diff --git a/Bi5.Net.Tests/Bi5.Net.Tests.csproj b/Bi5.Net.Tests/Bi5.Net.Tests.csproj
index 3267175..52824c7 100644
--- a/Bi5.Net.Tests/Bi5.Net.Tests.csproj
+++ b/Bi5.Net.Tests/Bi5.Net.Tests.csproj
@@ -12,7 +12,7 @@
           <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
         </PackageReference>
         <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.11.1" />
-        <PackageReference Include="NSubstitute" Version="5.1.0" />
+        <PackageReference Include="NSubstitute" Version="5.3.0" />
         <PackageReference Include="System.Linq.Async" Version="6.0.1" />
         <PackageReference Include="xunit" Version="2.9.2" />
         <PackageReference Include="xunit.runner.visualstudio" Version="2.8.2">