diff --git a/src/Hl7.Fhir.Specification.R4.Tests/Hl7.Fhir.Specification.R4.Tests.csproj b/src/Hl7.Fhir.Specification.R4.Tests/Hl7.Fhir.Specification.R4.Tests.csproj
index 74e7e05fb..021e19422 100644
--- a/src/Hl7.Fhir.Specification.R4.Tests/Hl7.Fhir.Specification.R4.Tests.csproj
+++ b/src/Hl7.Fhir.Specification.R4.Tests/Hl7.Fhir.Specification.R4.Tests.csproj
@@ -16,7 +16,7 @@
 
 	<ItemGroup>
 		<PackageReference Include="Newtonsoft.Json" Version="13.0.3" />
-		<PackageReference Include="System.Threading.Tasks.Dataflow" Version="8.0.1" />
+		<PackageReference Include="System.Threading.Tasks.Dataflow" Version="9.0.0" />
 	</ItemGroup>
 
 	<ItemGroup>
diff --git a/src/Hl7.Fhir.Specification.R4B.Tests/Hl7.Fhir.Specification.R4B.Tests.csproj b/src/Hl7.Fhir.Specification.R4B.Tests/Hl7.Fhir.Specification.R4B.Tests.csproj
index bf6ee48a1..2f04245b9 100644
--- a/src/Hl7.Fhir.Specification.R4B.Tests/Hl7.Fhir.Specification.R4B.Tests.csproj
+++ b/src/Hl7.Fhir.Specification.R4B.Tests/Hl7.Fhir.Specification.R4B.Tests.csproj
@@ -16,7 +16,7 @@
 
 	<ItemGroup>
 		<PackageReference Include="Newtonsoft.Json" Version="13.0.3" />
-		<PackageReference Include="System.Threading.Tasks.Dataflow" Version="8.0.1" />
+		<PackageReference Include="System.Threading.Tasks.Dataflow" Version="9.0.0" />
 	</ItemGroup>
 
 	<ItemGroup>
diff --git a/src/Hl7.Fhir.Specification.R5.Tests/Hl7.Fhir.Specification.R5.Tests.csproj b/src/Hl7.Fhir.Specification.R5.Tests/Hl7.Fhir.Specification.R5.Tests.csproj
index 0347d1234..0d7d8c18b 100644
--- a/src/Hl7.Fhir.Specification.R5.Tests/Hl7.Fhir.Specification.R5.Tests.csproj
+++ b/src/Hl7.Fhir.Specification.R5.Tests/Hl7.Fhir.Specification.R5.Tests.csproj
@@ -21,7 +21,7 @@
 
 	<ItemGroup>
 		<PackageReference Include="Newtonsoft.Json" Version="13.0.3" />
-		<PackageReference Include="System.Threading.Tasks.Dataflow" Version="8.0.1" />
+		<PackageReference Include="System.Threading.Tasks.Dataflow" Version="9.0.0" />
 	</ItemGroup>
 
 	<ItemGroup>
diff --git a/src/Hl7.Fhir.Support.Tests/Hl7.Fhir.Support.Tests.csproj b/src/Hl7.Fhir.Support.Tests/Hl7.Fhir.Support.Tests.csproj
index 205141ab7..e2092c30d 100644
--- a/src/Hl7.Fhir.Support.Tests/Hl7.Fhir.Support.Tests.csproj
+++ b/src/Hl7.Fhir.Support.Tests/Hl7.Fhir.Support.Tests.csproj
@@ -8,7 +8,7 @@
 
 	<ItemGroup>
 		<PackageReference Include="Newtonsoft.Json" Version="13.0.3" />
-		<PackageReference Include="System.Threading.Tasks.Dataflow" Version="8.0.1" />
+		<PackageReference Include="System.Threading.Tasks.Dataflow" Version="9.0.0" />
 	</ItemGroup>
 	
 	<ItemGroup>
diff --git a/src/Hl7.FhirPath.R4.Tests/Hl7.FhirPath.R4.Tests.csproj b/src/Hl7.FhirPath.R4.Tests/Hl7.FhirPath.R4.Tests.csproj
index d71bc3971..6994304a3 100644
--- a/src/Hl7.FhirPath.R4.Tests/Hl7.FhirPath.R4.Tests.csproj
+++ b/src/Hl7.FhirPath.R4.Tests/Hl7.FhirPath.R4.Tests.csproj
@@ -21,7 +21,7 @@
 
 	<ItemGroup>
 		<PackageReference Include="Newtonsoft.Json" Version="13.0.3" />
-		<PackageReference Include="System.Threading.Tasks.Dataflow" Version="8.0.1" />
+		<PackageReference Include="System.Threading.Tasks.Dataflow" Version="9.0.0" />
 	</ItemGroup>
 
 </Project>
\ No newline at end of file
diff --git a/src/Hl7.FhirPath.Tests/HL7.FhirPath.Tests.csproj b/src/Hl7.FhirPath.Tests/HL7.FhirPath.Tests.csproj
index 779dde0d3..91d190f31 100644
--- a/src/Hl7.FhirPath.Tests/HL7.FhirPath.Tests.csproj
+++ b/src/Hl7.FhirPath.Tests/HL7.FhirPath.Tests.csproj
@@ -9,7 +9,7 @@
 
 	<ItemGroup>
 		<PackageReference Include="Newtonsoft.Json" Version="13.0.3" />
-		<PackageReference Include="System.Threading.Tasks.Dataflow" Version="8.0.1" />
+		<PackageReference Include="System.Threading.Tasks.Dataflow" Version="9.0.0" />
 	</ItemGroup>
 
 	<ItemGroup>