diff --git a/.gitignore b/.gitignore
index 88a8b8bc4..598752fa6 100644
--- a/.gitignore
+++ b/.gitignore
@@ -31,8 +31,11 @@ tests/data/user-key.json
 
 # PyCharm configuration:
 .idea
+venv/
 
 # Generated files
 pylintrc
 pylintrc.test
 pytype_output/
+
+.python-version
diff --git a/.kokoro/trampoline.sh b/.kokoro/trampoline.sh
index e8c4251f3..4b4ba9f81 100755
--- a/.kokoro/trampoline.sh
+++ b/.kokoro/trampoline.sh
@@ -1,5 +1,5 @@
 #!/bin/bash
-# Copyright 2017 Google Inc.
+# Copyright 2017 Google LLC
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 1613f0687..cc9919ead 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,6 +4,14 @@
 
 [1]: https://pypi.org/project/google-auth/#history
 
+### [1.11.1](https://www.github.com/googleapis/google-auth-library-python/compare/v1.11.0...v1.11.1) (2020-02-13)
+
+
+### Bug Fixes
+
+* compute engine id token credentials "with_target_audience" method ([#438](https://www.github.com/googleapis/google-auth-library-python/issues/438)) ([bc0ec93](https://www.github.com/googleapis/google-auth-library-python/commit/bc0ec93dc66fdcaa6a82222386623fa44f24ddfe))
+* update `_GOOGLE_OAUTH2_CERTS_URL` ([#365](https://www.github.com/googleapis/google-auth-library-python/issues/365)) ([054db75](https://www.github.com/googleapis/google-auth-library-python/commit/054db75734756b0e82e7984ca07fa80025edc908))
+
 ## [1.11.0](https://www.github.com/googleapis/google-auth-library-python/compare/v1.10.2...v1.11.0) (2020-01-23)
 
 
diff --git a/google/__init__.py b/google/__init__.py
index f36d79156..0d0a4c3ab 100644
--- a/google/__init__.py
+++ b/google/__init__.py
@@ -1,4 +1,4 @@
-# Copyright 2016 Google Inc.
+# Copyright 2016 Google LLC
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
diff --git a/google/auth/__init__.py b/google/auth/__init__.py
index 5f78cd17e..6b4b78b29 100644
--- a/google/auth/__init__.py
+++ b/google/auth/__init__.py
@@ -1,4 +1,4 @@
-# Copyright 2016 Google Inc.
+# Copyright 2016 Google LLC
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
diff --git a/google/auth/_oauth2client.py b/google/auth/_oauth2client.py
index b14a38254..95a9876f3 100644
--- a/google/auth/_oauth2client.py
+++ b/google/auth/_oauth2client.py
@@ -1,4 +1,4 @@
-# Copyright 2016 Google Inc.
+# Copyright 2016 Google LLC
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
diff --git a/google/auth/_service_account_info.py b/google/auth/_service_account_info.py
index 790be92e1..3d340c78d 100644
--- a/google/auth/_service_account_info.py
+++ b/google/auth/_service_account_info.py
@@ -1,4 +1,4 @@
-# Copyright 2016 Google Inc.
+# Copyright 2016 Google LLC
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
diff --git a/google/auth/app_engine.py b/google/auth/app_engine.py
index aec86a620..ab6995103 100644
--- a/google/auth/app_engine.py
+++ b/google/auth/app_engine.py
@@ -1,4 +1,4 @@
-# Copyright 2016 Google Inc.
+# Copyright 2016 Google LLC
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
diff --git a/google/auth/compute_engine/__init__.py b/google/auth/compute_engine/__init__.py
index 461f104dd..5c84234e9 100644
--- a/google/auth/compute_engine/__init__.py
+++ b/google/auth/compute_engine/__init__.py
@@ -1,4 +1,4 @@
-# Copyright 2016 Google Inc.
+# Copyright 2016 Google LLC
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
diff --git a/google/auth/compute_engine/_metadata.py b/google/auth/compute_engine/_metadata.py
index 30cd3d43b..2861192d0 100644
--- a/google/auth/compute_engine/_metadata.py
+++ b/google/auth/compute_engine/_metadata.py
@@ -1,4 +1,4 @@
-# Copyright 2016 Google Inc.
+# Copyright 2016 Google LLC
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
diff --git a/google/auth/compute_engine/credentials.py b/google/auth/compute_engine/credentials.py
index 0abfc0530..e35907abc 100644
--- a/google/auth/compute_engine/credentials.py
+++ b/google/auth/compute_engine/credentials.py
@@ -1,4 +1,4 @@
-# Copyright 2016 Google Inc.
+# Copyright 2016 Google LLC
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
@@ -136,6 +136,7 @@ def __init__(
         token_uri=_DEFAULT_TOKEN_URI,
         additional_claims=None,
         service_account_email=None,
+        signer=None,
     ):
         """
         Args:
@@ -150,6 +151,9 @@ def __init__(
             service_account_email (str): Optional explicit service account to
                 use to sign JWT tokens.
                 By default, this is the default GCE service account.
+            signer (google.auth.crypt.Signer): The signer used to sign JWTs.
+                In case the signer is specified, the request argument will be
+                ignored.
         """
         super(IDTokenCredentials, self).__init__()
 
@@ -158,11 +162,13 @@ def __init__(
             service_account_email = sa_info["email"]
         self._service_account_email = service_account_email
 
-        self._signer = iam.Signer(
-            request=request,
-            credentials=Credentials(),
-            service_account_email=service_account_email,
-        )
+        if signer is None:
+            signer = iam.Signer(
+                request=request,
+                credentials=Credentials(),
+                service_account_email=service_account_email,
+            )
+        self._signer = signer
 
         self._token_uri = token_uri
         self._target_audience = target_audience
@@ -182,12 +188,15 @@ def with_target_audience(self, target_audience):
             google.auth.service_account.IDTokenCredentials: A new credentials
                 instance.
         """
+        # since the signer is already instantiated,
+        # the request is not needed
         return self.__class__(
-            self._signer,
+            None,
             service_account_email=self._service_account_email,
             token_uri=self._token_uri,
             target_audience=target_audience,
             additional_claims=self._additional_claims.copy(),
+            signer=self.signer,
         )
 
     def _make_authorization_grant_assertion(self):
diff --git a/google/auth/credentials.py b/google/auth/credentials.py
index 81bbd0316..3cc976b52 100644
--- a/google/auth/credentials.py
+++ b/google/auth/credentials.py
@@ -1,4 +1,4 @@
-# Copyright 2016 Google Inc.
+# Copyright 2016 Google LLC
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
diff --git a/google/auth/crypt/__init__.py b/google/auth/crypt/__init__.py
index bf66e7100..39929fa0a 100644
--- a/google/auth/crypt/__init__.py
+++ b/google/auth/crypt/__init__.py
@@ -1,4 +1,4 @@
-# Copyright 2016 Google Inc.
+# Copyright 2016 Google LLC
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
diff --git a/google/auth/crypt/_cryptography_rsa.py b/google/auth/crypt/_cryptography_rsa.py
index 285cf5ccf..e94bc681e 100644
--- a/google/auth/crypt/_cryptography_rsa.py
+++ b/google/auth/crypt/_cryptography_rsa.py
@@ -1,4 +1,4 @@
-# Copyright 2017 Google Inc.
+# Copyright 2017 Google LLC
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
diff --git a/google/auth/crypt/_python_rsa.py b/google/auth/crypt/_python_rsa.py
index d53991c38..e288c5016 100644
--- a/google/auth/crypt/_python_rsa.py
+++ b/google/auth/crypt/_python_rsa.py
@@ -1,4 +1,4 @@
-# Copyright 2016 Google Inc.
+# Copyright 2016 Google LLC
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
diff --git a/google/auth/crypt/base.py b/google/auth/crypt/base.py
index ceb6e9c06..c98d5bf64 100644
--- a/google/auth/crypt/base.py
+++ b/google/auth/crypt/base.py
@@ -1,4 +1,4 @@
-# Copyright 2016 Google Inc.
+# Copyright 2016 Google LLC
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
diff --git a/google/auth/crypt/rsa.py b/google/auth/crypt/rsa.py
index 5da1ba608..8b2d64c10 100644
--- a/google/auth/crypt/rsa.py
+++ b/google/auth/crypt/rsa.py
@@ -1,4 +1,4 @@
-# Copyright 2017 Google Inc.
+# Copyright 2017 Google LLC
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
diff --git a/google/auth/environment_vars.py b/google/auth/environment_vars.py
index 96d2ffc28..6a596f22d 100644
--- a/google/auth/environment_vars.py
+++ b/google/auth/environment_vars.py
@@ -1,4 +1,4 @@
-# Copyright 2016 Google Inc.
+# Copyright 2016 Google LLC
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
diff --git a/google/auth/exceptions.py b/google/auth/exceptions.py
