diff --git a/.github/workflows/coverage.yaml b/.github/workflows/coverage.yaml
index 4d711fc7..d9ea9540 100644
--- a/.github/workflows/coverage.yaml
+++ b/.github/workflows/coverage.yaml
@@ -33,7 +33,8 @@ jobs:
         with:
           python-version: "3.14"
 
-      - run: pip install nox coverage
+      - name: Install uv
+        uses: astral-sh/setup-uv@0c5e2b8115b80b4c7c5ddf6ffdd634974642d182 # v5.4.1
 
       - name: Checkout PR branch
         uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
@@ -41,17 +42,5 @@ jobs:
           ref: ${{ github.event.pull_request.head.sha }}
           repository: ${{ github.event.pull_request.head.repo.full_name }}
 
-      - name: Calculate PR code coverage
-        run: |
-          nox --sessions unit-3.14
-          coverage report --show-missing
-          export PR_COVER=$(coverage report | awk '$1 == "TOTAL" {print $NF+0}')
-          echo "PR_COVER=$PR_COVER" >> $GITHUB_ENV
-          coverage erase
-
-      - name: Verify code coverage. If your reading this and the step has failed, please add tests to cover your changes.
-        run: |
-          echo "PULL REQUEST CODE COVERAGE is ${{ env.PR_COVER }}%"
-          if [ "${{ env.PR_COVER }}" -lt "90"  ]; then
-            exit 1;
-          fi
+      - name: Verify code coverage
+        run: ./scripts/coverage.sh
diff --git a/.github/workflows/lint.yaml b/.github/workflows/lint.yaml
index c7281dfb..dd64b57c 100644
--- a/.github/workflows/lint.yaml
+++ b/.github/workflows/lint.yaml
@@ -34,8 +34,8 @@ jobs:
         with:
           python-version: "3.14"
 
-      - name: Install nox
-        run: pip install nox
+      - name: Install uv
+        uses: astral-sh/setup-uv@0c5e2b8115b80b4c7c5ddf6ffdd634974642d182 # v5.4.1
 
       - name: Checkout code
         uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
@@ -43,5 +43,5 @@ jobs:
           ref: ${{ github.event.pull_request.head.sha }}
           repository: ${{ github.event.pull_request.head.repo.full_name }}
 
-      - name: Run nox lint session
-        run: nox -s lint
+      - name: Run lint
+        run: ./scripts/lint.sh
diff --git a/.github/workflows/tests.yaml b/.github/workflows/tests.yaml
index 30b1deb7..5bf6f167 100644
--- a/.github/workflows/tests.yaml
+++ b/.github/workflows/tests.yaml
@@ -52,8 +52,8 @@ jobs:
         with:
           python-version: ${{ matrix.python-version }}
 
-      - name: Install nox
-        run: pip install nox
+      - name: Install uv
+        uses: astral-sh/setup-uv@0c5e2b8115b80b4c7c5ddf6ffdd634974642d182 # v5.4.1
 
       - id: 'auth'
         name: Authenticate to Google Cloud
@@ -66,7 +66,8 @@ jobs:
           access_token_lifetime: 600s
 
       - name: Run tests
-        run: nox -s unit-${{ matrix.python-version }}
+        shell: bash
+        run: ./scripts/test_unit.sh
 
       - name: FlakyBot (Linux)
         # only run flakybot on periodic (schedule) and continuous (push) events
@@ -118,8 +119,8 @@ jobs:
         with:
           python-version: ${{ matrix.python-version }}
 
-      - name: Install nox
-        run: pip install nox
+      - name: Install uv
+        uses: astral-sh/setup-uv@0c5e2b8115b80b4c7c5ddf6ffdd634974642d182 # v5.4.1
 
       - id: 'auth'
         name: 'Authenticate to Google Cloud'
@@ -149,7 +150,7 @@ jobs:
           ALLOYDB_INSTANCE_IP: '${{ steps.secrets.outputs.ALLOYDB_INSTANCE_IP }}'
           ALLOYDB_INSTANCE_URI: '${{ steps.secrets.outputs.ALLOYDB_INSTANCE_URI }}'
           ALLOYDB_PSC_INSTANCE_URI: '${{ steps.secrets.outputs.ALLOYDB_PSC_INSTANCE_URI }}'
-        run: nox -s system-${{ matrix.python-version }}
+        run: ./scripts/test_system.sh
 
       - name: FlakyBot (Linux)
         # only run flakybot on periodic (schedule) and continuous (push) events
diff --git a/.gitignore b/.gitignore
index b4243ced..329a6630 100644
--- a/.gitignore
+++ b/.gitignore
@@ -50,6 +50,10 @@ docs.metadata
 
 # Virtual environment
 env/
+.venv
+
+# uv lock file (library — consumers resolve their own deps)
+uv.lock
 
 # Test logs
 coverage.xml
diff --git a/google/cloud/alloydbconnector/async_connector.py b/google/cloud/alloydbconnector/async_connector.py
index b6de4116..96c265c8 100644
--- a/google/cloud/alloydbconnector/async_connector.py
+++ b/google/cloud/alloydbconnector/async_connector.py
@@ -119,10 +119,17 @@ def __init__(
 
