diff --git a/osmclient/cli_commands/nslcm.py b/osmclient/cli_commands/nslcm.py
index 719da83..d206db2 100755
--- a/osmclient/cli_commands/nslcm.py
+++ b/osmclient/cli_commands/nslcm.py
@@ -139,72 +139,17 @@
     )
 
 
-def process_update_params(ctx, param, value):
-    update_dict = {}
-    args = value
-    for i in range(len(args)):
-        if args[i].lower() == "--updatetype":
-            if i + 1 >= len(args) or args[i + 1].startswith("--"):
-                raise ClientException("No updateType is provided")
-            else:
-                update_dict["updateType"] = args[i + 1]
-            if update_dict.get("updateType") == "OPERATE_VNF":
-                if i + 2 >= len(args) or args[i + 2].startswith("--"):
-                    raise ClientException(
-                        "Whether the operate vnf is start,stop or rebuild needs to be specified"
-                    )
-                else:
-                    update_dict["changeStateTo"] = args[i + 2]
-        if args[i] == "--vdu":
-            if i + 1 >= len(args) or args[i + 1].startswith("--"):
-                raise ClientException("No vdu-id is provided")
-            else:
-                update_dict["vdu_id"] = args[i + 1]
-        elif args[i] == "--count-index":
-            if i + 1 >= len(args) or args[i + 1].startswith("--"):
-                raise ClientException("No count-index is provided")
-            else:
-                update_dict["count-index"] = int(args[i + 1])
-        elif args[i] == "--run-day1":
-            if i + 1 >= len(args) or args[i + 1].startswith("--"):
-                raise ClientException("No count-index is provided")
-            else:
-                update_dict["run-day1"] = True
-        elif args[i] == "--vnf":
-            if i + 1 >= len(args) or args[i + 1].startswith("--"):
-                raise ClientException("No vnf is provided")
-            else:
-                update_dict["vnfInstanceId"] = args[i + 1]
-        elif args[i] == "--vnfd-name":
-            if i + 1 >= len(args) or args[i + 1].startswith("--"):
-                raise ClientException("No vnf is provided")
-            else:
-                update_dict["vnfdId"] = args[i + 1]
-    if not update_dict.get("updateType"):
-        raise ClientException("updateType should be specified")
-    allowed_update_types = (
-        "CHANGE_VNFPKG",
-        "REMOVE_VNF",
-        "OPERATE_VNF",
-        "VERTICAL_SCALE",
-    )
-    if update_dict["updateType"] not in allowed_update_types:
-        raise ClientException(
-            f"updateType should be one of the allowed types: {allowed_update_types}"
-        )
-    ctx.params["update_params"] = update_dict
-    return
-
-
-@click.command(
-    name="ns-update",
-    context_settings=dict(
-        ignore_unknown_options=True,
-    ),
+@click.command(name="ns-update", short_help="executes an update of a Network Service.")
+@click.argument("ns_name")
+@click.option(
+    "--updatetype", required=True, type=str, help="available types: CHANGE_VNFPKG"
 )
-@click.argument("ns_name", required=True)
-@click.argument(
-    "args", nargs=-1, type=click.UNPROCESSED, callback=process_update_params
+@click.option(
+    "--config",
+    required=True,
+    type=str,
+    help="extra information for update operation as YAML/JSON inline string as --config"
+    " '{changeVnfPackageData:[{vnfInstanceId: xxx, vnfdId: yyy}]}'",
 )
 @click.option(
     "--timeout", required=False, default=None, type=int, help="timeout in seconds"
@@ -217,84 +162,26 @@
     help="do not return the control immediately, but keep it until the operation is completed, or timeout",
 )
 @click.pass_context
-def ns_update(ctx, ns_name, args, update_params, timeout, wait):
-    """NS-Update - updates based on the updateType
-    NS_NAME: name or ID of the NS instance
+def ns_update(ctx, ns_name, updatetype, config, timeout, wait):
+    """Executes an update of a Network Service.
 
-    updateType:CHANGEVNF_PKG
+    The update will check new revisions of the Network Functions that are part of the
+    Network Service, and it will update them if needed.
+    Sample update command: osm ns-update  ns_instance_id --updatetype CHANGE_VNFPKG
+    --config '{changeVnfPackageData: [{vnfInstanceId: id_x,vnfdId: id_y}]}' --timeout 300 --wait
 