index 2be9fd6df..e034c55cd 100644
--- a/google/auth/exceptions.py
+++ b/google/auth/exceptions.py
@@ -1,4 +1,4 @@
-# Copyright 2016 Google Inc.
+# Copyright 2016 Google LLC
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
diff --git a/google/auth/iam.py b/google/auth/iam.py
index 0ab5b5549..bd0500457 100644
--- a/google/auth/iam.py
+++ b/google/auth/iam.py
@@ -1,4 +1,4 @@
-# Copyright 2017 Google Inc.
+# Copyright 2017 Google LLC
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
diff --git a/google/auth/jwt.py b/google/auth/jwt.py
index 06e767968..cdd69ac8a 100644
--- a/google/auth/jwt.py
+++ b/google/auth/jwt.py
@@ -1,4 +1,4 @@
-# Copyright 2016 Google Inc.
+# Copyright 2016 Google LLC
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
diff --git a/google/auth/transport/__init__.py b/google/auth/transport/__init__.py
index 53aa4ba14..374e7b4d7 100644
--- a/google/auth/transport/__init__.py
+++ b/google/auth/transport/__init__.py
@@ -1,4 +1,4 @@
-# Copyright 2016 Google Inc.
+# Copyright 2016 Google LLC
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
diff --git a/google/auth/transport/_http_client.py b/google/auth/transport/_http_client.py
index b52ca7b50..c153763ef 100644
--- a/google/auth/transport/_http_client.py
+++ b/google/auth/transport/_http_client.py
@@ -1,4 +1,4 @@
-# Copyright 2016 Google Inc.
+# Copyright 2016 Google LLC
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
diff --git a/google/auth/transport/grpc.py b/google/auth/transport/grpc.py
index 80f6e81ba..fb90fbb4b 100644
--- a/google/auth/transport/grpc.py
+++ b/google/auth/transport/grpc.py
@@ -1,4 +1,4 @@
-# Copyright 2016 Google Inc.
+# Copyright 2016 Google LLC
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
diff --git a/google/auth/transport/requests.py b/google/auth/transport/requests.py
index 1c709d4f7..32f59e56b 100644
--- a/google/auth/transport/requests.py
+++ b/google/auth/transport/requests.py
@@ -1,4 +1,4 @@
-# Copyright 2016 Google Inc.
+# Copyright 2016 Google LLC
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
diff --git a/google/auth/transport/urllib3.py b/google/auth/transport/urllib3.py
index dbb186bb1..d1905e94e 100644
--- a/google/auth/transport/urllib3.py
+++ b/google/auth/transport/urllib3.py
@@ -1,4 +1,4 @@
-# Copyright 2016 Google Inc.
+# Copyright 2016 Google LLC
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
diff --git a/google/oauth2/__init__.py b/google/oauth2/__init__.py
index 6d3ee7f98..4fb71fd1a 100644
--- a/google/oauth2/__init__.py
+++ b/google/oauth2/__init__.py
@@ -1,4 +1,4 @@
-# Copyright 2016 Google Inc.
+# Copyright 2016 Google LLC
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
diff --git a/google/oauth2/_client.py b/google/oauth2/_client.py
index 4ba31a87a..448716329 100644
--- a/google/oauth2/_client.py
+++ b/google/oauth2/_client.py
@@ -1,4 +1,4 @@
-# Copyright 2016 Google Inc.
+# Copyright 2016 Google LLC
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
diff --git a/google/oauth2/credentials.py b/google/oauth2/credentials.py
index 71d2f6107..1adcbf675 100644
--- a/google/oauth2/credentials.py
+++ b/google/oauth2/credentials.py
@@ -1,4 +1,4 @@
-# Copyright 2016 Google Inc.
+# Copyright 2016 Google LLC
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
diff --git a/google/oauth2/id_token.py b/google/oauth2/id_token.py
index bc4844513..5113c9926 100644
--- a/google/oauth2/id_token.py
+++ b/google/oauth2/id_token.py
@@ -1,4 +1,4 @@
-# Copyright 2016 Google Inc.
+# Copyright 2016 Google LLC
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
@@ -67,7 +67,7 @@
 
