diff --git a/CHANGELOG.md b/CHANGELOG.md
index 540279f5..bd48bd8b 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -25,6 +25,11 @@ and uses [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 -
 
 -->
+------
+## [v6.6.3](https://github.com/asfadmin/Discovery-asf_search/compare/v6.6.2...v6.6.3)
+### Fixed
+- Fixes type hinting compatibility break introduced in v6.6.2 in `search_generator.py` for Python versions < v3.9
+
 ------
 ## [v6.6.2](https://github.com/asfadmin/Discovery-asf_search/compare/v6.6.1...v6.6.2)
 ### Added
diff --git a/asf_search/search/search_generator.py b/asf_search/search/search_generator.py
index 156e50d5..8763ea7e 100644
--- a/asf_search/search/search_generator.py
+++ b/asf_search/search/search_generator.py
@@ -1,5 +1,5 @@
 import logging
-from typing import Generator, Union, Iterable, Tuple
+from typing import Generator, Union, Iterable, Tuple, List
 from copy import copy
 from requests.exceptions import HTTPError
 from requests import ReadTimeout, Response
@@ -20,7 +20,6 @@
 from asf_search.WKT.validate_wkt import validate_wkt
 from asf_search.search.error_reporting import report_search_error
 
-
 def search_generator(        
         absoluteOrbit: Union[int, Tuple[int, int], Iterable[Union[int, Tuple[int, int]]]] = None,
         asfFrame: Union[int, Tuple[int, int], Iterable[Union[int, Tuple[int, int]]]] = None,
@@ -131,7 +130,7 @@ def query_cmr(session: ASFSession, url: str, translated_opts: dict, sub_query_co
     return items, hits, response.headers.get('CMR-Search-After', None)
     
 
-def process_page(items: list[ASFProduct], max_results: int, subquery_max_results: int, total: int, subquery_count: int, opts: ASFSearchOptions):
+def process_page(items: List[ASFProduct], max_results: int, subquery_max_results: int, total: int, subquery_count: int, opts: ASFSearchOptions):
     if max_results is None:
         last_page = ASFSearchResults(items[:min(subquery_max_results - subquery_count, len(items))], opts=opts)
     else: