diff --git a/src/Yaclp.Tests.WhiteBox/Yaclp.Tests.WhiteBox.csproj b/src/Yaclp.Tests.WhiteBox/Yaclp.Tests.WhiteBox.csproj
index e5f0abe..722cf4a 100644
--- a/src/Yaclp.Tests.WhiteBox/Yaclp.Tests.WhiteBox.csproj
+++ b/src/Yaclp.Tests.WhiteBox/Yaclp.Tests.WhiteBox.csproj
@@ -8,7 +8,7 @@
 
   <ItemGroup>
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="16.1.1" />
-    <PackageReference Include="Shouldly" Version="3.0.2" />
+    <PackageReference Include="Shouldly" Version="4.0.3" />
     <PackageReference Include="xunit" Version="2.4.1" />
     <PackageReference Include="xunit.runner.visualstudio" Version="2.4.1" />
   </ItemGroup>