diff --git a/packages/google-cloud-monitoring/tests/unit/gapic/monitoring_v3/test_alert_policy_service.py b/packages/google-cloud-monitoring/tests/unit/gapic/monitoring_v3/test_alert_policy_service.py
index 9dff949c52b1..5eaa918519d8 100644
--- a/packages/google-cloud-monitoring/tests/unit/gapic/monitoring_v3/test_alert_policy_service.py
+++ b/packages/google-cloud-monitoring/tests/unit/gapic/monitoring_v3/test_alert_policy_service.py
@@ -14,7 +14,13 @@
 # limitations under the License.
 #
 import os
-import mock
+
+# try/except added for compatibility with python < 3.8
+try:
+    from unittest import mock
+    from unittest.mock import AsyncMock
+except ImportError:
+    import mock
 
 import grpc
 from grpc.experimental import aio
diff --git a/packages/google-cloud-monitoring/tests/unit/gapic/monitoring_v3/test_group_service.py b/packages/google-cloud-monitoring/tests/unit/gapic/monitoring_v3/test_group_service.py
index ff4612cb0db2..da09fe1907c0 100644
--- a/packages/google-cloud-monitoring/tests/unit/gapic/monitoring_v3/test_group_service.py
+++ b/packages/google-cloud-monitoring/tests/unit/gapic/monitoring_v3/test_group_service.py
@@ -14,7 +14,13 @@
 # limitations under the License.
 #
 import os
-import mock
+
+# try/except added for compatibility with python < 3.8
+try:
+    from unittest import mock
+    from unittest.mock import AsyncMock
+except ImportError:
+    import mock
 
 import grpc
 from grpc.experimental import aio
diff --git a/packages/google-cloud-monitoring/tests/unit/gapic/monitoring_v3/test_metric_service.py b/packages/google-cloud-monitoring/tests/unit/gapic/monitoring_v3/test_metric_service.py
index b24b8d19224b..7e3410056d72 100644
--- a/packages/google-cloud-monitoring/tests/unit/gapic/monitoring_v3/test_metric_service.py
+++ b/packages/google-cloud-monitoring/tests/unit/gapic/monitoring_v3/test_metric_service.py
@@ -14,7 +14,13 @@
 # limitations under the License.
 #
 import os
-import mock
+
+# try/except added for compatibility with python < 3.8
+try:
+    from unittest import mock
+    from unittest.mock import AsyncMock
+except ImportError:
+    import mock
 
 import grpc
 from grpc.experimental import aio
diff --git a/packages/google-cloud-monitoring/tests/unit/gapic/monitoring_v3/test_notification_channel_service.py b/packages/google-cloud-monitoring/tests/unit/gapic/monitoring_v3/test_notification_channel_service.py
index 274b8aa6aea8..c4949c2ae6cc 100644
--- a/packages/google-cloud-monitoring/tests/unit/gapic/monitoring_v3/test_notification_channel_service.py
+++ b/packages/google-cloud-monitoring/tests/unit/gapic/monitoring_v3/test_notification_channel_service.py
@@ -14,7 +14,13 @@
 # limitations under the License.
 #
 import os
-import mock
+
+# try/except added for compatibility with python < 3.8
+try:
+    from unittest import mock
+    from unittest.mock import AsyncMock
+except ImportError:
+    import mock
 
 import grpc
 from grpc.experimental import aio
diff --git a/packages/google-cloud-monitoring/tests/unit/gapic/monitoring_v3/test_query_service.py b/packages/google-cloud-monitoring/tests/unit/gapic/monitoring_v3/test_query_service.py
index 502b546cbd0c..8c6f6aa468b6 100644
--- a/packages/google-cloud-monitoring/tests/unit/gapic/monitoring_v3/test_query_service.py
+++ b/packages/google-cloud-monitoring/tests/unit/gapic/monitoring_v3/test_query_service.py
@@ -14,7 +14,13 @@
 # limitations under the License.
 #
 import os
-import mock
+
+# try/except added for compatibility with python < 3.8
+try:
+    from unittest import mock
+    from unittest.mock import AsyncMock
+except ImportError:
+    import mock
 
 import grpc
 from grpc.experimental import aio
diff --git a/packages/google-cloud-monitoring/tests/unit/gapic/monitoring_v3/test_service_monitoring_service.py b/packages/google-cloud-monitoring/tests/unit/gapic/monitoring_v3/test_service_monitoring_service.py
index fe1d69d87f20..8a42d7c434fe 100644
--- a/packages/google-cloud-monitoring/tests/unit/gapic/monitoring_v3/test_service_monitoring_service.py
+++ b/packages/google-cloud-monitoring/tests/unit/gapic/monitoring_v3/test_service_monitoring_service.py
@@ -14,7 +14,13 @@
 # limitations under the License.
 #
 import os
-import mock
+
+# try/except added for compatibility with python < 3.8
+try:
+    from unittest import mock
+    from unittest.mock import AsyncMock
+except ImportError:
+    import mock
 
 import grpc
 from grpc.experimental import aio
diff --git a/packages/google-cloud-monitoring/tests/unit/gapic/monitoring_v3/test_uptime_check_service.py b/packages/google-cloud-monitoring/tests/unit/gapic/monitoring_v3/test_uptime_check_service.py
index eeca7131d1e3..b2f26a71ead1 100644
--- a/packages/google-cloud-monitoring/tests/unit/gapic/monitoring_v3/test_uptime_check_service.py
+++ b/packages/google-cloud-monitoring/tests/unit/gapic/monitoring_v3/test_uptime_check_service.py
@@ -14,7 +14,13 @@
 # limitations under the License.
 #
 import os
-import mock
+
+# try/except added for compatibility with python < 3.8
+try:
+    from unittest import mock
+    from unittest.mock import AsyncMock
+except ImportError:
+    import mock
 
 import grpc
 from grpc.experimental import aio