diff --git a/tests/BaseTestCode/BaseTestCode.csproj b/tests/BaseTestCode/BaseTestCode.csproj
index 017314a7..fa0b5eeb 100644
--- a/tests/BaseTestCode/BaseTestCode.csproj
+++ b/tests/BaseTestCode/BaseTestCode.csproj
@@ -19,7 +19,7 @@
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     <PackageReference Include="AutoFixture.AutoNSubstitute" Version="4.18.1" />
     <PackageReference Include="AutoFixture.Xunit2" Version="4.18.1" />
-    <PackageReference Include="FluentAssertions" Version="6.12.0" />
+    <PackageReference Include="FluentAssertions" Version="8.5.0" />
     <PackageReference Include="Microsoft.Extensions.DependencyInjection" Version="8.0.0" />
     <PackageReference Include="Microsoft.Extensions.DependencyInjection.Abstractions" Version="8.0.1" />
     <PackageReference Include="Microsoft.Extensions.Http" Version="8.0.0" />
diff --git a/tests/Common.Tests/Common.Tests.csproj b/tests/Common.Tests/Common.Tests.csproj
index e3af54f5..57c497fd 100644
--- a/tests/Common.Tests/Common.Tests.csproj
+++ b/tests/Common.Tests/Common.Tests.csproj
@@ -19,7 +19,7 @@
     <PackageReference Include="AutoFixture" Version="4.18.1" />
     <PackageReference Include="AutoFixture.AutoNSubstitute" Version="4.18.1" />
     <PackageReference Include="AutoFixture.Xunit2" Version="4.18.1" />
-    <PackageReference Include="FluentAssertions" Version="6.12.0" />
+    <PackageReference Include="FluentAssertions" Version="8.5.0" />
     <PackageReference Include="Microsoft.Extensions.Http" Version="8.0.0" />
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.9.0" />
     <PackageReference Include="NSubstitute" Version="5.1.0" />
diff --git a/tests/Domain.Tests/Domain.Tests.csproj b/tests/Domain.Tests/Domain.Tests.csproj
index 027e0272..c7c11c03 100644
--- a/tests/Domain.Tests/Domain.Tests.csproj
+++ b/tests/Domain.Tests/Domain.Tests.csproj
@@ -20,7 +20,7 @@
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     <PackageReference Include="AutoFixture.Xunit2" Version="4.18.1" />
     <PackageReference Include="Blazor-State" Version="7.0.0" />
-    <PackageReference Include="FluentAssertions" Version="6.12.0" />
+    <PackageReference Include="FluentAssertions" Version="8.5.0" />
     <PackageReference Include="Microsoft.Extensions.Caching.Memory" Version="7.0.0" />
     <PackageReference Include="Microsoft.Extensions.Http" Version="8.0.0" />
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.9.0" />
diff --git a/tests/Experiment.Tests/Experiment.Tests.csproj b/tests/Experiment.Tests/Experiment.Tests.csproj
index 6df60356..38681a13 100644
--- a/tests/Experiment.Tests/Experiment.Tests.csproj
+++ b/tests/Experiment.Tests/Experiment.Tests.csproj
@@ -20,7 +20,7 @@
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     <PackageReference Include="AutoFixture.AutoNSubstitute" Version="4.18.1" />
     <PackageReference Include="AutoFixture.Xunit2" Version="4.18.1" />
-    <PackageReference Include="FluentAssertions" Version="6.12.0" />
+    <PackageReference Include="FluentAssertions" Version="8.5.0" />
     <PackageReference Include="Microsoft.AspNetCore.Mvc.Testing" Version="7.0.18" />
     <PackageReference Include="Microsoft.Extensions.Caching.Memory" Version="7.0.0" />
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.9.0" />