diff --git a/csharp/csharp.csproj b/csharp/csharp.csproj
index 499f9202..58213647 100644
--- a/csharp/csharp.csproj
+++ b/csharp/csharp.csproj
@@ -48,9 +48,8 @@
       <HintPath>packages\ApprovalUtilities.3.0.13\lib\net45\ApprovalUtilities.Net45.dll</HintPath>
       <Private>True</Private>
     </Reference>
-    <Reference Include="nunit.framework, Version=3.8.1.0, Culture=neutral, PublicKeyToken=2638cd05610744eb, processorArchitecture=MSIL">
-      <HintPath>packages\NUnit.3.8.1\lib\net45\nunit.framework.dll</HintPath>
-      <Private>True</Private>
+    <Reference Include="nunit.framework, Version=3.9.0.0, Culture=neutral, PublicKeyToken=2638cd05610744eb, processorArchitecture=MSIL">
+      <HintPath>packages\NUnit.3.9.0\lib\net45\nunit.framework.dll</HintPath>
     </Reference>
     <Reference Include="System" />
     <Reference Include="System.Core" />
diff --git a/csharp/packages.config b/csharp/packages.config
index cab736e4..63895ed1 100644
--- a/csharp/packages.config
+++ b/csharp/packages.config
@@ -2,6 +2,6 @@
 <packages>
   <package id="ApprovalTests" version="3.0.13" targetFramework="net452" />
   <package id="ApprovalUtilities" version="3.0.13" targetFramework="net452" />
-  <package id="NUnit" version="3.8.1" targetFramework="net452" />
+  <package id="NUnit" version="3.9.0" targetFramework="net452" />
   <package id="NUnit3TestAdapter" version="3.9.0" targetFramework="net452" />
 </packages>
\ No newline at end of file