diff --git a/.github/CODEOWNERS b/.github/CODEOWNERS
index 0546e1d814..f5c036fe95 100644
--- a/.github/CODEOWNERS
+++ b/.github/CODEOWNERS
@@ -4,4 +4,5 @@
 # For syntax help see:
 # https://help.github.com/en/github/creating-cloning-and-archiving-repositories/about-code-owners#codeowners-syntax
 
-* @googleapis/actools-python @googleapis/yoshi-python
+* @googleapis/actools-python @googleapis/yoshi-python @lukesneeringer
+*.yaml @googleapis/actools @googleapis/yoshi-python @googleapis/actools-python @lukesneeringer
diff --git a/.github/sync-repo-settings.yaml b/.github/sync-repo-settings.yaml
index 00d9c8e1f6..30ca3f5c8f 100644
--- a/.github/sync-repo-settings.yaml
+++ b/.github/sync-repo-settings.yaml
@@ -11,15 +11,25 @@ branchProtectionRules:
     - 'conventionalcommits.org'
     - 'docs'
     - 'mypy'
-    - 'showcase'
-    - 'showcase-mtls'
-    - 'showcase-unit'
-    - 'showcase-unit-alternative-templates'
-    - 'showcase-unit-add-iam-methods'
+    - 'showcase (showcase)'
+    - 'showcase (showcase_alternative_templates)'
+    - 'showcase-mtls (showcase_mtls)'
+    - 'showcase-mtls (showcase_mtls_alternative_templates)'
     - 'showcase-mypy'
-    - 'showcase-mypy-alternative-templates'
-    - 'unit'
+    - 'showcase-mypy (_alternative_templates)'
+    - 'showcase-unit (3.6)'
+    - 'showcase-unit (3.7)'
+    - 'showcase-unit (3.7, _alternative_templates)'
+    - 'showcase-unit (3.8)'
+    - 'showcase-unit (3.8, _alternative_templates)'
+    - 'showcase-unit (3.9)'
+    - 'showcase-unit (3.9, _alternative_templates)'
+    - 'showcase-unit-add-iam-methods'
     - 'style-check'
+    - 'unit (3.6)'
+    - 'unit (3.7)'
+    - 'unit (3.8)'
+    - 'unit (3.9)'
   requiredApprovingReviewCount: 1
   requiresCodeOwnerReviews: true
   requiresStrictStatusChecks: true
diff --git a/.github/workflows/tests.yaml b/.github/workflows/tests.yaml
index 5e9f063479..dae6d0bd54 100644
--- a/.github/workflows/tests.yaml
+++ b/.github/workflows/tests.yaml
@@ -13,6 +13,10 @@ jobs:
   docs:
     runs-on: ubuntu-latest
     steps:
+      - name: Cancel Previous Runs
+        uses: styfle/cancel-workflow-action@0.7.0
+        with:
+          access_token: ${{ github.token }}
       - uses: actions/checkout@v2
       - name: Set up Python 3.8
         uses: actions/setup-python@v2
@@ -25,6 +29,10 @@ jobs:
   mypy:
     runs-on: ubuntu-latest
     steps:
+      - name: Cancel Previous Runs
+        uses: styfle/cancel-workflow-action@0.7.0
+        with:
+          access_token: ${{ github.token }}
       - uses: actions/checkout@v2
       - name: Set up Python 3.8
         uses: actions/setup-python@v2
@@ -73,6 +81,10 @@ jobs:
         target: [showcase, showcase_alternative_templates]
     runs-on: ubuntu-latest
     steps:
+      - name: Cancel Previous Runs
+        uses: styfle/cancel-workflow-action@0.7.0
+        with:
+          access_token: ${{ github.token }}
       - uses: actions/checkout@v2
       - name: Set up Python 3.8
         uses: actions/setup-python@v2
@@ -109,6 +121,10 @@ jobs:
         target: [showcase_mtls, showcase_mtls_alternative_templates]
     runs-on: ubuntu-latest
     steps:
+      - name: Cancel Previous Runs
+        uses: styfle/cancel-workflow-action@0.7.0
+        with:
+          access_token: ${{ github.token }}
       - uses: actions/checkout@v2
       - name: Setup temp directory
         run: |
@@ -159,35 +175,16 @@ jobs:
     strategy:
       matrix:
         python: [3.6, 3.7, 3.8, 3.9]
+        variant: ['', _alternative_templates]
+        exclude:
+          - python: 3.6
+            variant: _alternative_templates
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v2
-      - name: Set up Python ${{ matrix.python }}
-        uses: actions/setup-python@v2
+      - name: Cancel Previous Runs
+        uses: styfle/cancel-workflow-action@0.7.0
         with:
-          python-version: ${{ matrix.python }}
-      - name: Install system dependencies.
-        run: |
-            sudo apt-get update
-            sudo apt-get install -y curl pandoc unzip gcc
-      - name: Install protoc 3.12.1.
-        run: |
-            sudo mkdir -p /usr/src/protoc/
-            sudo chown -R ${USER} /usr/src/
-            curl --location https://github.com/google/protobuf/releases/download/v3.12.1/protoc-3.12.1-linux-x86_64.zip --output /usr/src/protoc/protoc-3.12.1.zip
-            cd /usr/src/protoc/
-            unzip protoc-3.12.1.zip
-            sudo ln -s /usr/src/protoc/bin/protoc /usr/local/bin/protoc
-      - name: Install nox.
-        run: python -m pip install nox
-      - name: Run unit tests.
-        run: nox -s showcase_unit-${{ matrix.python }}
-  showcase-unit-alternative-templates:
-    strategy:
-      matrix:
-        python: [3.7, 3.8, 3.9]
-    runs-on: ubuntu-latest
-    steps:
+          access_token: ${{ github.token }}
       - uses: actions/checkout@v2
       - name: Set up Python ${{ matrix.python }}
         uses: actions/setup-python@v2
@@ -208,10 +205,14 @@ jobs:
       - name: Install nox.
         run: python -m pip install nox
       - name: Run unit tests.
-        run: nox -s showcase_unit_alternative_templates-${{ matrix.python }}
+        run: nox -s showcase_unit${{ matrix.variant }}-${{ matrix.python }}
   showcase-unit-add-iam-methods:
     runs-on: ubuntu-latest
     steps:
+      - name: Cancel Previous Runs
+        uses: styfle/cancel-workflow-action@0.7.0
+        with:
+          access_token: ${{ github.token }}
       - uses: actions/checkout@v2
       - name: Set up Python 3.8
         uses: actions/setup-python@v2
@@ -232,34 +233,17 @@ jobs:
       - name: Install nox.
         run: python -m pip install nox
       - name: Run unit tests.
-        run: nox -s showcase_unit_add_iam_methods-3.8
+        run: nox -s showcase_unit_add_iam_methods
   showcase-mypy:
     runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        variant: ['', _alternative_templates]
     steps:
-      - uses: actions/checkout@v2
-      - name: Set up Python 3.8
-        uses: actions/setup-python@v2
+      - name: Cancel Previous Runs
+        uses: styfle/cancel-workflow-action@0.7.0
         with:
-          python-version: 3.8
-      - name: Install system dependencies.
-        run: |
-            sudo apt-get update
-            sudo apt-get install -y curl pandoc unzip gcc
-      - name: Install protoc 3.12.1.
-        run: |
-            sudo mkdir -p /usr/src/protoc/
-            sudo chown -R ${USER} /usr/src/
-            curl --location https://github.com/google/protobuf/releases/download/v3.12.1/protoc-3.12.1-linux-x86_64.zip --output /usr/src/protoc/protoc-3.12.1.zip
-            cd /usr/src/protoc/
-            unzip protoc-3.12.1.zip
-            sudo ln -s /usr/src/protoc/bin/protoc /usr/local/bin/protoc
-      - name: Install nox.
-        run: python -m pip install nox
-      - name: Typecheck the generated output.
-        run: nox -s showcase_mypy
-  showcase-mypy-alternative-templates:
-    runs-on: ubuntu-latest
-    steps:
+          access_token: ${{ github.token }}
       - uses: actions/checkout@v2
       - name: Set up Python 3.8
         uses: actions/setup-python@v2
@@ -280,13 +264,17 @@ jobs:
       - name: Install nox.
         run: python -m pip install nox
       - name: Typecheck the generated output.
-        run: nox -s showcase_mypy_alternative_templates
+        run: nox -s showcase_mypy${{ matrix.variant }}
   unit:
     strategy:
       matrix:
         python: [3.6, 3.7, 3.8, 3.9]
     runs-on: ubuntu-latest
     steps:
+      - name: Cancel Previous Runs
+        uses: styfle/cancel-workflow-action@0.7.0
+        with:
+          access_token: ${{ github.token }}
       - uses: actions/checkout@v2
       - name: Set up Python ${{ matrix.python }}
         uses: actions/setup-python@v2
@@ -308,6 +296,10 @@ jobs:
   style-check:
     runs-on: ubuntu-latest
     steps:
+      - name: Cancel Previous Runs
+        uses: styfle/cancel-workflow-action@0.7.0
+        with:
+          access_token: ${{ github.token }}
       - uses: actions/checkout@v2
       - name: Set up Python 3.8
         uses: actions/setup-python@v2
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 5c92f6855e..79dcfdedde 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,12 @@
 # Changelog
 
