diff --git a/kedro_vertexai/config.py b/kedro_vertexai/config.py
index 21284e6..d32a9f9 100644
--- a/kedro_vertexai/config.py
+++ b/kedro_vertexai/config.py
@@ -2,7 +2,7 @@
 import os
 from importlib import import_module
 from inspect import signature
-from typing import Dict, List, Optional, Union
+from typing import Dict, List, Optional
 
 from pydantic import BaseModel, validator
 from pydantic.networks import IPvAnyAddress
@@ -218,7 +218,7 @@ class ScheduleConfig(BaseModel):
     start_time: Optional[str] = None
     end_time: Optional[str] = None
     allow_queueing: Optional[bool] = False
-    max_run_count: Optional[Union[int, None]] = None
+    max_run_count: Optional[int] = None
     max_concurrent_run_count: Optional[int] = 1
 
 
@@ -238,7 +238,7 @@ class RunConfig(BaseModel):
     node_selectors: Optional[Dict[str, Dict[str, str]]] = {}
     dynamic_config_providers: Optional[List[DynamicConfigProviderConfig]] = []
     mlflow: Optional[MLFlowVertexAIConfig] = None
-    schedules: Dict[str, ScheduleConfig]
+    schedules: Optional[Dict[str, ScheduleConfig]] = None
 
     def resources_for(self, node: str, tags: Optional[set] = None):
         default_config = self.resources["__default__"].dict()
diff --git a/tests/test_config.py b/tests/test_config.py
index b0629cc..847b06d 100644
--- a/tests/test_config.py
+++ b/tests/test_config.py
@@ -31,6 +31,15 @@
     size: 3Gi
     access_modes: [ReadWriteOnce]
     keep: True
+#   schedules:
+#     default_schedule:
+#       cron_expression: "0 * * * *"
+#       timezone: Etc/UTC
+#       start_time: null
+#       end_time: null
+#       allow_queueing: false
+#       max_run_count: null
+#       max_concurrent_run_count: 1
   mlflow:
     request_header_provider_params:
       service_account: test@example.com
diff --git a/tests/test_vertex_ai_client.py b/tests/test_vertex_ai_client.py
index aae7985..925014f 100644
--- a/tests/test_vertex_ai_client.py
+++ b/tests/test_vertex_ai_client.py
@@ -9,9 +9,7 @@
 
 
 class TestVertexAIClient(unittest.TestCase):
-    @patch("kedro_vertexai.client.CloudSchedulerClient")
-    def create_client(self, cloud_scheduler_client_mock):
-        self.cloud_scheduler_client_mock = cloud_scheduler_client_mock.return_value
+    def create_client(self):
         config = PluginConfig.parse_obj(
             {
                 "project_id": "PROJECT_ID",