diff --git a/test_runner/regress/test_compaction.py b/test_runner/regress/test_compaction.py
index 53edf9f79e..0dfc665a1d 100644
--- a/test_runner/regress/test_compaction.py
+++ b/test_runner/regress/test_compaction.py
@@ -229,7 +229,7 @@ def test_pageserver_gc_compaction_preempt(
 
 
 @skip_in_debug_build("only run with release build")
-@pytest.mark.timeout(600)  # This test is slow with sanitizers enabled, especially on ARM
+@pytest.mark.timeout(900)  # This test is slow with sanitizers enabled, especially on ARM
 @pytest.mark.parametrize(
     "with_branches",
     ["with_branches", "no_branches"],
diff --git a/test_runner/regress/test_pg_regress.py b/test_runner/regress/test_pg_regress.py
index 0fea706888..474002353b 100644
--- a/test_runner/regress/test_pg_regress.py
+++ b/test_runner/regress/test_pg_regress.py
@@ -471,7 +471,7 @@ def test_tx_abort_with_many_relations(
         try:
             # Rollback phase should be fast: this is one WAL record that we should process efficiently
             fut = exec.submit(rollback_and_wait)
-            fut.result(timeout=15)
+            fut.result(timeout=15 if reldir_type == "v1" else 30)
         except:
             exec.shutdown(wait=False, cancel_futures=True)
             raise