-    \b
-    Options:
-      --updateType      CHANGE_VNFPKG
-      --vnf             VNF instance ID or VNF id in the NS [required]
-      --vnfd-name       VNFD ID or VNFD name [required]
-
-    updateType:REMOVE_VNF
-
-    \b
-    Options:
-      --updateType      REMOVE_VNF
-      --vnf             VNF instance ID or VNF id in the NS [required]
-
-    updateType:OPERATE_VNF
-
-    \b
-    Options:
-      --updateType      OPERATE_VNF (start, stop or rebuild) [required]
-      --vnf             VNF instance ID or VNF id in the NS [required]
-      --vdu             VDU-ID which should be operated [required]
-      --count-index     count-index of the specfied VDU-ID [0 by Default]
-      --run-day1        True or False to run day1 operations [False by Default]
-
-    \b
-    Options:
-      --updateType      VERTICAL_SCALE
-      --vnf             VNF instance ID or VNF id in the NS [required]
-      --vnfd-name       VNFD ID or VNFD name [required]
-      --vdu             VDU-ID which should be vertical scaled [required]
-
-    \b
-    Example:
-
-    updateType: CHANGE_VNFPKG
-
-    osm ns-update NS_NAME|NS_ID --updateType CHANGE_VNFPKG --vnf MEMBER_VNF_INDEX|VNFINSTANCEID  --vnfd-name VNFDID|VNFD_NAME
-
-    updateType: REMOVE_VNF
-
-    osm ns-update NS_NAME|NS_ID --updateType REMOVE_VNF --vnf MEMBER_VNF_INDEX|VNFINSTANCEID
-
-    updateType: OPERATE_VNF
-
-    osm ns-update NS_NAME|NS_ID --updateType OPERATE_VNF (start, stop or rebuild) --vdu VDUID --count-index COUNT_INDEX
-                                    --run-day1 True|False --vnf MEMBER_VNF_INDEX|VNFINSTANCEID
-
-    updateType: VERTICAL_SCALE
-
-    osm ns-update NS_NAME|NS_ID --updateType VERTICAL_SCALE --vnf MEMBER_VNF_INDEX|VNFINSTANCEID --vnfd-name VNFDID|VNFD_NAME
-                                    --vdu VDUID
+    NS_NAME: Network service instance name or ID.
 
     """
-    params = ctx.params["update_params"]
-    vnf_id = params["vnfInstanceId"]
-    if params.get("vnfdId"):
-        if not validate_uuid4(params.get("vnfdId")):
-            vnfd_list = ctx.obj.vnfd.get(params.get("vnfdId"))
-            params["vnfdId"] = vnfd_list["_id"]
-        else:
-            params["vnfdId"] = params["vnfdId"]
-    if not validate_uuid4(vnf_id):
-        vnf_filter = f"member-vnf-index-ref={vnf_id}"
-        vnf_list = ctx.obj.vnf.list(ns=ns_name, filter=vnf_filter)
-        if len(vnf_list) == 0:
-            raise ClientException(
-                f"No VNF found in NS {ns_name} with filter {vnf_filter}"
-            )
-        elif len(vnf_list) == 1:
-            params["vnfInstanceId"] = vnf_list[0]["_id"]
-    params["timeout"] = timeout
+    op_data = {
+        "timeout": timeout,
+        "updateType": updatetype,
+    }
+    if config:
+        op_data["config"] = yaml.safe_load(config)
+
     utils.check_client_version(ctx.obj, ctx.command.name)
-    ctx.obj.ns.update(ns_name, params, wait=wait)
+    ctx.obj.ns.update(ns_name, op_data, wait=wait)
 
 
 def process_common_heal_params(heal_vnf_dict, args):
diff --git a/osmclient/sol005/ns.py b/osmclient/sol005/ns.py
index d2be850..29232c1 100644
--- a/osmclient/sol005/ns.py
+++ b/osmclient/sol005/ns.py
@@ -541,33 +541,21 @@
 
             # Check update parameters availability according to update type
             if op_data["updateType"] == "CHANGE_VNFPKG":
-                op_data["changeVnfPackageData"] = {}
-                op_data["changeVnfPackageData"]["vnfInstanceId"] = data.get(
-                    "vnfInstanceId"
-                )
-                op_data["changeVnfPackageData"]["vnfdId"] = data.get("vnfdId")
-            elif op_data["updateType"] == "REMOVE_VNF":
-                op_data["removeVnfInstanceId"] = data.get("vnfInstanceId")
-            elif op_data["updateType"] == "OPERATE_VNF":
-                op_data["operateVnfData"] = {}
-                op_data["operateVnfData"]["vnfInstanceId"] = data.get("vnfInstanceId")
-                op_data["operateVnfData"]["changeStateTo"] = data.get("changeStateTo")
-                op_data["operateVnfData"]["additionalParam"] = {}
-                op_data["operateVnfData"]["additionalParam"]["vdu_id"] = data.get(
-                    "vdu_id"
-                )
-                op_data["operateVnfData"]["additionalParam"]["count-index"] = data.get(
-                    "count-index", 0
-                )
-                op_data["operateVnfData"]["additionalParam"]["run-day1"] = data.get(
-                    "run-day1", False
-                )
-            elif op_data["updateType"] == "VERTICAL_SCALE":
-                op_data["verticalScaleVnf"] = {}
-                op_data["verticalScaleVnf"]["vnfInstanceId"] = data.get("vnfInstanceId")
-                op_data["verticalScaleVnf"]["vnfdId"] = data.get("vnfdId")
-                op_data["verticalScaleVnf"]["vduId"] = data.get("vdu_id")
-                op_data["verticalScaleVnf"]["countIndex"] = 0
+                if not (
+                    data["config"]["changeVnfPackageData"][0].get("vnfInstanceId")
+                    and data["config"]["changeVnfPackageData"][0].get("vnfdId")
+                ):
+                    raise ClientException("you must set both vnfInstanceId and vnfdId")
+
+            # Fill up op_data
+            op_data["changeVnfPackageData"] = {}
+            op_data["changeVnfPackageData"]["vnfInstanceId"] = data["config"][
+                "changeVnfPackageData"
+            ][0].get("vnfInstanceId")
+
+            op_data["changeVnfPackageData"]["vnfdId"] = data["config"][
+                "changeVnfPackageData"
+            ][0].get("vnfdId")
 
             if data.get("timeout"):
                 op_data["timeout_ns_update"] = data["timeout"]