diff --git a/google/cloud/pubsub_v1/subscriber/_protocol/streaming_pull_manager.py b/google/cloud/pubsub_v1/subscriber/_protocol/streaming_pull_manager.py
index ae3635892..894c41b4c 100644
--- a/google/cloud/pubsub_v1/subscriber/_protocol/streaming_pull_manager.py
+++ b/google/cloud/pubsub_v1/subscriber/_protocol/streaming_pull_manager.py
@@ -743,6 +743,9 @@ def heartbeat(self) -> bool:
                 request = gapic_types.StreamingPullRequest(
                     stream_ack_deadline_seconds=self.ack_deadline
                 )
+                _LOGGER.info(
+                    "Sending new ack_deadline of %d seconds.", self.ack_deadline
+                )
             else:
                 request = gapic_types.StreamingPullRequest()
 
diff --git a/tests/unit/pubsub_v1/subscriber/test_streaming_pull_manager.py b/tests/unit/pubsub_v1/subscriber/test_streaming_pull_manager.py
index 8a1460951..ad1647119 100644
--- a/tests/unit/pubsub_v1/subscriber/test_streaming_pull_manager.py
+++ b/tests/unit/pubsub_v1/subscriber/test_streaming_pull_manager.py
@@ -1035,7 +1035,8 @@ def test_heartbeat_inactive():
     assert not result
 
 
-def test_heartbeat_stream_ack_deadline_seconds():
+def test_heartbeat_stream_ack_deadline_seconds(caplog):
+    caplog.set_level(logging.INFO)
     manager = make_manager()
     manager._rpc = mock.create_autospec(bidi.BidiRpc, instance=True)
     manager._rpc.is_active = True
@@ -1050,6 +1051,7 @@ def test_heartbeat_stream_ack_deadline_seconds():
     assert result
     # Set to false after a send is initiated.
     assert not manager._send_new_ack_deadline
+    assert "Sending new ack_deadline of 10 seconds." in caplog.text
 
 
 @mock.patch("google.api_core.bidi.ResumableBidiRpc", autospec=True)