diff --git a/.github/.OwlBot.lock.yaml b/.github/.OwlBot.lock.yaml
index bc893c97..64f82d6b 100644
--- a/.github/.OwlBot.lock.yaml
+++ b/.github/.OwlBot.lock.yaml
@@ -13,5 +13,5 @@
 # limitations under the License.
 docker:
   image: gcr.io/cloud-devrel-public-resources/owlbot-python:latest
-  digest: sha256:8a5d3f6a2e43ed8293f34e06a2f56931d1e88a2694c3bb11b15df4eb256ad163
-# created: 2022-04-06T10:30:21.687684602Z
+  digest: sha256:bc5eed3804aec2f05fad42aacf973821d9500c174015341f721a984a0825b6fd
+# created: 2022-04-21T15:43:16.246106921Z
diff --git a/.github/workflows/unittest.yml b/.github/workflows/unittest.yml
index 1a857a3d..77bfc2cc 100644
--- a/.github/workflows/unittest.yml
+++ b/.github/workflows/unittest.yml
@@ -42,7 +42,7 @@ jobs:
       run: |
         nox -s unit${{ matrix.option }}-${{ matrix.python }}
     - name: Upload coverage results
-      uses: actions/upload-artifact@v2
+      uses: actions/upload-artifact@v3
       with:
         name: coverage-artifacts
         path: .coverage${{ matrix.option }}-${{ matrix.python }}
@@ -64,7 +64,7 @@ jobs:
         python -m pip install --upgrade setuptools pip wheel
         python -m pip install coverage
     - name: Download coverage results
-      uses: actions/download-artifact@v2
+      uses: actions/download-artifact@v3
       with:
         name: coverage-artifacts
         path: .coverage-results/
diff --git a/.kokoro/docker/docs/Dockerfile b/.kokoro/docker/docs/Dockerfile
index 4e1b1fb8..238b87b9 100644
--- a/.kokoro/docker/docs/Dockerfile
+++ b/.kokoro/docker/docs/Dockerfile
@@ -12,7 +12,7 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-from ubuntu:20.04
+from ubuntu:22.04
 
 ENV DEBIAN_FRONTEND noninteractive
 
@@ -60,8 +60,24 @@ RUN apt-get update \
   && rm -rf /var/lib/apt/lists/* \
   && rm -f /var/cache/apt/archives/*.deb
 
+###################### Install python 3.8.11
+
+# Download python 3.8.11
+RUN wget https://www.python.org/ftp/python/3.8.11/Python-3.8.11.tgz
+
+# Extract files
+RUN tar -xvf Python-3.8.11.tgz
+
+# Install python 3.8.11
+RUN ./Python-3.8.11/configure --enable-optimizations
+RUN make altinstall
+
+###################### Install pip
 RUN wget -O /tmp/get-pip.py 'https://bootstrap.pypa.io/get-pip.py' \
-  && python3.8 /tmp/get-pip.py \
+  && python3 /tmp/get-pip.py \
   && rm /tmp/get-pip.py
 
+# Test pip
+RUN python3 -m pip
+
 CMD ["python3.8"]
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 5ac245f8..bfebfa51 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,6 +4,13 @@
 
 [1]: https://pypi.org/project/google-api-core/#history
 
+### [2.7.3](https://github.com/googleapis/python-api-core/compare/v2.7.2...v2.7.3) (2022-04-29)
+
+
+### Bug Fixes
+
+* Avoid AttributeError if grpcio-status is not installed ([#370](https://github.com/googleapis/python-api-core/issues/370)) ([022add1](https://github.com/googleapis/python-api-core/commit/022add16266f9c07f0f88eea13472cc2e0bfc991))
+
 ### [2.7.2](https://github.com/googleapis/python-api-core/compare/v2.7.1...v2.7.2) (2022-04-13)
 
 
diff --git a/google/api_core/exceptions.py b/google/api_core/exceptions.py
index bd2f8562..aaba8791 100644
--- a/google/api_core/exceptions.py
+++ b/google/api_core/exceptions.py
@@ -599,7 +599,9 @@ def from_grpc_error(rpc_exc):
     """
     # NOTE(lidiz) All gRPC error shares the parent class grpc.RpcError.
     # However, check for grpc.RpcError breaks backward compatibility.
-    if isinstance(rpc_exc, grpc.Call) or _is_informative_grpc_error(rpc_exc):
+    if (
+        grpc is not None and isinstance(rpc_exc, grpc.Call)
+    ) or _is_informative_grpc_error(rpc_exc):
         details, err_info = _parse_grpc_error_details(rpc_exc)
         return from_grpc_status(
             rpc_exc.code(),
diff --git a/google/api_core/version.py b/google/api_core/version.py
index 52126b8e..138e01b3 100644
--- a/google/api_core/version.py
+++ b/google/api_core/version.py
@@ -12,4 +12,4 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-__version__ = "2.7.2"
+__version__ = "2.7.3"
diff --git a/tests/unit/test_extended_operation.py b/tests/unit/test_extended_operation.py
index ad62b778..c551bfa8 100644
--- a/tests/unit/test_extended_operation.py
+++ b/tests/unit/test_extended_operation.py
@@ -70,8 +70,8 @@ def make_extended_operation(responses=None):
 def test_constructor():
     ex_op, refresh, _ = make_extended_operation()
     assert ex_op._extended_operation == refresh.responses[0]
-    assert ex_op.cancelled() is False
-    assert ex_op.done() is False
+    assert not ex_op.cancelled()
+    assert not ex_op.done()
     assert ex_op.name == TEST_OPERATION_NAME
     assert ex_op.status == CustomOperation.StatusCode.PENDING
     assert ex_op.error_code is None
diff --git a/tests/unit/test_rest_streaming.py b/tests/unit/test_rest_streaming.py
index 1b34a04f..a44c83c0 100644
--- a/tests/unit/test_rest_streaming.py
+++ b/tests/unit/test_rest_streaming.py
@@ -28,6 +28,7 @@
 from google.protobuf import timestamp_pb2
 
 
+__protobuf__ = proto.module(package=__name__)
 SEED = int(time.time())
 logging.info(f"Starting rest streaming tests with random seed: {SEED}")
 random.seed(SEED)