 # The URL that provides public certificates for verifying ID tokens issued
 # by Google's OAuth 2.0 authorization server.
-_GOOGLE_OAUTH2_CERTS_URL = "https://www.googleapis.com/oauth2/v1/certs"
+_GOOGLE_OAUTH2_CERTS_URL = "https://www.googleapis.com/oauth2/v3/certs"
 
 # The URL that provides public certificates for verifying ID tokens issued
 # by Firebase and the Google APIs infrastructure
diff --git a/google/oauth2/service_account.py b/google/oauth2/service_account.py
index 17fdd516d..af86588d5 100644
--- a/google/oauth2/service_account.py
+++ b/google/oauth2/service_account.py
@@ -1,4 +1,4 @@
-# Copyright 2016 Google Inc.
+# Copyright 2016 Google LLC
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
diff --git a/noxfile.py b/noxfile.py
index e170ee51d..d75361f73 100644
--- a/noxfile.py
+++ b/noxfile.py
@@ -25,6 +25,7 @@
     "requests",
     "urllib3",
     "cryptography",
+    "responses",
     "grpcio",
 ]
 BLACK_VERSION = "black==19.3b0"
diff --git a/setup.py b/setup.py
index bbed85e50..09ef6d14a 100644
--- a/setup.py
+++ b/setup.py
@@ -30,7 +30,7 @@
 with io.open("README.rst", "r") as fh:
     long_description = fh.read()
 
-version = "1.11.0"
+version = "1.11.1"
 
