diff --git a/Google.Authenticator.Tests/Google.Authenticator.Tests.csproj b/Google.Authenticator.Tests/Google.Authenticator.Tests.csproj
index 6aead4b..d31ac1d 100644
--- a/Google.Authenticator.Tests/Google.Authenticator.Tests.csproj
+++ b/Google.Authenticator.Tests/Google.Authenticator.Tests.csproj
@@ -12,7 +12,7 @@
 
   <ItemGroup>
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.3.0" />
-    <PackageReference Include="Shouldly" Version="3.0.2" />
+    <PackageReference Include="Shouldly" Version="4.0.3" />
     <PackageReference Include="xunit" Version="2.4.2" />
     <PackageReference Include="xunit.runner.visualstudio" Version="2.4.5">
       <PrivateAssets>all</PrivateAssets>