diff --git a/src/Spark.Engine/Spark.Engine.csproj b/src/Spark.Engine/Spark.Engine.csproj
index 52d1445c2..e846c40a3 100644
--- a/src/Spark.Engine/Spark.Engine.csproj
+++ b/src/Spark.Engine/Spark.Engine.csproj
@@ -15,6 +15,7 @@
 
     <ItemGroup>
         <PackageReference Include="Fhir.Metrics" Version="1.3.1" />
+        <PackageReference Include="Hl7.Fhir.Base" Version="6.0.1" />
         <PackageReference Include="Hl7.Fhir.R4" Version="5.12.2" />
     </ItemGroup>
 
diff --git a/src/Spark.Mongo/Spark.Mongo.csproj b/src/Spark.Mongo/Spark.Mongo.csproj
index 8195c04bc..ca18821b2 100644
--- a/src/Spark.Mongo/Spark.Mongo.csproj
+++ b/src/Spark.Mongo/Spark.Mongo.csproj
@@ -10,7 +10,7 @@
     </PropertyGroup>
 
     <ItemGroup>
-        <PackageReference Include="Hl7.Fhir.Base" Version="5.12.2" />
+        <PackageReference Include="Hl7.Fhir.Base" Version="6.0.1" />
         <PackageReference Include="MongoDB.Driver" Version="3.5.0" />
     </ItemGroup>