diff --git a/examples/benchmarks/CatBoost/workflow_config_catboost.yaml b/examples/benchmarks/CatBoost/workflow_config_catboost.yaml
index 0ae0d95b2..720599be5 100644
--- a/examples/benchmarks/CatBoost/workflow_config_catboost.yaml
+++ b/examples/benchmarks/CatBoost/workflow_config_catboost.yaml
@@ -35,8 +35,8 @@ task:
             max_depth: 6
             num_leaves: 100
             thread_count: 20
-            grow_policy: 'Lossguide',
-            boostrap_type: 'Poisson'
+            grow_policy: Lossguide
+            boostrap_type: Poisson
     dataset:
         class: DatasetH
         module_path: qlib.data.dataset