diff --git a/google/cloud/firestore_v1/base_client.py b/google/cloud/firestore_v1/base_client.py
index b3691cffc..06ec6b8e2 100644
--- a/google/cloud/firestore_v1/base_client.py
+++ b/google/cloud/firestore_v1/base_client.py
@@ -109,7 +109,10 @@ def __init__(
         #       will have no impact since the _http() @property only lazily
         #       creates a working HTTP object.
         super(BaseClient, self).__init__(
-            project=project, credentials=credentials, _http=None
+            project=project,
+            credentials=credentials,
+            client_options=client_options,
+            _http=None,
         )
         self._client_info = client_info
         if client_options:
diff --git a/setup.py b/setup.py
index a565fb27a..a9bfd86af 100644
--- a/setup.py
+++ b/setup.py
@@ -26,7 +26,7 @@
 release_status = "Development Status :: 5 - Production/Stable"
 dependencies = [
     "google-api-core[grpc] >= 1.21.0, < 2.0.0dev",
-    "google-cloud-core >= 1.0.3, < 2.0dev",
+    "google-cloud-core >= 1.4.1, < 2.0dev",
     "pytz",
     "libcst >= 0.2.5",
     "proto-plus >= 1.3.0",
diff --git a/tests/unit/v1/test_async_client.py b/tests/unit/v1/test_async_client.py
index 8a6527175..770d6ae20 100644
--- a/tests/unit/v1/test_async_client.py
+++ b/tests/unit/v1/test_async_client.py
@@ -63,10 +63,12 @@ def test_constructor_with_emulator_host(self):
             getenv.assert_called_once_with(_FIRESTORE_EMULATOR_HOST)
 
     def test_constructor_explicit(self):
+        from google.api_core.client_options import ClientOptions
+
         credentials = _make_credentials()
         database = "now-db"
         client_info = mock.Mock()
-        client_options = mock.Mock()
+        client_options = ClientOptions("endpoint")
         client = self._make_one(
             project=self.PROJECT,
             credentials=credentials,
diff --git a/tests/unit/v1/test_client.py b/tests/unit/v1/test_client.py
index 433fcadfa..b943fd1e1 100644
--- a/tests/unit/v1/test_client.py
+++ b/tests/unit/v1/test_client.py
@@ -61,10 +61,12 @@ def test_constructor_with_emulator_host(self):
             getenv.assert_called_once_with(_FIRESTORE_EMULATOR_HOST)
 
     def test_constructor_explicit(self):
+        from google.api_core.client_options import ClientOptions
+
         credentials = _make_credentials()
         database = "now-db"
         client_info = mock.Mock()
-        client_options = mock.Mock()
+        client_options = ClientOptions("endpoint")
         client = self._make_one(
             project=self.PROJECT,
             credentials=credentials,