diff --git a/org.hl7.fhir.utilities/src/main/java/org/hl7/fhir/utilities/VersionUtilities.java b/org.hl7.fhir.utilities/src/main/java/org/hl7/fhir/utilities/VersionUtilities.java
index ce706d0fe..5cba7179a 100644
--- a/org.hl7.fhir.utilities/src/main/java/org/hl7/fhir/utilities/VersionUtilities.java
+++ b/org.hl7.fhir.utilities/src/main/java/org/hl7/fhir/utilities/VersionUtilities.java
@@ -71,6 +71,11 @@ public class VersionUtilities {
     if (isR4Ver(v)) {
       return "hl7.fhir.r4.core";
     }
+    
+    if (isR4BVer(v)) {
+      return "hl7.fhir.r4b.core";
+    }
+    
     if ("current".equals(v)) {
       return "hl7.fhir.r5.core";
     }
@@ -122,17 +127,21 @@ public class VersionUtilities {
   }
 
   public static boolean isSupportedVersion(String version) {
-    return Utilities.existsInList(version, "1.0.2", "1.4.0", "3.0.2", "4.0.1", CURRENT_FULL_VERSION);
+    return Utilities.existsInList(version, "1.0.2", "1.4.0", "3.0.2", "4.0.1", "4.1.0", CURRENT_FULL_VERSION);
   }
 
   public static String listSupportedVersions() {
-    return "1.0.2, 1.4.0, 3.0.2, 4.0.1, "+CURRENT_FULL_VERSION;
+    return "1.0.2, 1.4.0, 3.0.2, 4.0.1, 4.1.0, "+CURRENT_FULL_VERSION;
   }
 
   public static boolean isR5Ver(String ver) {
     return ver != null && ver.startsWith(CURRENT_VERSION);
   }
 
+  public static boolean isR4BVer(String ver) {
+    return ver != null && ver.startsWith("4.1");
+  }
+
   public static boolean isR4Ver(String ver) {
     return ver != null && ver.startsWith("4.0");
   }
diff --git a/org.hl7.fhir.utilities/src/main/java/org/hl7/fhir/utilities/npm/NpmPackage.java b/org.hl7.fhir.utilities/src/main/java/org/hl7/fhir/utilities/npm/NpmPackage.java
index 310872d96..ae3bc4039 100644
--- a/org.hl7.fhir.utilities/src/main/java/org/hl7/fhir/utilities/npm/NpmPackage.java
+++ b/org.hl7.fhir.utilities/src/main/java/org/hl7/fhir/utilities/npm/NpmPackage.java
@@ -719,7 +719,8 @@ public class NpmPackage {
   public String fhirVersion() {
     if ("hl7.fhir.core".equals(JSONUtil.str(npm, "name")))
       return JSONUtil.str(npm, "version");
-    else if (JSONUtil.str(npm, "name").startsWith("hl7.fhir.r2.") || JSONUtil.str(npm, "name").startsWith("hl7.fhir.r2b.") || JSONUtil.str(npm, "name").startsWith("hl7.fhir.r3.") || JSONUtil.str(npm, "name").startsWith("hl7.fhir.r4.") || JSONUtil.str(npm, "name").startsWith("hl7.fhir.r5."))
+    else if (JSONUtil.str(npm, "name").startsWith("hl7.fhir.r2.") || JSONUtil.str(npm, "name").startsWith("hl7.fhir.r2b.") || JSONUtil.str(npm, "name").startsWith("hl7.fhir.r3.") || 
+          JSONUtil.str(npm, "name").startsWith("hl7.fhir.r4.") || JSONUtil.str(npm, "name").startsWith("hl7.fhir.r4b.") || JSONUtil.str(npm, "name").startsWith("hl7.fhir.r5."))
       return JSONUtil.str(npm, "version");
     else {        
       JsonObject dep = npm.getAsJsonObject("dependencies");