diff --git a/pyiceberg/catalog/rest.py b/pyiceberg/catalog/rest.py
index b4b9f722b5..8560668a0d 100644
--- a/pyiceberg/catalog/rest.py
+++ b/pyiceberg/catalog/rest.py
@@ -237,6 +237,7 @@ def _create_session(self) -> Session:
         session.headers["Content-type"] = "application/json"
         session.headers["X-Client-Version"] = ICEBERG_REST_SPEC_VERSION
         session.headers["User-Agent"] = f"PyIceberg/{__version__}"
+        session.headers["X-Iceberg-Access-Delegation"] = "vended-credentials"
 
         # Configure SigV4 Request Signing
         if str(self.properties.get(SIGV4, False)).lower() == "true":