+### [0.40.10](https://www.github.com/googleapis/gapic-generator-python/compare/v0.40.9...v0.40.10) (2021-02-17)
+
+
+### Bug Fixes
+
+* ignore unknown fields returned from server for REST ([#777](https://www.github.com/googleapis/gapic-generator-python/issues/777)) ([a70b078](https://www.github.com/googleapis/gapic-generator-python/commit/a70b0787f7e3d40642a4f68574f0cc493cc4e054))
+
 ### [0.40.9](https://www.github.com/googleapis/gapic-generator-python/compare/v0.40.8...v0.40.9) (2021-02-10)
 
 
diff --git a/gapic/templates/%namespace/%name_%version/%sub/services/%service/async_client.py.j2 b/gapic/templates/%namespace/%name_%version/%sub/services/%service/async_client.py.j2
index f6e380d067..c0e2c9a6ac 100644
--- a/gapic/templates/%namespace/%name_%version/%sub/services/%service/async_client.py.j2
+++ b/gapic/templates/%namespace/%name_%version/%sub/services/%service/async_client.py.j2
@@ -48,8 +48,36 @@ class {{ service.async_client_name }}:
     parse_common_{{ resource_msg.message_type.resource_type|snake_case }}_path = staticmethod({{ service.client_name }}.parse_common_{{ resource_msg.message_type.resource_type|snake_case }}_path)
     {% endfor %}
 
