diff --git a/projects/BFDR.Messaging/BFDR.Messaging.csproj b/projects/BFDR.Messaging/BFDR.Messaging.csproj
index 895b7579..47917e91 100644
--- a/projects/BFDR.Messaging/BFDR.Messaging.csproj
+++ b/projects/BFDR.Messaging/BFDR.Messaging.csproj
@@ -13,7 +13,7 @@
     <PayloadVersionID>BFDR_STU2_0</PayloadVersionID>
   </PropertyGroup>
   <ItemGroup>
-    <PackageReference Include="Hl7.Fhir.R4" Version="4.3.0" />
+    <PackageReference Include="Hl7.Fhir.R4" Version="5.11.1" />
     <!-- <PackageReference Include="Vsxmd" Version="1.4.2">
       <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
       <PrivateAssets>all</PrivateAssets>
diff --git a/projects/BFDR/BFDR.csproj b/projects/BFDR/BFDR.csproj
index e3ab1707..7fa7b8f5 100644
--- a/projects/BFDR/BFDR.csproj
+++ b/projects/BFDR/BFDR.csproj
@@ -14,7 +14,7 @@
     <GeneratePackageOnBuild>true</GeneratePackageOnBuild>
   </PropertyGroup>
   <ItemGroup>
-    <PackageReference Include="Hl7.Fhir.R4" Version="4.3.0" />
+    <PackageReference Include="Hl7.Fhir.R4" Version="5.11.1" />
     <PackageReference Include="Microsoft.CSharp" Version="4.7.0" />
     <ProjectReference Include="../VitalRecord/VitalRecord.csproj" />
     <!-- <PackageReference Include="Vsxmd" Version="1.4.5">
diff --git a/projects/VRDR.Client/VRDR.Client.csproj b/projects/VRDR.Client/VRDR.Client.csproj
index 1cd55ae5..0cd02ecd 100644
--- a/projects/VRDR.Client/VRDR.Client.csproj
+++ b/projects/VRDR.Client/VRDR.Client.csproj
@@ -17,7 +17,7 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="Hl7.Fhir.R4" Version="4.3.0" />
+    <PackageReference Include="Hl7.Fhir.R4" Version="5.11.1" />
   </ItemGroup>
 
   <ItemGroup>
diff --git a/projects/VRDR.Messaging/VRDR.Messaging.csproj b/projects/VRDR.Messaging/VRDR.Messaging.csproj
index adafa58f..3455595f 100644
--- a/projects/VRDR.Messaging/VRDR.Messaging.csproj
+++ b/projects/VRDR.Messaging/VRDR.Messaging.csproj
@@ -13,7 +13,7 @@
     <PayloadVersionID>VRDR_STU3_0</PayloadVersionID>
   </PropertyGroup>
   <ItemGroup>
-    <PackageReference Include="Hl7.Fhir.R4" Version="4.3.0" />
+    <PackageReference Include="Hl7.Fhir.R4" Version="5.11.1" />
   </ItemGroup>
   <ItemGroup>
     <ProjectReference Include="..\VRDR\VRDR.csproj" />
diff --git a/projects/VRDR/VRDR.csproj b/projects/VRDR/VRDR.csproj
index b629fc93..11549a17 100644
--- a/projects/VRDR/VRDR.csproj
+++ b/projects/VRDR/VRDR.csproj
@@ -14,7 +14,7 @@
     <GeneratePackageOnBuild>true</GeneratePackageOnBuild>
   </PropertyGroup>
   <ItemGroup>
-    <PackageReference Include="Hl7.Fhir.R4" Version="4.3.0" />
+    <PackageReference Include="Hl7.Fhir.R4" Version="5.11.1" />
     <PackageReference Include="Microsoft.CSharp" Version="4.7.0" />
     <ProjectReference Include="../VitalRecord/VitalRecord.csproj" />
     <!-- <PackageReference Include="Vsxmd" Version="1.4.5">
diff --git a/projects/VitalRecord.Messaging/VitalRecord.Messaging.csproj b/projects/VitalRecord.Messaging/VitalRecord.Messaging.csproj
index 3b0c9c81..a007099f 100644
--- a/projects/VitalRecord.Messaging/VitalRecord.Messaging.csproj
+++ b/projects/VitalRecord.Messaging/VitalRecord.Messaging.csproj
@@ -12,7 +12,7 @@
     <GeneratePackageOnBuild>true</GeneratePackageOnBuild>
   </PropertyGroup>
   <ItemGroup>
-    <PackageReference Include="Hl7.Fhir.R4" Version="4.3.0" />
+    <PackageReference Include="Hl7.Fhir.R4" Version="5.11.1" />
     <!-- <PackageReference Include="Vsxmd" Version="1.4.2">
       <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
       <PrivateAssets>all</PrivateAssets>
diff --git a/projects/VitalRecord/VitalRecord.csproj b/projects/VitalRecord/VitalRecord.csproj
index 93525c95..501ae8bb 100644
--- a/projects/VitalRecord/VitalRecord.csproj
+++ b/projects/VitalRecord/VitalRecord.csproj
@@ -14,7 +14,7 @@
     <GeneratePackageOnBuild>true</GeneratePackageOnBuild>
   </PropertyGroup>
   <ItemGroup>
-    <PackageReference Include="Hl7.Fhir.R4" Version="4.3.0" />
+    <PackageReference Include="Hl7.Fhir.R4" Version="5.11.1" />
     <PackageReference Include="Microsoft.CSharp" Version="4.7.0" />
   </ItemGroup>
 </Project>