diff --git a/api/configs/app_config.py b/api/configs/app_config.py
index 62f2f1061f..690178a4dc 100644
--- a/api/configs/app_config.py
+++ b/api/configs/app_config.py
@@ -106,7 +106,7 @@ class DifyConfig(
             TomlConfigSettingsSource(
                 settings_cls=settings_cls,
                 toml_file=search_file_upwards(
-                    base_dir_path=os.path.dirname(Path(__file__)),
+                    base_dir_path=Path(__file__).parent,
                     target_file_name="pyproject.toml",
                     max_search_parent_depth=2,
                 ),
diff --git a/api/libs/file_utils.py b/api/libs/file_utils.py
index fecdf637df..e2b4f3f1f4 100644
--- a/api/libs/file_utils.py
+++ b/api/libs/file_utils.py
@@ -1,12 +1,13 @@
 import os
+from pathlib import Path
 from typing import Optional
 
 
 def search_file_upwards(
-    base_dir_path: str,
+    base_dir_path: Path,
     target_file_name: str,
-    max_search_parent_depth: int = 1,
-) -> Optional[str]:
+    max_search_parent_depth: int,
+) -> Path:
     """
     Find a target file in the current directory or its parent directories up to a specified depth.
     :param base_dir_path: Starting directory path to search from.
@@ -14,17 +15,18 @@ def search_file_upwards(
     :param max_search_parent_depth: Maximum number of parent directories to search upwards.
     :return: Path of the file if found, otherwise None.
     """
-    current_dir = base_dir_path
-    for level in range(max_search_parent_depth):
-        candidate = os.path.join(current_dir, target_file_name)
-        if os.path.isfile(candidate):
-            return candidate
-        parent_dir = os.path.dirname(current_dir)
-        if parent_dir == current_dir:
+    current_path = base_dir_path.resolve()
+    for _ in range(max_search_parent_depth):
+        candidate_path = current_path / target_file_name
+        if candidate_path.is_file():
+            return candidate_path
+        parent_path = current_path.parent
+        if parent_path == current_path:  # reached the root directory
             break
-        current_dir = parent_dir
+        else:
+            current_path = parent_path
 
     raise ValueError(
-        f"File '{target_file_name}' not found in the directory '{base_dir_path}' or its parent directories"
+        f"File '{target_file_name}' not found in the directory '{base_dir_path.resolve()}' or its parent directories"
         f" in depth of {max_search_parent_depth}."
     )