diff --git a/joj3_config_generator/main.py b/joj3_config_generator/main.py
index 0e8cf95..519b4e2 100644
--- a/joj3_config_generator/main.py
+++ b/joj3_config_generator/main.py
@@ -37,7 +37,7 @@ def convert_joj1(yaml_path: Path, toml_path: Path) -> None:
     logger.info(f"Converting yaml file {yaml_path}")
     joj1_model = load_joj1_yaml(yaml_path)
     task_model = convert_joj1_conf(joj1_model)
-    result_dict = task_model.model_dump(by_alias=True, exclude_none=True)
+    result_dict = task_model.model_dump(mode="json", by_alias=True, exclude_none=True)
     toml_path.write_text(rtoml.dumps(result_dict))
 
 
@@ -65,7 +65,9 @@ def convert(
             )
             repo_conf, task_conf = load_joj3_toml(root, repo_toml_path, task_toml_path)
             result_model = convert_conf(repo_conf, task_conf)
-            result_dict = result_model.model_dump(by_alias=True, exclude_none=True)
+            result_dict = result_model.model_dump(
+                mode="json", by_alias=True, exclude_none=True
+            )
             with result_json_path.open("w") as result_file:
                 json.dump(result_dict, result_file, ensure_ascii=False, indent=4)
                 result_file.write("\n")
diff --git a/tests/convert_joj1/utils.py b/tests/convert_joj1/utils.py
index 74aa1b5..5352a84 100644
--- a/tests/convert_joj1/utils.py
+++ b/tests/convert_joj1/utils.py
@@ -1,23 +1,19 @@
 from pathlib import Path
-from typing import Any, Dict, Tuple
 
 import rtoml
-import yaml
 
 from joj3_config_generator.convert import convert_joj1
-from joj3_config_generator.models import joj1
-
-
-def read_convert_joj1_files(case_name: str) -> Tuple[joj1.Config, Dict[str, Any]]:
-    root = Path(__file__).resolve().parent
-    task_yaml_path = root / case_name / "task.yaml"
-    task_yaml = task_yaml_path.read_text()
-    task_toml_path = root / case_name / "task.toml"
-    task_toml = task_toml_path.read_text()
-    return joj1.Config(**yaml.safe_load(task_yaml)), rtoml.loads(task_toml)
+from joj3_config_generator.load import load_joj1_yaml
 
 
 def load_case(case_name: str) -> None:
-    joj1, expected_result = read_convert_joj1_files(case_name)
-    result = convert_joj1(joj1).model_dump(by_alias=True, exclude_none=True)
+    root = Path(__file__).resolve().parent
+    task_yaml_path = root / case_name / "task.yaml"
+    task_yaml = load_joj1_yaml(task_yaml_path)
+    task_toml_path = root / case_name / "task.toml"
+    task_toml = task_toml_path.read_text()
+    expected_result = rtoml.loads(task_toml)
+    result = convert_joj1(task_yaml).model_dump(
+        mode="json", by_alias=True, exclude_none=True
+    )
     assert result == expected_result