diff --git a/tests/Directory.Build.props b/tests/Directory.Build.props
index 0f7f048..fee7e21 100644
--- a/tests/Directory.Build.props
+++ b/tests/Directory.Build.props
@@ -16,7 +16,7 @@
     <PackageReference Include="NUnit" Version="3.14.0" />
     <PackageReference Include="NUnit3TestAdapter" Version="4.5.0" PrivateAssets="all" />
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.8.0" />
-    <PackageReference Include="NSubstitute" Version="5.1.0" />
+    <PackageReference Include="NSubstitute" Version="5.3.0" />
     <PackageReference Include="NunitXml.TestLogger" Version="3.1.15" />
   </ItemGroup>
 </Project>