diff --git a/coriolisclient/cli/endpoint_instances.py b/coriolisclient/cli/endpoint_instances.py
index 749a94b..5d2ac5b 100644
--- a/coriolisclient/cli/endpoint_instances.py
+++ b/coriolisclient/cli/endpoint_instances.py
@@ -103,6 +103,11 @@ def get_parser(self, prog_name):
         parser.add_argument(
             '--name',
             help='Filter results based on regular expression search')
+        parser.add_argument(
+            '--refresh',
+            action='store_true',
+            default=False,
+            help='Force refresh of cached instance data')
 
         cli_utils.add_args_for_json_option_to_parser(parser, 'environment')
 
@@ -116,7 +121,8 @@ def take_action(self, args):
             args, 'environment', error_on_no_value=False)
 
         obj_list = ei.list(
-            endpoint_id, env, args.marker, args.limit, args.name)
+            endpoint_id, env, args.marker, args.limit, args.name,
+            refresh=args.refresh)
         return EndpointInstanceFormatter().list_objects(obj_list)
 
 
diff --git a/coriolisclient/tests/cli/test_endpoint_instances.py b/coriolisclient/tests/cli/test_endpoint_instances.py
index 6f30705..4a0ce2c 100644
--- a/coriolisclient/tests/cli/test_endpoint_instances.py
+++ b/coriolisclient/tests/cli/test_endpoint_instances.py
@@ -134,6 +134,7 @@ def test_take_action(
         args.marker = mock.sentinel.marker
         args.limit = mock.sentinel.limit
         args.name = mock.sentinel.name
+        args.refresh = mock.sentinel.refresh
         mock_endpoints = mock.Mock()
         mock_ei = mock.Mock()
         self.mock_app.client_manager.coriolis.endpoints = mock_endpoints
@@ -152,7 +153,8 @@ def test_take_action(
             mock_get_option_value_from_args.return_value,
             mock.sentinel.marker,
             mock.sentinel.limit,
-            mock.sentinel.name
+            mock.sentinel.name,
+            refresh=mock.sentinel.refresh,
         )
         mock_list_objects.assert_called_once_with(mock_ei.list.return_value)
 
diff --git a/coriolisclient/v1/endpoint_instances.py b/coriolisclient/v1/endpoint_instances.py
index 4a62a55..de5a1fa 100644
--- a/coriolisclient/v1/endpoint_instances.py
+++ b/coriolisclient/v1/endpoint_instances.py
@@ -33,7 +33,7 @@ def __init__(self, api):
 
     def list(
             self, endpoint, env=None, marker=None,
-            limit=None, name=None):
+            limit=None, name=None, refresh=False):
 
         query = {}
         if marker is not None:
@@ -42,6 +42,8 @@ def list(
             query['limit'] = limit
         if name is not None:
             query["name"] = name
+        if refresh:
+            query['refresh'] = 'true'
         if env is not None:
             if not isinstance(env, dict):
                 raise ValueError("'env' param must be a dict")