 setup(
     name="google-auth",
diff --git a/system_tests/app_engine_test_app/appengine_config.py b/system_tests/app_engine_test_app/appengine_config.py
index 6339909e5..5a832ac6f 100644
--- a/system_tests/app_engine_test_app/appengine_config.py
+++ b/system_tests/app_engine_test_app/appengine_config.py
@@ -1,4 +1,4 @@
-# Copyright 2016 Google Inc.
+# Copyright 2016 Google LLC
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
diff --git a/system_tests/app_engine_test_app/main.py b/system_tests/app_engine_test_app/main.py
index a3354acde..33e61d07b 100644
--- a/system_tests/app_engine_test_app/main.py
+++ b/system_tests/app_engine_test_app/main.py
@@ -1,4 +1,4 @@
-# Copyright 2016 Google Inc. All Rights Reserved.
+# Copyright 2016 Google LLC All Rights Reserved.
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
diff --git a/system_tests/conftest.py b/system_tests/conftest.py
index 3f089c4b4..189300707 100644
--- a/system_tests/conftest.py
+++ b/system_tests/conftest.py
@@ -1,4 +1,4 @@
-# Copyright 2016 Google Inc.
+# Copyright 2016 Google LLC
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
diff --git a/system_tests/noxfile.py b/system_tests/noxfile.py
index 864a5be32..e37049e52 100644
--- a/system_tests/noxfile.py
+++ b/system_tests/noxfile.py
@@ -1,4 +1,4 @@
-# Copyright 2016 Google Inc.
+# Copyright 2016 Google LLC
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
diff --git a/system_tests/test_app_engine.py b/system_tests/test_app_engine.py
index cdf2be436..45a1989a4 100644
--- a/system_tests/test_app_engine.py
+++ b/system_tests/test_app_engine.py
@@ -1,4 +1,4 @@
-# Copyright 2016 Google Inc.
+# Copyright 2016 Google LLC
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
diff --git a/system_tests/test_compute_engine.py b/system_tests/test_compute_engine.py
index 44f162792..3217c958a 100644
--- a/system_tests/test_compute_engine.py
+++ b/system_tests/test_compute_engine.py
@@ -1,4 +1,4 @@
-# Copyright 2016 Google Inc.
+# Copyright 2016 Google LLC
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
diff --git a/system_tests/test_default.py b/system_tests/test_default.py
index 22213e60f..560ab3284 100644
--- a/system_tests/test_default.py
+++ b/system_tests/test_default.py
@@ -1,4 +1,4 @@
-# Copyright 2016 Google Inc.
+# Copyright 2016 Google LLC
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
diff --git a/system_tests/test_grpc.py b/system_tests/test_grpc.py
index f025fc0b7..650fa96a4 100644
--- a/system_tests/test_grpc.py
+++ b/system_tests/test_grpc.py
@@ -1,4 +1,4 @@
-# Copyright 2016 Google Inc.
+# Copyright 2016 Google LLC
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
diff --git a/system_tests/test_oauth2_credentials.py b/system_tests/test_oauth2_credentials.py
index 3ecd85078..663d4fc21 100644
--- a/system_tests/test_oauth2_credentials.py
+++ b/system_tests/test_oauth2_credentials.py
@@ -1,4 +1,4 @@
-# Copyright 2016 Google Inc.
+# Copyright 2016 Google LLC
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
diff --git a/system_tests/test_service_account.py b/system_tests/test_service_account.py
index 793760199..262ce84f5 100644
--- a/system_tests/test_service_account.py
+++ b/system_tests/test_service_account.py
@@ -1,4 +1,4 @@
-# Copyright 2016 Google Inc.
+# Copyright 2016 Google LLC
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
diff --git a/tests/compute_engine/test__metadata.py b/tests/compute_engine/test__metadata.py
index 0898e1f4e..8b5eece7a 100644
--- a/tests/compute_engine/test__metadata.py
+++ b/tests/compute_engine/test__metadata.py
@@ -1,4 +1,4 @@
-# Copyright 2016 Google Inc.
+# Copyright 2016 Google LLC
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
diff --git a/tests/compute_engine/test_credentials.py b/tests/compute_engine/test_credentials.py
index ec9d13b63..b861984e0 100644
--- a/tests/compute_engine/test_credentials.py
+++ b/tests/compute_engine/test_credentials.py
@@ -1,4 +1,4 @@
-# Copyright 2016 Google Inc.
+# Copyright 2016 Google LLC
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
@@ -11,17 +11,19 @@
 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 # See the License for the specific language governing permissions and
 # limitations under the License.
-
+import base64
 import datetime
 
 import mock
 import pytest
+import responses
 
 from google.auth import _helpers
 from google.auth import exceptions
 from google.auth import jwt
 from google.auth import transport
 from google.auth.compute_engine import credentials
+from google.auth.transport import requests
 
 
 class TestCredentials(object):
@@ -270,6 +272,84 @@ def test_with_target_audience(self, sign, get, utcnow):
             "target_audience": "https://actually.not",
         }
 
