diff --git a/knowledge_base/samples/content/wiki b/knowledge_base/samples/content/wiki
index 9a3fa7a..4c6f1a9 160000
--- a/knowledge_base/samples/content/wiki
+++ b/knowledge_base/samples/content/wiki
@@ -1 +1 @@
-Subproject commit 9a3fa7a77f8748748b1c656fe8919ad5c4c63e3f
+Subproject commit 4c6f1a9748563b5d3ae81a628ff8a71f3e5686d1
diff --git a/server/knowledge_base/utils.py b/server/knowledge_base/utils.py
index 7a92529..fdfd2e3 100644
--- a/server/knowledge_base/utils.py
+++ b/server/knowledge_base/utils.py
@@ -95,7 +95,7 @@ LOADER_DICT = {"UnstructuredHTMLLoader": ['.html'],
                "RapidOCRLoader": ['.png', '.jpg', '.jpeg', '.bmp'],
                "UnstructuredEmailLoader": ['.eml', '.msg'],
                "UnstructuredEPubLoader": ['.epub'],
-               "UnstructuredExcelLoader": ['.xlsx', '.xlsd'],
+               "UnstructuredExcelLoader": ['.xlsx', '.xls', '.xlsd'],
                "NotebookLoader": ['.ipynb'],
                "UnstructuredODTLoader": ['.odt'],
                "PythonLoader": ['.py'],