diff --git a/test/Diffs.Test.csproj b/test/Diffs.Test.csproj
index 2283ebc..b5f1587 100644
--- a/test/Diffs.Test.csproj
+++ b/test/Diffs.Test.csproj
@@ -11,7 +11,7 @@
 
   <ItemGroup>
     <PackageReference Include="NUnit" Version="4.3.2" />
-    <PackageReference Include="NUnit.Analyzers" Version="4.8.1">
+    <PackageReference Include="NUnit.Analyzers" Version="4.9.1">
       <PrivateAssets>all</PrivateAssets>
       <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
     </PackageReference>