+        # Check that the signer have been initialized with a Request object
+        assert isinstance(self.credentials._signer._request, transport.Request)
+
+    @responses.activate
+    def test_with_target_audience_integration(self):
+        """ Test that it is possible to refresh credentials
+        generated from `with_target_audience`.
+
+        Instead of mocking the methods, the HTTP responses
+        have been mocked.
+        """
+
+        # mock information about credentials
+        responses.add(
+            responses.GET,
+            "http://metadata.google.internal/computeMetadata/v1/instance/"
+            "service-accounts/default/?recursive=true",
+            status=200,
+            content_type="application/json",
+            json={
+                "scopes": "email",
+                "email": "service-account@example.com",
+                "aliases": ["default"],
+            },
+        )
+
+        # mock token for credentials
+        responses.add(
+            responses.GET,
+            "http://metadata.google.internal/computeMetadata/v1/instance/"
+            "service-accounts/service-account@example.com/token",
+            status=200,
+            content_type="application/json",
+            json={
+                "access_token": "some-token",
+                "expires_in": 3210,
+                "token_type": "Bearer",
+            },
+        )
+
+        # mock sign blob endpoint
+        signature = base64.b64encode(b"some-signature").decode("utf-8")
+        responses.add(
+            responses.POST,
+            "https://iam.googleapis.com/v1/projects/-/serviceAccounts/"
+            "service-account@example.com:signBlob?alt=json",
+            status=200,
+            content_type="application/json",
+            json={"keyId": "some-key-id", "signature": signature},
+        )
+
+        id_token = "{}.{}.{}".format(
+            base64.b64encode(b'{"some":"some"}').decode("utf-8"),
+            base64.b64encode(b'{"exp": 3210}').decode("utf-8"),
+            base64.b64encode(b"token").decode("utf-8"),
+        )
+
+        # mock id token endpoint
+        responses.add(
+            responses.POST,
+            "https://www.googleapis.com/oauth2/v4/token",
+            status=200,
+            content_type="application/json",
+            json={"id_token": id_token, "expiry": 3210},
+        )
+
+        self.credentials = credentials.IDTokenCredentials(
+            request=requests.Request(),
+            service_account_email="service-account@example.com",
+            target_audience="https://audience.com",
+        )
+
+        self.credentials = self.credentials.with_target_audience("https://actually.not")
+
+        self.credentials.refresh(requests.Request())
+
+        assert self.credentials.token is not None
+
     @mock.patch(
         "google.auth._helpers.utcnow",
         return_value=datetime.datetime.utcfromtimestamp(0),
diff --git a/tests/conftest.py b/tests/conftest.py
index 2ccc132e2..7f9a968b7 100644
--- a/tests/conftest.py
+++ b/tests/conftest.py
@@ -1,4 +1,4 @@
-# Copyright 2016 Google Inc.
+# Copyright 2016 Google LLC
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
diff --git a/tests/crypt/test__cryptography_rsa.py b/tests/crypt/test__cryptography_rsa.py
index 10f926bc7..dbf07c780 100644
--- a/tests/crypt/test__cryptography_rsa.py
+++ b/tests/crypt/test__cryptography_rsa.py
@@ -1,4 +1,4 @@
-# Copyright 2016 Google Inc.
+# Copyright 2016 Google LLC
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
diff --git a/tests/crypt/test__python_rsa.py b/tests/crypt/test__python_rsa.py
index 08b9503a2..886ee55a2 100644
--- a/tests/crypt/test__python_rsa.py
+++ b/tests/crypt/test__python_rsa.py
@@ -1,4 +1,4 @@
-# Copyright 2016 Google Inc.
+# Copyright 2016 Google LLC
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
diff --git a/tests/crypt/test_crypt.py b/tests/crypt/test_crypt.py
index 16ff2e0bd..e80502e9b 100644
--- a/tests/crypt/test_crypt.py
+++ b/tests/crypt/test_crypt.py
@@ -1,4 +1,4 @@
-# Copyright 2016 Google Inc.
+# Copyright 2016 Google LLC
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
diff --git a/tests/oauth2/test__client.py b/tests/oauth2/test__client.py
index 052390aa8..c3ae2af98 100644
--- a/tests/oauth2/test__client.py
+++ b/tests/oauth2/test__client.py
@@ -1,4 +1,4 @@
-# Copyright 2016 Google Inc.
+# Copyright 2016 Google LLC
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
diff --git a/tests/oauth2/test_credentials.py b/tests/oauth2/test_credentials.py
