diff --git a/backend/DvbLiveBackend.UnitTests/DvbLiveBackend.UnitTests.csproj b/backend/DvbLiveBackend.UnitTests/DvbLiveBackend.UnitTests.csproj
index bbe9049d..691a5380 100644
--- a/backend/DvbLiveBackend.UnitTests/DvbLiveBackend.UnitTests.csproj
+++ b/backend/DvbLiveBackend.UnitTests/DvbLiveBackend.UnitTests.csproj
@@ -23,7 +23,7 @@
     </PropertyGroup>
 
     <ItemGroup>
-        <PackageReference Include="FluentAssertions" Version="6.8.0" />
+        <PackageReference Include="FluentAssertions" Version="8.9.0" />
         <PackageReference Include="Microsoft.Extensions.Configuration.Json" Version="7.0.0" />
         <PackageReference Include="Microsoft.Extensions.Hosting" Version="7.0.0" />
         <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.5.0-preview-20221221-03" />
diff --git a/backend/PublicTransportLines.IntegrationTests/PublicTransportLines.IntegrationTests.csproj b/backend/PublicTransportLines.IntegrationTests/PublicTransportLines.IntegrationTests.csproj
index 2514ac84..d8eb6048 100644
--- a/backend/PublicTransportLines.IntegrationTests/PublicTransportLines.IntegrationTests.csproj
+++ b/backend/PublicTransportLines.IntegrationTests/PublicTransportLines.IntegrationTests.csproj
@@ -23,7 +23,7 @@
     </PropertyGroup>
 
     <ItemGroup>
-        <PackageReference Include="FluentAssertions" Version="6.8.0" />
+        <PackageReference Include="FluentAssertions" Version="8.9.0" />
         <PackageReference Include="Microsoft.Extensions.Configuration.Json" Version="7.0.0" />
         <PackageReference Include="Microsoft.Extensions.Hosting" Version="7.0.0" />
         <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.5.0-preview-20221221-03" />
diff --git a/backend/TriasCommunication.IntegrationTests/TriasCommunication.IntegrationTests.csproj b/backend/TriasCommunication.IntegrationTests/TriasCommunication.IntegrationTests.csproj
index a88843c3..a83fc6a0 100644
--- a/backend/TriasCommunication.IntegrationTests/TriasCommunication.IntegrationTests.csproj
+++ b/backend/TriasCommunication.IntegrationTests/TriasCommunication.IntegrationTests.csproj
@@ -29,7 +29,7 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="FluentAssertions" Version="6.8.0" />
+    <PackageReference Include="FluentAssertions" Version="8.9.0" />
     <PackageReference Include="Microsoft.Extensions.Configuration.Json" Version="7.0.0" />
     <PackageReference Include="Microsoft.Extensions.Hosting" Version="7.0.0" />
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.5.0-preview-20221221-03" />
diff --git a/backend/TriasCommunication.UnitTests/TriasCommunication.UnitTests.csproj b/backend/TriasCommunication.UnitTests/TriasCommunication.UnitTests.csproj
index 7c70c57a..d6d09174 100644
--- a/backend/TriasCommunication.UnitTests/TriasCommunication.UnitTests.csproj
+++ b/backend/TriasCommunication.UnitTests/TriasCommunication.UnitTests.csproj
@@ -29,7 +29,7 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="FluentAssertions" Version="6.8.0" />
+    <PackageReference Include="FluentAssertions" Version="8.9.0" />
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.5.0-preview-20221221-03" />
     <PackageReference Include="Moq" Version="4.18.3" />
     <PackageReference Include="RichardSzalay.MockHttp" Version="6.0.0" />