-    from_service_account_info = {{ service.client_name }}.from_service_account_info
-    from_service_account_file = {{ service.client_name }}.from_service_account_file
+    @classmethod
+    def from_service_account_info(cls, info: dict, *args, **kwargs):
+        """Creates an instance of this client using the provided credentials info.
+
+        Args:
+            info (dict): The service account private key info.
+            args: Additional arguments to pass to the constructor.
+            kwargs: Additional arguments to pass to the constructor.
+
+        Returns:
+            {{ service.async_client_name }}: The constructed client.
+        """
+        return {{ service.client_name }}.from_service_account_info.__func__({{ service.async_client_name }}, info, *args, **kwargs)  # type: ignore
+
+    @classmethod
+    def from_service_account_file(cls, filename: str, *args, **kwargs):
+        """Creates an instance of this client using the provided credentials
+        file.
+
+        Args:
+            filename (str): The path to the service account private key json
+                file.
+            args: Additional arguments to pass to the constructor.
+            kwargs: Additional arguments to pass to the constructor.
+
+        Returns:
+            {{ service.async_client_name }}: The constructed client.
+        """
+        return {{ service.client_name }}.from_service_account_file.__func__({{ service.async_client_name }}, filename, *args, **kwargs)  # type: ignore
+
     from_service_account_json = from_service_account_file
 
     @property
diff --git a/gapic/templates/%namespace/%name_%version/%sub/services/%service/transports/rest.py.j2 b/gapic/templates/%namespace/%name_%version/%sub/services/%service/transports/rest.py.j2
index 1341571e48..bb6acbadd6 100644
--- a/gapic/templates/%namespace/%name_%version/%sub/services/%service/transports/rest.py.j2
+++ b/gapic/templates/%namespace/%name_%version/%sub/services/%service/transports/rest.py.j2
@@ -207,7 +207,10 @@ class {{ service.name }}RestTransport({{ service.name }}Transport):
         {%- if not method.void %}
 
         # Return the response
-        return {{ method.output.ident }}.from_json(response.content)
+        return {{ method.output.ident }}.from_json(
+            response.content,
+            ignore_unknown_fields=True
+        )
         {%- endif %}
     {%- endif %}
     {%- endfor %}
diff --git a/gapic/templates/tests/unit/gapic/%name_%version/%sub/test_%service.py.j2 b/gapic/templates/tests/unit/gapic/%name_%version/%sub/test_%service.py.j2
index e03331c680..14a7f03f75 100644
--- a/gapic/templates/tests/unit/gapic/%name_%version/%sub/test_%service.py.j2
+++ b/gapic/templates/tests/unit/gapic/%name_%version/%sub/test_%service.py.j2
@@ -77,13 +77,20 @@ def test__get_default_mtls_endpoint():
     assert {{ service.client_name }}._get_default_mtls_endpoint(non_googleapi) == non_googleapi
 
 
-def test_{{ service.client_name|snake_case }}_from_service_account_info():
+@pytest.mark.parametrize("client_class", [
+    {{ service.client_name }},
+    {%- if 'grpc' in opts.transport %}
+    {{ service.async_client_name }},
+    {%- endif %}
+])
+def test_{{ service.client_name|snake_case }}_from_service_account_info(client_class):
     creds = credentials.AnonymousCredentials()
     with mock.patch.object(service_account.Credentials, 'from_service_account_info') as factory:
         factory.return_value = creds
         info = {"valid": True}
-        client = {{ service.client_name }}.from_service_account_info(info)
+        client = client_class.from_service_account_info(info)
         assert client.transport._credentials == creds
+        assert isinstance(client, client_class)
 
         {% if service.host %}assert client.transport._host == '{{ service.host }}{% if ":" not in service.host %}:443{% endif %}'{% endif %}
 
@@ -100,9 +107,11 @@ def test_{{ service.client_name|snake_case }}_from_service_account_file(client_c
         factory.return_value = creds
         client = client_class.from_service_account_file("dummy/file/path.json")
         assert client.transport._credentials == creds
+        assert isinstance(client, client_class)
 
         client = client_class.from_service_account_json("dummy/file/path.json")
         assert client.transport._credentials == creds
+        assert isinstance(client, client_class)
 
         {% if service.host %}assert client.transport._host == '{{ service.host }}{% if ":" not in service.host %}:443{% endif %}'{% endif %}