diff --git a/src/TestHelper/TestHelper.csproj b/src/TestHelper/TestHelper.csproj
index 84e3b6fd..c10f496d 100644
--- a/src/TestHelper/TestHelper.csproj
+++ b/src/TestHelper/TestHelper.csproj
@@ -6,7 +6,7 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="NUnit" Version="3.14.0" />
+    <PackageReference Include="NUnit" Version="5.0.0" />
     <PackageReference Include="NUnit.Analyzers" Version="4.15.0" />
   </ItemGroup>
 
diff --git a/src/TimeoutMigrationTool.Tests/TimeoutMigrationTool.Tests.csproj b/src/TimeoutMigrationTool.Tests/TimeoutMigrationTool.Tests.csproj
index e002a518..37965d80 100644
--- a/src/TimeoutMigrationTool.Tests/TimeoutMigrationTool.Tests.csproj
+++ b/src/TimeoutMigrationTool.Tests/TimeoutMigrationTool.Tests.csproj
@@ -11,7 +11,7 @@
   <ItemGroup>
     <PackageReference Include="GitHubActionsTestLogger" Version="3.0.5" />
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="18.11.0" />
-    <PackageReference Include="NUnit" Version="3.14.0" />
+    <PackageReference Include="NUnit" Version="5.0.0" />
     <PackageReference Include="NUnit.Analyzers" Version="4.15.0" />
     <PackageReference Include="NUnit3TestAdapter" Version="6.3.1" />
   </ItemGroup>