diff --git a/ClosedXML_Tests/ClosedXML_Tests.csproj b/ClosedXML_Tests/ClosedXML_Tests.csproj
index 3ea96f8..43283c3 100644
--- a/ClosedXML_Tests/ClosedXML_Tests.csproj
+++ b/ClosedXML_Tests/ClosedXML_Tests.csproj
@@ -48,8 +48,8 @@
       <Private>True</Private>
     </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\net45\nunit.framework.dll</HintPath>
+    <Reference Include="nunit.framework, Version=3.7.1.0, Culture=neutral, PublicKeyToken=2638cd05610744eb, processorArchitecture=MSIL">
+      <HintPath>..\packages\NUnit.3.7.1\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 00ed3b8..c32aa84 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="2.7.2" targetFramework="net452" />
-  <package id="NUnit" version="3.4.1" targetFramework="net452" />
+  <package id="NUnit" version="3.7.1" targetFramework="net452" />
 </packages>
\ No newline at end of file