diff --git a/dotnet/tests/JsonStructure.Tests/JsonStructure.Tests.csproj b/dotnet/tests/JsonStructure.Tests/JsonStructure.Tests.csproj
index 2f5a6c3..4e274a4 100644
--- a/dotnet/tests/JsonStructure.Tests/JsonStructure.Tests.csproj
+++ b/dotnet/tests/JsonStructure.Tests/JsonStructure.Tests.csproj
@@ -19,7 +19,7 @@
       <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
       <PrivateAssets>all</PrivateAssets>
     </PackageReference>
-    <PackageReference Include="FluentAssertions" Version="6.12.0" />
+    <PackageReference Include="FluentAssertions" Version="8.9.0" />
     <PackageReference Include="Xunit.SkippableFact" Version="1.5.61" />
   </ItemGroup>