diff --git a/test_runner/batch_others/test_wal_acceptor.py b/test_runner/batch_others/test_wal_acceptor.py
index 0177555787..99849762f2 100644
--- a/test_runner/batch_others/test_wal_acceptor.py
+++ b/test_runner/batch_others/test_wal_acceptor.py
@@ -505,6 +505,9 @@ def test_sync_safekeepers_old_term_ahead(repo_dir: str, pg_bin: PgBin, wa_factor
     appender.append(2, term=1, lm_message="msg1")
     appender.append(2, term=1, lm_message="msg1")
 
+    new_epoch = appender.flush_lsns[0]
+    appender.epoch_start_lsn = new_epoch
+
     appender.append(0, term=2, lm_message="msg2")
     appender.append(1, term=2, lm_message="msg2")
 
diff --git a/vendor/postgres b/vendor/postgres
index 56c561aa77..a97cfe8ed7 160000
--- a/vendor/postgres
+++ b/vendor/postgres
@@ -1 +1 @@
-Subproject commit 56c561aa770b01d9e5cfcbf064eebe33349b7f77
+Subproject commit a97cfe8ed781857b2880bf1e0b4ff04972b9c8dc