diff --git a/awswrangler/s3/_read_deltalake.py b/awswrangler/s3/_read_deltalake.py
index efd0e2a38..19f9b6a9d 100644
--- a/awswrangler/s3/_read_deltalake.py
+++ b/awswrangler/s3/_read_deltalake.py
@@ -25,6 +25,7 @@ def _set_default_storage_options_kwargs(
 ) -> dict[str, Any]:
     defaults = {key.upper(): value for key, value in _utils.boto3_to_primitives(boto3_session=boto3_session).items()}
     defaults["AWS_REGION"] = defaults.pop("REGION_NAME")
+    defaults["AWS_SESSION_TOKEN"] = "" if defaults["AWS_SESSION_TOKEN"] is None else defaults["AWS_SESSION_TOKEN"]
     s3_additional_kwargs = s3_additional_kwargs or {}
     return {
         **defaults,
diff --git a/awswrangler/s3/_write_deltalake.py b/awswrangler/s3/_write_deltalake.py
index 2a4d05ed2..bc5e23e26 100644
--- a/awswrangler/s3/_write_deltalake.py
+++ b/awswrangler/s3/_write_deltalake.py
@@ -29,7 +29,7 @@ def _set_default_storage_options_kwargs(
 ) -> dict[str, Any]:
     defaults = {key.upper(): value for key, value in _utils.boto3_to_primitives(boto3_session=boto3_session).items()}
     defaults["AWS_REGION"] = defaults.pop("REGION_NAME")
-
+    defaults["AWS_SESSION_TOKEN"] = "" if defaults["AWS_SESSION_TOKEN"] is None else defaults["AWS_SESSION_TOKEN"]
     s3_additional_kwargs = s3_additional_kwargs or {}
 
     s3_lock_arguments = {}