AssemblyName>
-    <TargetFrameworkVersion>v4.5.1</TargetFrameworkVersion>
-    <TargetFrameworkProfile>
-    </TargetFrameworkProfile>
+    <TargetFrameworkVersion>v4.5.2</TargetFrameworkVersion>
     <FileAlignment>512</FileAlignment>
     <SolutionDir Condition="$(SolutionDir) == '' Or $(SolutionDir) == '*Undefined*'">..\</SolutionDir>
     <RestorePackages>true</RestorePackages>
diff --git a/ClosedXML_Sandbox/app.config b/ClosedXML_Sandbox/app.config
index 22c902a..af399dd 100644
--- a/ClosedXML_Sandbox/app.config
+++ b/ClosedXML_Sandbox/app.config
@@ -1,3 +1,6 @@
 <?xml version="1.0"?>
 <configuration>
-<startup><supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.5.1"/></startup></configuration>
+  <startup>
+    <supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.5.2"/>
+  </startup>
+</configuration>
diff --git a/ClosedXML_Sandbox/packages.config b/ClosedXML_Sandbox/packages.config
index 3a74e72..b1cea46 100644
--- a/ClosedXML_Sandbox/packages.config
+++ b/ClosedXML_Sandbox/packages.config
@@ -1,4 +1,4 @@
 <?xml version="1.0" encoding="utf-8"?>
 <packages>
-  <package id="DocumentFormat.OpenXml" version="2.5" targetFramework="net40" />
+  <package id="DocumentFormat.OpenXml" version="2.5" targetFramework="net452" />
 </packages>
\ No newline at end of file
diff --git a/ClosedXML_Tests/ClosedXML_Tests.csproj b/ClosedXML_Tests/ClosedXML_Tests.csproj
index 4b5abe1..b538dfe 100644
--- a/ClosedXML_Tests/ClosedXML_Tests.csproj
+++ b/ClosedXML_Tests/ClosedXML_Tests.csproj
@@ -11,7 +11,7 @@
     <AppDesignerFolder>Properties</AppDesignerFolder>
     <RootNamespace>ClosedXML_Tests</RootNamespace>
     <AssemblyName>ClosedXML_Tests</AssemblyName>
-    <TargetFrameworkVersion>v4.0</TargetFrameworkVersion>
+    <TargetFrameworkVersion>v4.5.2</TargetFrameworkVersion>
     <FileAlignment>512</FileAlignment>
     <ProjectTypeGuids>{3AC096D0-A1C2-E12C-1390-A8335801FDAB};{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}</ProjectTypeGuids>
     <SolutionDir Condition="$(SolutionDir) == '' Or $(SolutionDir) == '*Undefined*'">..\</SolutionDir>
@@ -25,6 +25,7 @@
     <DefineConstants>DEBUG;TRACE;$(AppVeyor)</DefineConstants>
     <ErrorReport>prompt</ErrorReport>
     <WarningLevel>4</WarningLevel>
+    <Prefer32Bit>false</Prefer32Bit>
   </PropertyGroup>
   <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Release|AnyCPU' ">
     <DebugType>pdbonly</DebugType>
@@ -33,6 +34,7 @@
     <DefineConstants>TRACE;$(AppVeyor)</DefineConstants>
     <ErrorReport>prompt</ErrorReport>
     <WarningLevel>4</WarningLevel>
+    <Prefer32Bit>false</Prefer32Bit>
   </PropertyGroup>
   <PropertyGroup>
     <SignAssembly>true</SignAssembly>
@@ -47,7 +49,7 @@
     </Reference>
     <Reference Include="Microsoft.CSharp" />
     <Reference Include="nunit.framework, Version=3.4.1.0, Culture=neutral, PublicKeyToken=2638cd05610744eb, processorArchitecture=MSIL">
-      <HintPath>..\packages\NUnit.3.4.1\lib\net40\nunit.framework.dll</HintPath>
+      <HintPath>..\packages\NUnit.3.4.1\lib\net45\nunit.framework.dll</HintPath>
       <Private>True</Private>
     </Reference>
     <Reference Include="System" />
diff --git a/ClosedXML_Tests/packages.config b/ClosedXML_Tests/packages.config
index dcf0b39..167f5f7 100644
--- a/ClosedXML_Tests/packages.config
+++ b/ClosedXML_Tests/packages.config
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
 <packages>
-  <package id="DocumentFormat.OpenXml" version="2.5" targetFramework="net40" />
-  <package id="NUnit" version="3.4.1" targetFramework="net40" />
+  <package id="DocumentFormat.OpenXml" version="2.5" targetFramework="net452" />
+  <package id="NUnit" version="3.4.1" targetFramework="net452" />
 </packages>
\ No newline at end of file