diff --git a/nfa-to-dfa-conversion.Tests/nfa-to-dfa-conversion.Tests.csproj b/nfa-to-dfa-conversion.Tests/nfa-to-dfa-conversion.Tests.csproj
index 5d38094..f81fe94 100644
--- a/nfa-to-dfa-conversion.Tests/nfa-to-dfa-conversion.Tests.csproj
+++ b/nfa-to-dfa-conversion.Tests/nfa-to-dfa-conversion.Tests.csproj
@@ -8,7 +8,7 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="nunit" Version="3.14.0" />
+    <PackageReference Include="nunit" Version="4.0.0" />
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.8.0" />
     <PackageReference Include="NUnit3TestAdapter" Version="4.5.0" />
   </ItemGroup>