diff --git a/tools/run_tests/python_utils/check_on_pr.py b/tools/run_tests/python_utils/check_on_pr.py
index fff455f7d5e..f2b0f24e4fe 100644
--- a/tools/run_tests/python_utils/check_on_pr.py
+++ b/tools/run_tests/python_utils/check_on_pr.py
@@ -29,8 +29,8 @@ _GITHUB_APP_ID = 22338
 _INSTALLATION_ID = 519109
 
 _ACCESS_TOKEN_CACHE = None
-_ACCESS_TOKEN_FETCH_RETRIES = 5
-_ACCESS_TOKEN_FETCH_RETRIES_INTERVAL_S = 1
+_ACCESS_TOKEN_FETCH_RETRIES = 6
+_ACCESS_TOKEN_FETCH_RETRIES_INTERVAL_S = 15
 
 
 def _jwt_token():