diff --git a/GitDiffMargin.Unit.Tests/GitDiffMargin.Unit.Tests.csproj b/GitDiffMargin.Unit.Tests/GitDiffMargin.Unit.Tests.csproj
index 2daa7a9..3f9da26 100644
--- a/GitDiffMargin.Unit.Tests/GitDiffMargin.Unit.Tests.csproj
+++ b/GitDiffMargin.Unit.Tests/GitDiffMargin.Unit.Tests.csproj
@@ -42,7 +42,7 @@
     <PackageReference Include="NUnit3TestAdapter">
       <Version>3.15.1</Version>
     </PackageReference>
-    <PackageReference Include="Shouldly" Version="3.0.2" />
+    <PackageReference Include="Shouldly" Version="4.0.3" />
   </ItemGroup>
   <ItemGroup>
     <ProjectReference Include="..\GitDiffMargin\GitDiffMargin.csproj">