diff --git a/Tests/Tests.csproj b/Tests/Tests.csproj
index 90d4469..f45051c 100644
--- a/Tests/Tests.csproj
+++ b/Tests/Tests.csproj
@@ -13,7 +13,7 @@
   <ItemGroup>
     <PackageReference Include="Microsoft.CSharp" Version="4.7.0" />
     <PackageReference Include="NUnit">
-      <Version>3.14.0</Version>
+      <Version>4.0.1</Version>
     </PackageReference>
     <PackageReference Include="NUnit3TestAdapter">
       <Version>4.5.0</Version>