diff --git a/src/crewai/knowledge/source/docling_source.py b/src/crewai/knowledge/source/docling_source.py
index cc751d2f8..7257cac7f 100644
--- a/src/crewai/knowledge/source/docling_source.py
+++ b/src/crewai/knowledge/source/docling_source.py
@@ -1,5 +1,5 @@
 from pathlib import Path
-from typing import Iterator, List, Union
+from typing import Iterator, List, Optional, Union
 from urllib.parse import urlparse
 
 from docling.datamodel.base_models import InputFormat
@@ -20,8 +20,8 @@ class DoclingSource(BaseKnowledgeSource):
 
     _logger: Logger = Logger(verbose=True)
 
-    file_path: List[str] = Field(default=None)
-    file_paths: List[str] = Field(default_factory=list)
+    file_path: Optional[List[Union[Path, str]]] = Field(default=None)
+    file_paths: List[Union[Path, str]] = Field(default_factory=list)
     document_converter: DocumentConverter = Field(default_factory=DocumentConverter)
     chunks: List[str] = Field(default_factory=list)
     safe_file_paths: List[Union[Path, str]] = Field(default_factory=list)
diff --git a/tests/knowledge/knowledge_test.py b/tests/knowledge/knowledge_test.py
index 7942b5e69..e13ebcaef 100644
--- a/tests/knowledge/knowledge_test.py
+++ b/tests/knowledge/knowledge_test.py
@@ -1,6 +1,7 @@
 """Test Knowledge creation and querying functionality."""
 
 from pathlib import Path
+from typing import List, Union
 from unittest.mock import patch
 
 import pytest
@@ -567,7 +568,7 @@ def test_docling_source(mock_vector_db):
 
 
 def test_multiple_docling_sources():
-    urls = [
+    urls: List[Union[Path, str]] = [
         "https://lilianweng.github.io/posts/2024-11-28-reward-hacking/",
         "https://lilianweng.github.io/posts/2024-07-07-hallucination/",
     ]
@@ -580,6 +581,6 @@ def test_multiple_docling_sources():
 def test_docling_source_with_local_file():
     current_dir = Path(__file__).parent
     pdf_path = current_dir / "crewai_quickstart.pdf"
-    docling_source = DoclingSource(file_paths=[str(pdf_path.name)])
-    assert docling_source.file_paths == [str(pdf_path.name)]
+    docling_source = DoclingSource(file_paths=[pdf_path])
+    assert docling_source.file_paths == [pdf_path]
     assert docling_source.content is not None