diff --git a/embedchain/loaders/pdf_file.py b/embedchain/loaders/pdf_file.py
index fb97f324..77107764 100644
--- a/embedchain/loaders/pdf_file.py
+++ b/embedchain/loaders/pdf_file.py
@@ -15,7 +15,10 @@ from embedchain.utils.misc import clean_string
 class PdfFileLoader(BaseLoader):
     def load_data(self, url):
         """Load data from a PDF file."""
-        loader = PyPDFLoader(url)
+        headers = {
+            "User-Agent": "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/98.0.4758.102 Safari/537.36",  # noqa:E501
+        }
+        loader = PyPDFLoader(url, headers=headers)
         data = []
         all_content = []
         pages = loader.load_and_split()
diff --git a/embedchain/loaders/sitemap.py b/embedchain/loaders/sitemap.py
index fc6e7b4e..4e4da7e1 100644
--- a/embedchain/loaders/sitemap.py
+++ b/embedchain/loaders/sitemap.py
@@ -31,10 +31,13 @@ class SitemapLoader(BaseLoader):
     def load_data(self, sitemap_source):
         output = []
         web_page_loader = WebPageLoader()
+        headers = {
+            "User-Agent": "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/98.0.4758.102 Safari/537.36",  # noqa:E501
+        }
 
         if urlparse(sitemap_source).scheme in ("http", "https"):
             try:
-                response = requests.get(sitemap_source)
+                response = requests.get(sitemap_source, headers=headers)
                 response.raise_for_status()
                 soup = BeautifulSoup(response.text, "xml")
             except requests.RequestException as e: