diff --git a/.github/.OwlBot.lock.yaml b/.github/.OwlBot.lock.yaml
new file mode 100644
index 000000000..c2fc27e46
--- /dev/null
+++ b/.github/.OwlBot.lock.yaml
@@ -0,0 +1,18 @@
+# Copyright 2021 Google LLC
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# 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.
+
+docker:
+  image: gcr.io/repo-automation-bots/owlbot-python:latest
+  digest: sha256:c66ba3c8d7bc8566f47df841f98cd0097b28fff0b1864c86f5817f4c8c3e8600
+
diff --git a/.github/.OwlBot.yaml b/.github/.OwlBot.yaml
new file mode 100644
index 000000000..892fbc291
--- /dev/null
+++ b/.github/.OwlBot.yaml
@@ -0,0 +1,18 @@
+# Copyright 2021 Google LLC
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# 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.
+
+docker:
+  image: gcr.io/repo-automation-bots/owlbot-python:latest
+
+begin-after-commit-hash: ee56c3493ec6aeb237ff515ecea949710944a20f
diff --git a/.kokoro/release.sh b/.kokoro/release.sh
index ded1baeda..967bc917e 100755
--- a/.kokoro/release.sh
+++ b/.kokoro/release.sh
@@ -26,7 +26,7 @@ python3 -m pip install --upgrade twine wheel setuptools
 export PYTHONUNBUFFERED=1
 
 # Move into the package, build the distribution and upload.
-TWINE_PASSWORD=$(cat "${KOKORO_KEYSTORE_DIR}/73713_google_cloud_pypi_password")
+TWINE_PASSWORD=$(cat "${KOKORO_GFILE_DIR}/secret_manager/google-cloud-pypi-token")
 cd github/google-auth-library-python
 python3 setup.py sdist bdist_wheel
-twine upload --username gcloudpypi --password "${TWINE_PASSWORD}" dist/*
+twine upload --username __token__ --password "${TWINE_PASSWORD}" dist/*
diff --git a/.kokoro/release/common.cfg b/.kokoro/release/common.cfg
index b56ca902d..07334fd50 100644
--- a/.kokoro/release/common.cfg
+++ b/.kokoro/release/common.cfg
@@ -23,18 +23,8 @@ env_vars: {
     value: "github/google-auth-library-python/.kokoro/release.sh"
 }
 
-# Fetch PyPI password	
-before_action {	
-  fetch_keystore {	
-    keystore_resource {	
-      keystore_config_id: 73713	
-      keyname: "google_cloud_pypi_password"	
-    }	
-  }	
-}
-
 # Tokens needed to report release status back to GitHub
 env_vars: {
   key: "SECRET_MANAGER_KEYS"
-  value: "releasetool-publish-reporter-app,releasetool-publish-reporter-googleapis-installation,releasetool-publish-reporter-pem"
-}
\ No newline at end of file
+  value: "releasetool-publish-reporter-app,releasetool-publish-reporter-googleapis-installation,releasetool-publish-reporter-pem,google-cloud-pypi-token"
+}
diff --git a/.kokoro/samples/python3.6/periodic-head.cfg b/.kokoro/samples/python3.6/periodic-head.cfg
new file mode 100644
index 000000000..f9cfcd33e
--- /dev/null
+++ b/.kokoro/samples/python3.6/periodic-head.cfg
@@ -0,0 +1,11 @@
+# Format: //devtools/kokoro/config/proto/build.proto
+
+env_vars: {
+    key: "INSTALL_LIBRARY_FROM_SOURCE"
+    value: "True"
+}
+
+env_vars: {
+    key: "TRAMPOLINE_BUILD_FILE"
+    value: "github/python-pubsub/.kokoro/test-samples-against-head.sh"
+}
diff --git a/.kokoro/samples/python3.7/periodic-head.cfg b/.kokoro/samples/python3.7/periodic-head.cfg
new file mode 100644
index 000000000..f9cfcd33e
--- /dev/null
+++ b/.kokoro/samples/python3.7/periodic-head.cfg
@@ -0,0 +1,11 @@
+# Format: //devtools/kokoro/config/proto/build.proto
+
+env_vars: {
+    key: "INSTALL_LIBRARY_FROM_SOURCE"
+    value: "True"
+}
+
+env_vars: {
+    key: "TRAMPOLINE_BUILD_FILE"
+    value: "github/python-pubsub/.kokoro/test-samples-against-head.sh"
+}
diff --git a/.kokoro/samples/python3.8/periodic-head.cfg b/.kokoro/samples/python3.8/periodic-head.cfg
new file mode 100644
index 000000000..f9cfcd33e
--- /dev/null
+++ b/.kokoro/samples/python3.8/periodic-head.cfg
@@ -0,0 +1,11 @@
+# Format: //devtools/kokoro/config/proto/build.proto
+
+env_vars: {
+    key: "INSTALL_LIBRARY_FROM_SOURCE"
+    value: "True"
+}
+
+env_vars: {
+    key: "TRAMPOLINE_BUILD_FILE"
+    value: "github/python-pubsub/.kokoro/test-samples-against-head.sh"
+}
diff --git a/.kokoro/test-samples-against-head.sh b/.kokoro/test-samples-against-head.sh
new file mode 100755
index 000000000..e974d9d01
--- /dev/null
+++ b/.kokoro/test-samples-against-head.sh
@@ -0,0 +1,28 @@
+#!/bin/bash
+# Copyright 2020 Google LLC
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# 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.
+
+# A customized test runner for samples.
+#
+# For periodic builds, you can specify this file for testing against head.
+
+# `-e` enables the script to automatically fail when a command fails
+# `-o pipefail` sets the exit code to the rightmost comment to exit with a non-zero
+set -eo pipefail
+# Enables `**` to include files nested inside sub-folders
+shopt -s globstar
+
+cd github/google-auth-library-python
+
+exec .kokoro/test-samples-impl.sh
diff --git a/.kokoro/test-samples-impl.sh b/.kokoro/test-samples-impl.sh
new file mode 100755
index 000000000..cf5de74c1
--- /dev/null
+++ b/.kokoro/test-samples-impl.sh
@@ -0,0 +1,102 @@
+#!/bin/bash
+# Copyright 2021 Google LLC
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# 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.
+
+
+# `-e` enables the script to automatically fail when a command fails
+# `-o pipefail` sets the exit code to the rightmost comment to exit with a non-zero
+set -eo pipefail
+# Enables `**` to include files nested inside sub-folders
+shopt -s globstar
+
+# Exit early if samples directory doesn't exist
+if [ ! -d "./samples" ]; then
+  echo "No tests run. `./samples` not found"
+  exit 0
+fi
+
+# Disable buffering, so that the logs stream through.
+export PYTHONUNBUFFERED=1
+
+# Debug: show build environment
+env | grep KOKORO
+
+# Install nox
+python3.6 -m pip install --upgrade --quiet nox
+
+# Use secrets acessor service account to get secrets
+if [[ -f "${KOKORO_GFILE_DIR}/secrets_viewer_service_account.json" ]]; then
+    gcloud auth activate-service-account \
+	   --key-file="${KOKORO_GFILE_DIR}/secrets_viewer_service_account.json" \
+	   --project="cloud-devrel-kokoro-resources"
+fi
+
+# This script will create 3 files:
+# - testing/test-env.sh
+# - testing/service-account.json
+# - testing/client-secrets.json
+./scripts/decrypt-secrets.sh
+
+source ./testing/test-env.sh
+export GOOGLE_APPLICATION_CREDENTIALS=$(pwd)/testing/service-account.json
+
+# For cloud-run session, we activate the service account for gcloud sdk.
+gcloud auth activate-service-account \
+       --key-file "${GOOGLE_APPLICATION_CREDENTIALS}"
+
+export GOOGLE_CLIENT_SECRETS=$(pwd)/testing/client-secrets.json
+
+echo -e "\n******************** TESTING PROJECTS ********************"
+
+# Switch to 'fail at end' to allow all tests to complete before exiting.
+set +e
+# Use RTN to return a non-zero value if the test fails.
+RTN=0
+ROOT=$(pwd)
+# Find all requirements.txt in the samples directory (may break on whitespace).
+for file in samples/**/requirements.txt; do
+    cd "$ROOT"
+    # Navigate to the project folder.
+    file=$(dirname "$file")
+    cd "$file"
+
+    echo "------------------------------------------------------------"
+    echo "- testing $file"
+    echo "------------------------------------------------------------"
+
+    # Use nox to execute the tests for the project.
+    python3.6 -m nox -s "$RUN_TESTS_SESSION"
+    EXIT=$?
+
+    # If this is a periodic build, send the test log to the FlakyBot.
+    # See https://github.com/googleapis/repo-automation-bots/tree/master/packages/flakybot.
+    if [[ $KOKORO_BUILD_ARTIFACTS_SUBDIR = *"periodic"* ]]; then
+      chmod +x $KOKORO_GFILE_DIR/linux_amd64/flakybot
+      $KOKORO_GFILE_DIR/linux_amd64/flakybot
+    fi
+
+    if [[ $EXIT -ne 0 ]]; then
+      RTN=1
+      echo -e "\n Testing failed: Nox returned a non-zero exit code. \n"
+    else
+      echo -e "\n Testing completed.\n"
+    fi
+
+done
+cd "$ROOT"
+
+# Workaround for Kokoro permissions issue: delete secrets
+rm testing/{test-env.sh,client-secrets.json,service-account.json}
+
+exit "$RTN"
diff --git a/.kokoro/test-samples.sh b/.kokoro/test-samples.sh
index dbfe9fbb0..6cea6d4f3 100755
--- a/.kokoro/test-samples.sh
+++ b/.kokoro/test-samples.sh
@@ -13,6 +13,10 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+# The default test runner for samples.
+#
+# For periodic builds, we rewinds the repo to the latest release, and
+# run test-samples-impl.sh.
 
 # `-e` enables the script to automatically fail when a command fails
 # `-o pipefail` sets the exit code to the rightmost comment to exit with a non-zero
@@ -24,87 +28,19 @@ cd github/google-auth-library-python
 
 # Run periodic samples tests at latest release
 if [[ $KOKORO_BUILD_ARTIFACTS_SUBDIR = *"periodic"* ]]; then
+    # preserving the test runner implementation.
+    cp .kokoro/test-samples-impl.sh "${TMPDIR}/test-samples-impl.sh"
+    echo "--- IMPORTANT IMPORTANT IMPORTANT ---"
+    echo "Now we rewind the repo back to the latest release..."
     LATEST_RELEASE=$(git describe --abbrev=0 --tags)
     git checkout $LATEST_RELEASE
-fi
-
-# Exit early if samples directory doesn't exist
-if [ ! -d "./samples" ]; then
-  echo "No tests run. `./samples` not found"
-  exit 0
-fi
-
-# Disable buffering, so that the logs stream through.
-export PYTHONUNBUFFERED=1
-
-# Debug: show build environment
-env | grep KOKORO
-
-# Install nox
-python3.6 -m pip install --upgrade --quiet nox
-
-# Use secrets acessor service account to get secrets
-if [[ -f "${KOKORO_GFILE_DIR}/secrets_viewer_service_account.json" ]]; then
-    gcloud auth activate-service-account \
-	   --key-file="${KOKORO_GFILE_DIR}/secrets_viewer_service_account.json" \
-	   --project="cloud-devrel-kokoro-resources"
-fi
-
-# This script will create 3 files:
-# - testing/test-env.sh
-# - testing/service-account.json
-# - testing/client-secrets.json
-./scripts/decrypt-secrets.sh
-
-source ./testing/test-env.sh
-export GOOGLE_APPLICATION_CREDENTIALS=$(pwd)/testing/service-account.json
-
-# For cloud-run session, we activate the service account for gcloud sdk.
-gcloud auth activate-service-account \
-       --key-file "${GOOGLE_APPLICATION_CREDENTIALS}"
-
-export GOOGLE_CLIENT_SECRETS=$(pwd)/testing/client-secrets.json
-
-echo -e "\n******************** TESTING PROJECTS ********************"
-
-# Switch to 'fail at end' to allow all tests to complete before exiting.
-set +e
-# Use RTN to return a non-zero value if the test fails.
-RTN=0
-ROOT=$(pwd)
-# Find all requirements.txt in the samples directory (may break on whitespace).
-for file in samples/**/requirements.txt; do
-    cd "$ROOT"
-    # Navigate to the project folder.
-    file=$(dirname "$file")
-    cd "$file"
-
-    echo "------------------------------------------------------------"
-    echo "- testing $file"
-    echo "------------------------------------------------------------"
-
-    # Use nox to execute the tests for the project.
-    python3.6 -m nox -s "$RUN_TESTS_SESSION"
-    EXIT=$?
-
-    # If this is a periodic build, send the test log to the FlakyBot.
-    # See https://github.com/googleapis/repo-automation-bots/tree/master/packages/flakybot.
-    if [[ $KOKORO_BUILD_ARTIFACTS_SUBDIR = *"periodic"* ]]; then
-      chmod +x $KOKORO_GFILE_DIR/linux_amd64/flakybot
-      $KOKORO_GFILE_DIR/linux_amd64/flakybot
+    echo "The current head is: "
+    echo $(git rev-parse --verify HEAD)
+    echo "--- IMPORTANT IMPORTANT IMPORTANT ---"
+    # move back the test runner implementation if there's no file.
+    if [ ! -f .kokoro/test-samples-impl.sh ]; then
+	cp "${TMPDIR}/test-samples-impl.sh" .kokoro/test-samples-impl.sh
     fi
+fi
 
-    if [[ $EXIT -ne 0 ]]; then
-      RTN=1
-      echo -e "\n Testing failed: Nox returned a non-zero exit code. \n"
-    else
-      echo -e "\n Testing completed.\n"
-    fi
-
-done
-cd "$ROOT"
-
-# Workaround for Kokoro permissions issue: delete secrets
-rm testing/{test-env.sh,client-secrets.json,service-account.json}
-
-exit "$RTN"
+exec .kokoro/test-samples-impl.sh
diff --git a/CHANGELOG.md b/CHANGELOG.md
index d75f6028d..ef65ebd9e 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,6 +4,15 @@
 
 [1]: https://pypi.org/project/google-auth/#history
 
+### [1.30.2](https://www.github.com/googleapis/google-auth-library-python/compare/v1.30.1...v1.30.2) (2021-06-03)
+
+
+### Bug Fixes
+
+* **dependencies:** add urllib3 and requests to aiohttp extra ([#755](https://www.github.com/googleapis/google-auth-library-python/issues/755)) ([a923442](https://www.github.com/googleapis/google-auth-library-python/commit/a9234423cb2b69068fc0d30a5a0ee86a599ab8b7))
+* enforce constraints during unit tests ([#760](https://www.github.com/googleapis/google-auth-library-python/issues/760)) ([1a6496a](https://www.github.com/googleapis/google-auth-library-python/commit/1a6496abfc17ab781bfa485dc74d0f7dbbe0c44b)), closes [#759](https://www.github.com/googleapis/google-auth-library-python/issues/759)
+* session object was never used in aiohttp request ([#700](https://www.github.com/googleapis/google-auth-library-python/issues/700)) ([#701](https://www.github.com/googleapis/google-auth-library-python/issues/701)) ([09e0389](https://www.github.com/googleapis/google-auth-library-python/commit/09e0389db72cc9d6c5dde34864cb54d717dc0b92))
+
 ### [1.30.1](https://www.github.com/googleapis/google-auth-library-python/compare/v1.30.0...v1.30.1) (2021-05-20)
 
 
diff --git a/google/auth/transport/_aiohttp_requests.py b/google/auth/transport/_aiohttp_requests.py
index 4293810dd..ab7dfef67 100644
--- a/google/auth/transport/_aiohttp_requests.py
+++ b/google/auth/transport/_aiohttp_requests.py
@@ -138,7 +138,12 @@ class Request(transport.Request):
     """
 
     def __init__(self, session=None):
-        self.session = None
+        # TODO: Use auto_decompress property for aiohttp 3.7+
+        if session is not None and session._auto_decompress:
+            raise ValueError(
+                "Client sessions with auto_decompress=True are not supported."
+            )
+        self.session = session
 
     async def __call__(
         self,
diff --git a/google/auth/version.py b/google/auth/version.py
index 6f306a7f7..5e7a79cc2 100644
--- a/google/auth/version.py
+++ b/google/auth/version.py
@@ -12,4 +12,4 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-__version__ = "1.30.1"
+__version__ = "1.30.2"
diff --git a/noxfile.py b/noxfile.py
index 0bd7f6c6c..94661df31 100644
--- a/noxfile.py
+++ b/noxfile.py
@@ -12,10 +12,14 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-import shutil
 import os
+import pathlib
+import shutil
+
 import nox
 
+CURRENT_DIRECTORY = pathlib.Path(__file__).parent.absolute()
+
 TEST_DEPENDENCIES = [
     "flask",
     "freezegun",
@@ -69,13 +73,14 @@ def lint(session):
     )
 
 
-@nox.session(python="3.6")
+@nox.session(python="3.8")
 def blacken(session):
     """Run black.
     Format code to uniform standard.
-    This currently uses Python 3.6 due to the automated Kokoro run of synthtool.
-    That run uses an image that doesn't have 3.6 installed. Before updating this
-    check the state of the `gcp_ubuntu_config` we use for that Kokoro run.
+    The Python version should be consistent with what is
+    supplied in the Python Owlbot postprocessor.
+
+    https://github.com/googleapis/synthtool/blob/master/docker/owlbot/python/Dockerfile
     """
     session.install(BLACK_VERSION)
     session.run("black", *BLACK_PATHS)
@@ -83,15 +88,20 @@ def blacken(session):
 
 @nox.session(python=["3.6", "3.7", "3.8", "3.9"])
 def unit(session):
-    session.install(*TEST_DEPENDENCIES)
-    session.install(*(ASYNC_DEPENDENCIES))
-    session.install(".")
+    constraints_path = str(
+        CURRENT_DIRECTORY / "testing" / f"constraints-{session.python}.txt"
+    )
+    add_constraints = ["-c", constraints_path]
+    session.install(*(TEST_DEPENDENCIES + add_constraints))
+    session.install(*(ASYNC_DEPENDENCIES + add_constraints))
+    session.install(".", *add_constraints)
     session.run(
         "pytest",
         f"--junitxml=unit_{session.python}_sponge_log.xml",
         "--cov=google.auth",
         "--cov=google.oauth2",
         "--cov=tests",
+        "--cov-report=term-missing",
         "tests",
         "tests_async",
     )
@@ -122,7 +132,7 @@ def cover(session):
         "--cov=google.oauth2",
         "--cov=tests",
         "--cov=tests_async",
-        "--cov-report=",
+        "--cov-report=term-missing",
         "tests",
         "tests_async",
     )
diff --git a/synth.py b/owlbot.py
similarity index 100%
rename from synth.py
rename to owlbot.py
diff --git a/setup.py b/setup.py
index ef723f8af..a9bfc9738 100644
--- a/setup.py
+++ b/setup.py
@@ -31,7 +31,10 @@
 )
 
 extras = {
-    "aiohttp": "aiohttp >= 3.6.2, < 4.0.0dev; python_version>='3.6'",
+    "aiohttp": [
+        "aiohttp >= 3.6.2, < 4.0.0dev; python_version>='3.6'",
+        "requests >= 2.20.0, < 3.0.0dev",
+    ],
     "pyopenssl": "pyopenssl>=20.0.0",
     "reauth": "pyu2f>=0.1.5",
 }
diff --git a/synth.metadata b/synth.metadata
deleted file mode 100644
index 0de642bf7..000000000
--- a/synth.metadata
+++ /dev/null
@@ -1,54 +0,0 @@
-{
-  "sources": [
-    {
-      "git": {
-        "name": ".",
-        "remote": "https://github.com/googleapis/google-auth-library-python.git",
-        "sha": "f062da8392c32fb3306cdc6e4dbae78212aa0dc7"
-      }
-    },
-    {
-      "git": {
-        "name": "synthtool",
-        "remote": "https://github.com/googleapis/synthtool.git",
-        "sha": "16ec872dd898d7de6e1822badfac32484b5d9031"
-      }
-    }
-  ],
-  "generatedFiles": [
-    ".kokoro/build.sh",
-    ".kokoro/continuous/common.cfg",
-    ".kokoro/continuous/continuous.cfg",
-    ".kokoro/docker/docs/Dockerfile",
-    ".kokoro/docker/docs/fetch_gpg_keys.sh",
-    ".kokoro/docs/common.cfg",
-    ".kokoro/docs/docs-presubmit.cfg",
-    ".kokoro/docs/docs.cfg",
-    ".kokoro/populate-secrets.sh",
-    ".kokoro/presubmit/common.cfg",
-    ".kokoro/presubmit/presubmit.cfg",
-    ".kokoro/publish-docs.sh",
-    ".kokoro/release.sh",
-    ".kokoro/release/common.cfg",
-    ".kokoro/release/release.cfg",
-    ".kokoro/samples/lint/common.cfg",
-    ".kokoro/samples/lint/continuous.cfg",
-    ".kokoro/samples/lint/periodic.cfg",
-    ".kokoro/samples/lint/presubmit.cfg",
-    ".kokoro/samples/python3.6/common.cfg",
-    ".kokoro/samples/python3.6/continuous.cfg",
-    ".kokoro/samples/python3.6/periodic.cfg",
-    ".kokoro/samples/python3.6/presubmit.cfg",
-    ".kokoro/samples/python3.7/common.cfg",
-    ".kokoro/samples/python3.7/continuous.cfg",
-    ".kokoro/samples/python3.7/periodic.cfg",
-    ".kokoro/samples/python3.7/presubmit.cfg",
-    ".kokoro/samples/python3.8/common.cfg",
-    ".kokoro/samples/python3.8/continuous.cfg",
-    ".kokoro/samples/python3.8/periodic.cfg",
-    ".kokoro/samples/python3.8/presubmit.cfg",
-    ".kokoro/test-samples.sh",
-    ".kokoro/trampoline.sh",
-    ".kokoro/trampoline_v2.sh"
-  ]
-}
\ No newline at end of file
diff --git a/system_tests/system_tests_async/conftest.py b/system_tests/system_tests_async/conftest.py
index 47a473e7f..966909924 100644
--- a/system_tests/system_tests_async/conftest.py
+++ b/system_tests/system_tests_async/conftest.py
@@ -26,9 +26,7 @@
 from google.auth.transport import _aiohttp_requests as aiohttp_requests
 from system_tests.system_tests_sync import conftest as sync_conftest
 
-ASYNC_REQUESTS_SESSION = aiohttp.ClientSession()
 
-ASYNC_REQUESTS_SESSION.verify = False
 TOKEN_INFO_URL = "https://www.googleapis.com/oauth2/v3/tokeninfo"
 
 
@@ -49,10 +47,18 @@ def authorized_user_file():
     """The full path to a valid authorized user file."""
     yield sync_conftest.AUTHORIZED_USER_FILE
 
+
+@pytest.fixture
+async def aiohttp_session():
+    async with aiohttp.ClientSession(auto_decompress=False) as session:
+        yield session
+
+
 @pytest.fixture(params=["aiohttp"])
-async def http_request(request):
+async def http_request(request, aiohttp_session):
     """A transport.request object."""
-    yield aiohttp_requests.Request(ASYNC_REQUESTS_SESSION)
+    yield aiohttp_requests.Request(aiohttp_session)
+
 
 @pytest.fixture
 async def token_info(http_request):
diff --git a/testing/constraints-3.6.txt b/testing/constraints-3.6.txt
index ff7f099d4..ad6f59846 100644
--- a/testing/constraints-3.6.txt
+++ b/testing/constraints-3.6.txt
@@ -9,6 +9,6 @@ cachetools==2.0.0
 pyasn1-modules==0.2.1
 setuptools==40.3.0
 six==1.9.0
-rsa==4.6
 rsa==3.1.4
-aiohttp==3.6.2
\ No newline at end of file
+aiohttp==3.6.2
+requests==2.20.0
diff --git a/tests_async/transport/test_aiohttp_requests.py b/tests_async/transport/test_aiohttp_requests.py
index 10c31db8f..a64a4eec9 100644
--- a/tests_async/transport/test_aiohttp_requests.py
+++ b/tests_async/transport/test_aiohttp_requests.py
@@ -112,11 +112,18 @@ def make_request(self):
         return aiohttp_requests.Request()
 
     def make_with_parameter_request(self):
-        http = mock.create_autospec(aiohttp.ClientSession, instance=True)
+        http = aiohttp.ClientSession(auto_decompress=False)
         return aiohttp_requests.Request(http)
 
+    def test_unsupported_session(self):
+        http = aiohttp.ClientSession(auto_decompress=True)
+        with pytest.raises(ValueError):
+            aiohttp_requests.Request(http)
+
     def test_timeout(self):
-        http = mock.create_autospec(aiohttp.ClientSession, instance=True)
+        http = mock.create_autospec(
+            aiohttp.ClientSession, instance=True, _auto_decompress=False
+        )
         request = aiohttp_requests.Request(http)
         request(url="http://example.com", method="GET", timeout=5)
 
@@ -142,7 +149,9 @@ def test_constructor(self):
         assert authed_session.credentials == mock.sentinel.credentials
 
     def test_constructor_with_auth_request(self):
-        http = mock.create_autospec(aiohttp.ClientSession)
+        http = mock.create_autospec(
+            aiohttp.ClientSession, instance=True, _auto_decompress=False
+        )
         auth_request = aiohttp_requests.Request(http)
 
         authed_session = aiohttp_requests.AuthorizedSession(