diff --git a/src/TestHelper/TestHelper.csproj b/src/TestHelper/TestHelper.csproj
index 88359f4c..84e3b6fd 100644
--- a/src/TestHelper/TestHelper.csproj
+++ b/src/TestHelper/TestHelper.csproj
@@ -7,7 +7,7 @@
 
   <ItemGroup>
     <PackageReference Include="NUnit" Version="3.14.0" />
-    <PackageReference Include="NUnit.Analyzers" Version="4.6.0" />
+    <PackageReference Include="NUnit.Analyzers" Version="4.15.0" />
   </ItemGroup>
 
   <!-- Workaround to prevent VS test discovery error -->
diff --git a/src/TimeoutMigrationTool.NHibernate.AcceptanceTests/NHibernateAcceptanceTests.cs b/src/TimeoutMigrationTool.NHibernate.AcceptanceTests/NHibernateAcceptanceTests.cs
index 5b30cf03..72e79759 100644
--- a/src/TimeoutMigrationTool.NHibernate.AcceptanceTests/NHibernateAcceptanceTests.cs
+++ b/src/TimeoutMigrationTool.NHibernate.AcceptanceTests/NHibernateAcceptanceTests.cs
@@ -11,7 +11,7 @@
     using Particular.TimeoutMigrationTool.NHibernate;
     using System.Threading.Tasks;
 
-    class NHibernateAcceptanceTests
+    abstract class NHibernateAcceptanceTests
     {
         internal string connectionString;
 
diff --git a/src/TimeoutMigrationTool.NHibernate.OracleAcceptanceTests/NHibernateAcceptanceTests.cs b/src/TimeoutMigrationTool.NHibernate.OracleAcceptanceTests/NHibernateAcceptanceTests.cs
index 7e4456ad..a73b2ecd 100644
--- a/src/TimeoutMigrationTool.NHibernate.OracleAcceptanceTests/NHibernateAcceptanceTests.cs
+++ b/src/TimeoutMigrationTool.NHibernate.OracleAcceptanceTests/NHibernateAcceptanceTests.cs
@@ -11,7 +11,7 @@
     using System.IO;
     using System.Threading.Tasks;
 
-    class NHibernateAcceptanceTests
+    abstract class NHibernateAcceptanceTests
     {
         public NHibernateAcceptanceTests()
         {
diff --git a/src/TimeoutMigrationTool.Tests/TimeoutMigrationTool.Tests.csproj b/src/TimeoutMigrationTool.Tests/TimeoutMigrationTool.Tests.csproj
index 26399c62..e002a518 100644
--- a/src/TimeoutMigrationTool.Tests/TimeoutMigrationTool.Tests.csproj
+++ b/src/TimeoutMigrationTool.Tests/TimeoutMigrationTool.Tests.csproj
@@ -12,7 +12,7 @@
     <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.Analyzers" Version="4.6.0" />
+    <PackageReference Include="NUnit.Analyzers" Version="4.15.0" />
     <PackageReference Include="NUnit3TestAdapter" Version="6.3.1" />
   </ItemGroup>