diff --git a/packages/google-cloud-private-ca/tests/unit/gapic/privateca_v1/test_certificate_authority_service.py b/packages/google-cloud-private-ca/tests/unit/gapic/privateca_v1/test_certificate_authority_service.py
index 821fd87a7df1..a07d69f3881d 100644
--- a/packages/google-cloud-private-ca/tests/unit/gapic/privateca_v1/test_certificate_authority_service.py
+++ b/packages/google-cloud-private-ca/tests/unit/gapic/privateca_v1/test_certificate_authority_service.py
@@ -13,9 +13,17 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 #
-import math
 import os
 
+# try/except added for compatibility with python < 3.8
+try:
+    from unittest import mock
+    from unittest.mock import AsyncMock
+except ImportError:
+    import mock
+
+import math
+
 from google.api_core import (
     future,
     gapic_v1,
@@ -39,7 +47,6 @@
 from google.type import expr_pb2  # type: ignore
 import grpc
 from grpc.experimental import aio
-import mock
 from proto.marshal.rules.dates import DurationRule, TimestampRule
 import pytest
 
diff --git a/packages/google-cloud-private-ca/tests/unit/gapic/privateca_v1beta1/test_certificate_authority_service.py b/packages/google-cloud-private-ca/tests/unit/gapic/privateca_v1beta1/test_certificate_authority_service.py
index c7a7a6def33f..0bd531d94e77 100644
--- a/packages/google-cloud-private-ca/tests/unit/gapic/privateca_v1beta1/test_certificate_authority_service.py
+++ b/packages/google-cloud-private-ca/tests/unit/gapic/privateca_v1beta1/test_certificate_authority_service.py
@@ -13,9 +13,17 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 #
-import math
 import os
 
+# try/except added for compatibility with python < 3.8
+try:
+    from unittest import mock
+    from unittest.mock import AsyncMock
+except ImportError:
+    import mock
+
+import math
+
 from google.api_core import (
     future,
     gapic_v1,
@@ -39,7 +47,6 @@
 from google.protobuf import wrappers_pb2  # type: ignore
 import grpc
 from grpc.experimental import aio
-import mock
 from proto.marshal.rules.dates import DurationRule, TimestampRule
 import pytest