index af10f2fa4..bdb63e9dd 100644
--- a/tests/oauth2/test_credentials.py
+++ b/tests/oauth2/test_credentials.py
@@ -1,4 +1,4 @@
-# Copyright 2016 Google Inc.
+# Copyright 2016 Google LLC
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
diff --git a/tests/oauth2/test_service_account.py b/tests/oauth2/test_service_account.py
index 0f9d4600c..897374a6f 100644
--- a/tests/oauth2/test_service_account.py
+++ b/tests/oauth2/test_service_account.py
@@ -1,4 +1,4 @@
-# Copyright 2016 Google Inc.
+# Copyright 2016 Google LLC
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
diff --git a/tests/test__cloud_sdk.py b/tests/test__cloud_sdk.py
index c5c5c2769..049ed9978 100644
--- a/tests/test__cloud_sdk.py
+++ b/tests/test__cloud_sdk.py
@@ -1,4 +1,4 @@
-# Copyright 2016 Google Inc.
+# Copyright 2016 Google LLC
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
diff --git a/tests/test__default.py b/tests/test__default.py
index 2c86f3ffb..35000b04d 100644
--- a/tests/test__default.py
+++ b/tests/test__default.py
@@ -1,4 +1,4 @@
-# Copyright 2016 Google Inc.
+# Copyright 2016 Google LLC
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
diff --git a/tests/test__helpers.py b/tests/test__helpers.py
index 3714af7d3..0c0bad2d2 100644
--- a/tests/test__helpers.py
+++ b/tests/test__helpers.py
@@ -1,4 +1,4 @@
-# Copyright 2016 Google Inc.
+# Copyright 2016 Google LLC
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
diff --git a/tests/test__oauth2client.py b/tests/test__oauth2client.py
index 520f9432a..6b1112b50 100644
--- a/tests/test__oauth2client.py
+++ b/tests/test__oauth2client.py
@@ -1,4 +1,4 @@
-# Copyright 2016 Google Inc.
+# Copyright 2016 Google LLC
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
diff --git a/tests/test__service_account_info.py b/tests/test__service_account_info.py
index 4419f670b..13b2f85a2 100644
--- a/tests/test__service_account_info.py
+++ b/tests/test__service_account_info.py
@@ -1,4 +1,4 @@
-# Copyright 2016 Google Inc.
+# Copyright 2016 Google LLC
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
diff --git a/tests/test_app_engine.py b/tests/test_app_engine.py
index 9559a2cd2..9dfdfa65b 100644
--- a/tests/test_app_engine.py
+++ b/tests/test_app_engine.py
@@ -1,4 +1,4 @@
-# Copyright 2016 Google Inc.
+# Copyright 2016 Google LLC
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
diff --git a/tests/test_credentials.py b/tests/test_credentials.py
index 2a89b01b6..16ddd9b44 100644
--- a/tests/test_credentials.py
+++ b/tests/test_credentials.py
@@ -1,4 +1,4 @@
-# Copyright 2016 Google Inc.
+# Copyright 2016 Google LLC
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
diff --git a/tests/test_iam.py b/tests/test_iam.py
index 52ab9bd82..c98a138f9 100644
--- a/tests/test_iam.py
+++ b/tests/test_iam.py
@@ -1,4 +1,4 @@
-# Copyright 2017 Google Inc.
+# Copyright 2017 Google LLC
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
diff --git a/tests/transport/compliance.py b/tests/transport/compliance.py
index dc7c58be5..e093d761d 100644
--- a/tests/transport/compliance.py
+++ b/tests/transport/compliance.py
@@ -1,4 +1,4 @@
-# Copyright 2016 Google Inc.
+# Copyright 2016 Google LLC
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
diff --git a/tests/transport/test__http_client.py b/tests/transport/test__http_client.py
index 9e7f108ae..c176cb2f4 100644
--- a/tests/transport/test__http_client.py
+++ b/tests/transport/test__http_client.py
@@ -1,4 +1,4 @@
-# Copyright 2016 Google Inc.
+# Copyright 2016 Google LLC
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
diff --git a/tests/transport/test_grpc.py b/tests/transport/test_grpc.py
index ca12385dd..857c32bb9 100644
--- a/tests/transport/test_grpc.py
+++ b/tests/transport/test_grpc.py
@@ -1,4 +1,4 @@
-# Copyright 2016 Google Inc.
+# Copyright 2016 Google LLC
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
diff --git a/tests/transport/test_requests.py b/tests/transport/test_requests.py
index f0321c81b..9aafd88b1 100644
--- a/tests/transport/test_requests.py
+++ b/tests/transport/test_requests.py
@@ -1,4 +1,4 @@
-# Copyright 2016 Google Inc.
+# Copyright 2016 Google LLC
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
diff --git a/tests/transport/test_urllib3.py b/tests/transport/test_urllib3.py
index 1d7ce5a0e..8a307332a 100644
--- a/tests/transport/test_urllib3.py
+++ b/tests/transport/test_urllib3.py
@@ -1,4 +1,4 @@
-# Copyright 2016 Google Inc.
+# Copyright 2016 Google LLC
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.