diff --git a/tests/unit/data/_async/test_client.py b/tests/unit/data/_async/test_client.py
index 97f11ebde..6d2d23e44 100644
--- a/tests/unit/data/_async/test_client.py
+++ b/tests/unit/data/_async/test_client.py
@@ -1906,7 +1906,7 @@ async def mock_call(*args, **kwargs):
                     assert read_rows.call_count == 10
                     assert len(result) == 10
                     # if run in sequence, we would expect this to take 1 second
-                    assert call_time < 0.2
+                    assert call_time < 0.5
 
     @CrossSync.pytest
     async def test_read_rows_sharded_concurrency_limit(self):
diff --git a/tests/unit/data/_sync_autogen/test_client.py b/tests/unit/data/_sync_autogen/test_client.py
index e4445f595..87311d646 100644
--- a/tests/unit/data/_sync_autogen/test_client.py
+++ b/tests/unit/data/_sync_autogen/test_client.py
@@ -1587,7 +1587,7 @@ def mock_call(*args, **kwargs):
                     call_time = time.monotonic() - start_time
                     assert read_rows.call_count == 10
                     assert len(result) == 10
-                    assert call_time < 0.2
+                    assert call_time < 0.5
 
     def test_read_rows_sharded_concurrency_limit(self):
         """Only 10 queries should be processed concurrently. Others should be queued
diff --git a/tests/unit/data/test__helpers.py b/tests/unit/data/test__helpers.py
index 588890265..39db06689 100644
--- a/tests/unit/data/test__helpers.py
+++ b/tests/unit/data/test__helpers.py
@@ -81,7 +81,7 @@ def test_attempt_timeout_w_sleeps(self):
         sleep_time = 0.1
         for i in range(3):
             found_value = next(generator)
-            assert abs(found_value - expected_value) < 0.001
+            assert abs(found_value - expected_value) < 0.1
             sleep(sleep_time)
             expected_value -= sleep_time