diff --git a/Tests/Tests.csproj b/Tests/Tests.csproj
index 66a08d2..ec6ac8e 100644
--- a/Tests/Tests.csproj
+++ b/Tests/Tests.csproj
@@ -49,10 +49,6 @@
     <CodeAnalysisRuleSet>MinimumRecommendedRules.ruleset</CodeAnalysisRuleSet>
   </PropertyGroup>
   <ItemGroup>
-    <Reference Include="nunit.framework, Version=2.5.9.10348, Culture=neutral, PublicKeyToken=96d09a1eb7f44a77, processorArchitecture=MSIL">
-      <SpecificVersion>False</SpecificVersion>
-      <HintPath>lib\nunit.framework.dll</HintPath>
-    </Reference>
     <Reference Include="System" />
   </ItemGroup>
   <ItemGroup>
@@ -92,6 +88,14 @@
       <Name>InsertIcons</Name>
     </ProjectReference>
   </ItemGroup>
+  <ItemGroup>
+    <PackageReference Include="NUnit">
+      <Version>3.13.3</Version>
+    </PackageReference>
+    <PackageReference Include="NUnit3TestAdapter">
+      <Version>4.3.1</Version>
+    </PackageReference>
+  </ItemGroup>
   <Import Project="$(MSBuildToolsPath)\Microsoft.CSharp.targets" />
   <PropertyGroup>
     <PostBuildEvent>