diff --git a/src/FhirOperationDefinitionGen.Tests/FhirOperationDefinitionGen.Tests.csproj b/src/FhirOperationDefinitionGen.Tests/FhirOperationDefinitionGen.Tests.csproj
index 70d0a55..c78c6ad 100644
--- a/src/FhirOperationDefinitionGen.Tests/FhirOperationDefinitionGen.Tests.csproj
+++ b/src/FhirOperationDefinitionGen.Tests/FhirOperationDefinitionGen.Tests.csproj
@@ -12,7 +12,7 @@
 
   <ItemGroup>
     <PackageReference Include="Hl7.Fhir.R4" Version="5.7.0" />
-    <PackageReference Include="FluentAssertions" Version="6.12.0" />
+    <PackageReference Include="FluentAssertions" Version="8.9.0" />
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.7.1" />
     <PackageReference Include="Verify.XUnit" Version="20.8.2" />
     <PackageReference Include="Verify.SourceGenerators" Version="2.2.0" />
diff --git a/src/FhirParametersGenerator.Tests/FhirParametersGenerator.Tests.csproj b/src/FhirParametersGenerator.Tests/FhirParametersGenerator.Tests.csproj
index 0adb136..f0b8563 100644
--- a/src/FhirParametersGenerator.Tests/FhirParametersGenerator.Tests.csproj
+++ b/src/FhirParametersGenerator.Tests/FhirParametersGenerator.Tests.csproj
@@ -13,7 +13,7 @@
 
   <ItemGroup>
     <PackageReference Include="Hl7.Fhir.R4" Version="5.7.0" />
-    <PackageReference Include="FluentAssertions" Version="6.12.0" />
+    <PackageReference Include="FluentAssertions" Version="8.9.0" />
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.9.0" />
     <PackageReference Include="Verify.XUnit" Version="19.14.1" />
     <PackageReference Include="Verify.SourceGenerators" Version="2.2.0" />