diff --git a/mistralclient/api/v2/tasks.py b/mistralclient/api/v2/tasks.py
index ba632a6e..5236a1bb 100644
--- a/mistralclient/api/v2/tasks.py
+++ b/mistralclient/api/v2/tasks.py
@@ -22,15 +22,6 @@ class Task(base.Resource):
 class TaskManager(base.ResourceManager):
     resource_class = Task
 
-    def update(self, id, state):
-        self._ensure_not_empty(id=id, state=state)
-
-        data = {
-            'state': state
-        }
-
-        return self._update('/tasks/%s' % id, data)
-
     def list(self, workflow_execution_id=None):
         url = '/tasks'
 
diff --git a/mistralclient/commands/v2/tasks.py b/mistralclient/commands/v2/tasks.py
index cbe8f3e7..7854836c 100644
--- a/mistralclient/commands/v2/tasks.py
+++ b/mistralclient/commands/v2/tasks.py
@@ -52,11 +52,22 @@ def format(task=None):
 class List(base.MistralLister):
     """List all tasks."""
 
+    def get_parser(self, prog_name):
+        parser = super(List, self).get_parser(prog_name)
+
+        parser.add_argument(
+            'workflow_execution',
+            nargs='?',
+            help='Workflow execution ID associated with list of Tasks.')
+        return parser
+
     def _get_format_function(self):
         return format
 
     def _get_resources(self, parsed_args):
-        return tasks.TaskManager(self.app.client).list()
+        return tasks.TaskManager(self.app.client).list(
+            parsed_args.workflow_execution
+        )
 
 
 class Get(show.ShowOne):
@@ -77,30 +88,6 @@ class Get(show.ShowOne):
         return format(execution)
 
 
-class Update(show.ShowOne):
-    """Update task."""
-
-    def get_parser(self, prog_name):
-        parser = super(Update, self).get_parser(prog_name)
-
-        parser.add_argument(
-            'id',
-            help='Task identifier')
-        parser.add_argument(
-            'state',
-            choices=['IDLE', 'RUNNING', 'SUCCESS', 'ERROR'],
-            help='Task state')
-
-        return parser
-
-    def take_action(self, parsed_args):
-        execution = tasks.TaskManager(self.app.client).update(
-            parsed_args.id,
-            parsed_args.state)
-
-        return format(execution)
-
-
 class GetResult(command.Command):
     """Show task output data."""
 
diff --git a/mistralclient/shell.py b/mistralclient/shell.py
index db1baf22..fecb33df 100644
--- a/mistralclient/shell.py
+++ b/mistralclient/shell.py
@@ -285,7 +285,6 @@ class MistralShell(app.App):
             'task-get': mistralclient.commands.v2.tasks.Get,
             'task-get-input': mistralclient.commands.v2.tasks.GetInput,
             'task-get-result': mistralclient.commands.v2.tasks.GetResult,
-            'task-update': mistralclient.commands.v2.tasks.Update,
             'action-list': mistralclient.commands.v2.actions.List,
             'action-get': mistralclient.commands.v2.actions.Get,
             'action-create': mistralclient.commands.v2.actions.Create,
diff --git a/mistralclient/tests/unit/v2/test_cli_tasks.py b/mistralclient/tests/unit/v2/test_cli_tasks.py
index e32b36d7..c9ecdeef 100644
--- a/mistralclient/tests/unit/v2/test_cli_tasks.py
+++ b/mistralclient/tests/unit/v2/test_cli_tasks.py
@@ -44,16 +44,6 @@ TASK_WITH_INPUT = tasks.Task(mock, TASK_WITH_INPUT_DICT)
 
 
 class TestCLITasksV2(base.BaseCommandTest):
-    @mock.patch('mistralclient.api.v2.tasks.TaskManager.update')
-    def test_update(self, mock):
-        mock.return_value = TASK
-
-        result = self.call(task_cmd.Update,
-                           app_args=['id', 'ERROR'])
-
-        self.assertEqual(('123', 'some', 'thing', '321', 'RUNNING'),
-                         result[1])
-
     @mock.patch('mistralclient.api.v2.tasks.TaskManager.list')
     def test_list(self, mock):
         mock.return_value = (TASK,)
@@ -63,6 +53,15 @@ class TestCLITasksV2(base.BaseCommandTest):
         self.assertEqual([('123', 'some', 'thing', '321', 'RUNNING')],
                          result[1])
 
+    @mock.patch('mistralclient.api.v2.tasks.TaskManager.list')
+    def test_list_with_workflow_execution(self, mock):
+        mock.return_value = (TASK,)
+
+        result = self.call(task_cmd.List, app_args=['workflow_execution'])
+
+        self.assertEqual([('123', 'some', 'thing', '321', 'RUNNING')],
+                         result[1])
+
     @mock.patch('mistralclient.api.v2.tasks.TaskManager.get')
     def test_get(self, mock):
         mock.return_value = TASK
diff --git a/mistralclient/tests/unit/v2/test_tasks.py b/mistralclient/tests/unit/v2/test_tasks.py
index 06ccd745..a0ef459f 100644
--- a/mistralclient/tests/unit/v2/test_tasks.py
+++ b/mistralclient/tests/unit/v2/test_tasks.py
@@ -12,8 +12,6 @@
 #    See the License for the specific language governing permissions and
 #    limitations under the License.
 
-import json
-
 from mistralclient.api.v2 import tasks
 from mistralclient.tests.unit.v2 import base
 
@@ -25,7 +23,8 @@ TASK = {
     'name': 'my_task',
     'workflow_name': 'my_wf',
     'state': 'RUNNING',
-    'tags': ['deployment', 'demo']
+    'tags': ['deployment', 'demo'],
+    'result': {'some': 'result'}
 }
 
 
@@ -34,20 +33,6 @@ URL_TEMPLATE_ID = '/tasks/%s'
 
 
 class TestTasksV2(base.BaseClientV2Test):
-    def test_update(self):
-        mock = self.mock_http_put(content=TASK)
-        body = {
-            'state': TASK['state']
-        }
-
-        task = self.tasks.update(TASK['id'],
-                                 TASK['state'])
-
-        self.assertIsNotNone(task)
-        self.assertEqual(tasks.Task(self.tasks, TASK).__dict__, task.__dict__)
-        mock.assert_called_once_with(
-            URL_TEMPLATE_ID % TASK['id'], json.dumps(body))
-
     def test_list(self):
         mock = self.mock_http_get(content={'tasks': [TASK]})