Index: Ringtoets/Integration/test/Ringtoets.Integration.IO.TestUtil.Test/Ringtoets.Integration.IO.TestUtil.Test.csproj
===================================================================
diff -u -rb2c1971e9e3264afd7b55e68f0de2ca589e3f750 -r4552827a99f65ac03bd340be8600b9a2b01b6363
--- Ringtoets/Integration/test/Ringtoets.Integration.IO.TestUtil.Test/Ringtoets.Integration.IO.TestUtil.Test.csproj	(.../Ringtoets.Integration.IO.TestUtil.Test.csproj)	(revision b2c1971e9e3264afd7b55e68f0de2ca589e3f750)
+++ Ringtoets/Integration/test/Ringtoets.Integration.IO.TestUtil.Test/Ringtoets.Integration.IO.TestUtil.Test.csproj	(.../Ringtoets.Integration.IO.TestUtil.Test.csproj)	(revision 4552827a99f65ac03bd340be8600b9a2b01b6363)
@@ -1,20 +1,12 @@
 <?xml version="1.0" encoding="utf-8"?>
 <Project ToolsVersion="15.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
-  <Import Project="..\..\..\..\packages\NUnit.3.10.1\build\NUnit.props" Condition="Exists('..\..\..\..\packages\NUnit.3.10.1\build\NUnit.props')" />
   <PropertyGroup>
     <ProjectGuid>{C4EE67E7-6E00-4735-9439-32D9B2054E40}</ProjectGuid>
     <RootNamespace>Ringtoets.Integration.IO.TestUtil.Test</RootNamespace>
     <AssemblyName>Ringtoets.Integration.IO.TestUtil.Test</AssemblyName>
   </PropertyGroup>
   <Import Project="$(SolutionDir)\build\Ringtoets_Test.targets" />
   <ItemGroup>
-    <Reference Include="nunit.framework, Version=3.10.1.0, Culture=neutral, PublicKeyToken=2638cd05610744eb, processorArchitecture=MSIL">
-      <HintPath>..\..\..\..\packages\NUnit.3.10.1\lib\net40\nunit.framework.dll</HintPath>
-    </Reference>
-    <Reference Include="System" />
-    <Reference Include="System.Core" />
-  </ItemGroup>
-  <ItemGroup>
     <Compile Include="ExportableFailureMechanismSectionTestFactoryTest.cs" />
     <Compile Include="ExportableSectionAssemblyResultTestFactoryTest.cs" />
     <Compile Include="Properties\AssemblyInfo.cs" />
@@ -43,11 +35,10 @@
       <Name>Ringtoets.Integration.IO.TestUtil</Name>
     </ProjectReference>
   </ItemGroup>
+  <ItemGroup>
+    <Reference Include="nunit.framework, Version=3.8.1.0, Culture=neutral, PublicKeyToken=2638cd05610744eb, processorArchitecture=MSIL">
+      <HintPath>..\..\..\..\packages\NUnit.3.8.1\lib\net40\nunit.framework.dll</HintPath>
+    </Reference>
+  </ItemGroup>
   <Import Project="$(MSBuildToolsPath)\Microsoft.CSharp.targets" />
-  <Target Name="EnsureNuGetPackageBuildImports" BeforeTargets="PrepareForBuild">
-    <PropertyGroup>
-      <ErrorText>This project references NuGet package(s) that are missing on this computer. Use NuGet Package Restore to download them.  For more information, see http://go.microsoft.com/fwlink/?LinkID=322105. The missing file is {0}.</ErrorText>
-    </PropertyGroup>
-    <Error Condition="!Exists('..\..\..\..\packages\NUnit.3.10.1\build\NUnit.props')" Text="$([System.String]::Format('$(ErrorText)', '..\..\..\..\packages\NUnit.3.10.1\build\NUnit.props'))" />
-  </Target>
 </Project>
\ No newline at end of file
Index: Ringtoets/Integration/test/Ringtoets.Integration.IO.TestUtil.Test/packages.config
===================================================================
diff -u -rb2c1971e9e3264afd7b55e68f0de2ca589e3f750 -r4552827a99f65ac03bd340be8600b9a2b01b6363
--- Ringtoets/Integration/test/Ringtoets.Integration.IO.TestUtil.Test/packages.config	(.../packages.config)	(revision b2c1971e9e3264afd7b55e68f0de2ca589e3f750)
+++ Ringtoets/Integration/test/Ringtoets.Integration.IO.TestUtil.Test/packages.config	(.../packages.config)	(revision 4552827a99f65ac03bd340be8600b9a2b01b6363)
@@ -1,4 +1,26 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?><!--
+Copyright (C) Stichting Deltares 2017. All rights reserved.
+
+This file is part of Ringtoets.
+
+Ringtoets is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, either version 3 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program. If not, see <http://www.gnu.org/licenses/>.
+
+All names, logos, and references to "Deltares" are registered trademarks of
+Stichting Deltares and remain full property of Stichting Deltares at all times.
+All rights reserved.
+-->
+
 <packages>
-  <package id="NUnit" version="3.10.1" targetFramework="net40" />
+  <package id="NUnit" version="3.8.1" targetFramework="net40" />
 </packages>
\ No newline at end of file