         # check if AsyncConnector is being initialized with event loop running
         # Otherwise we will lazy init keys
+        self._keys: Optional[asyncio.Task] = None
         try:
-            self._keys: Optional[asyncio.Task] = asyncio.create_task(generate_keys())
+            # Try to get the running loop before creating a task. The call here
+            # will raise a RuntimeError if no loop is running. Without calling
+            # get_running_loop, a direct call to create_task would also raise
+            # an exception but it would leak the generate_keys coroutine. To
+            # avoid leaking the coroutine, we call get_running_loop first.
+            asyncio.get_running_loop()
+            self._keys = asyncio.create_task(generate_keys())
         except RuntimeError:
-            self._keys = None
+            pass
         self._client: Optional[AlloyDBClient] = None
         self._closed = False
 
diff --git a/google/cloud/alloydbconnector/client.py b/google/cloud/alloydbconnector/client.py
index 88b455e9..1eaf2076 100644
--- a/google/cloud/alloydbconnector/client.py
+++ b/google/cloud/alloydbconnector/client.py
@@ -18,6 +18,7 @@
 import logging
 from typing import TYPE_CHECKING
 from typing import Optional
+from typing import Union
 
 from cryptography import x509
 
@@ -95,7 +96,7 @@ def __init__(
         # API, even from multiple threads, need to be made to a single-event
         # loop. See https://github.com/GoogleCloudPlatform/alloydb-python-connector/issues/435
         # for more details.
-        self._is_sync = False
+        self._client: Union[v1beta.AlloyDBAdminClient, v1beta.AlloyDBAdminAsyncClient]
         if client:
             self._client = client
         elif driver == "pg8000" or driver == "psycopg":
@@ -110,7 +111,6 @@ def __init__(
                     user_agent=user_agent,
                 ),
             )
-            self._is_sync = True
         else:
             self._client = v1beta.AlloyDBAdminAsyncClient(
                 credentials=credentials,
@@ -163,7 +163,7 @@ async def _get_metadata(
         )
 
         req = v1beta.GetConnectionInfoRequest(parent=parent)
-        if self._is_sync:
+        if isinstance(self._client, v1beta.AlloyDBAdminClient):
             resp = self._client.get_connection_info(request=req)
         else:
             resp = await self._client.get_connection_info(request=req)
@@ -213,11 +213,11 @@ async def _get_client_certificate(
             public_key=pub_key,
             use_metadata_exchange=self._use_metadata,
         )
-        if self._is_sync:
+        if isinstance(self._client, v1beta.AlloyDBAdminClient):
             resp = self._client.generate_client_certificate(request=req)
         else:
             resp = await self._client.generate_client_certificate(request=req)
-        return (resp.ca_cert, resp.pem_certificate_chain)
+        return (resp.ca_cert, list(resp.pem_certificate_chain))
 
     async def get_connection_info(
         self,
diff --git a/noxfile.py b/noxfile.py
deleted file mode 100644
index 5eae8d07..00000000
--- a/noxfile.py
+++ /dev/null
@@ -1,135 +0,0 @@
-# Copyright 2023 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.
-
-from __future__ import absolute_import
-
-import os
-
-import nox
-
-RUFF_VERSION = "ruff==0.11.2"
-LINT_PATHS = ["google", "tests", "noxfile.py"]
-
-SYSTEM_TEST_PYTHON_VERSIONS = ["3.10", "3.11", "3.12", "3.13", "3.14"]
-UNIT_TEST_PYTHON_VERSIONS = ["3.10", "3.11", "3.12", "3.13", "3.14"]
-
-
-@nox.session
-def lint(session):
-    """Run linters.
-
-    Returns a failure if the linters find linting errors or sufficiently
-    serious code quality issues.
-    """
-    session.install("-r", "requirements-test.txt")
-    session.install("-r", "requirements.txt")
-    session.install(
-        RUFF_VERSION,
-        "mypy",
-        "build",
-        "twine",
-    )
-    session.run(
-        "ruff",
-        "format",
-        "--check",
-        "--diff",
-        *LINT_PATHS,
-    )
-    session.run(
-        "ruff",
-        "check",
-        *LINT_PATHS,
-    )
-    session.run(
-        "mypy",
-        "-p",
-        "google",
-        "--install-types",
-        "--non-interactive",
-        "--show-traceback",
-    )
-    # verify that pyproject.toml is valid
-    session.run("python", "-m", "build", "--sdist")
-    session.run("twine", "check", "--strict", "dist/*")
-
-
-@nox.session
-def format(session):
-    """Format code with ruff."""
-    session.install(RUFF_VERSION)
-    session.run(
-        "ruff",
-        "check",
-        "--fix",
-        *LINT_PATHS,
-    )
-    session.run(
-        "ruff",
-        "format",
-        *LINT_PATHS,
-    )
-
-
-@nox.session()
-def cover(session):
-    """Run the final coverage report.
-
-    This outputs the coverage report aggregating coverage from the unit
-    test runs (not system test runs), and then erases coverage data.
-    """
-    session.install("coverage", "pytest-cov")
-    session.run("coverage", "report", "--show-missing", "--fail-under=0")
-
-    session.run("coverage", "erase")
-
-
-def default(session, path):
-    # Install all test dependencies, then install this package in-place.
-    session.install("-r", "requirements-test.txt")
-    session.install(".")
-    session.install("-r", "requirements.txt")
-    # Run pytest with coverage.
-    # Using the coverage command instead of `pytest --cov`, because
-    # `pytest ---cov` causes the module to be initialized twice, which returns
-    # this error: "ImportError: PyO3 modules compiled for CPython 3.8 or older
-    # may only be initialized once per interpreter process". More info about
-    # this is stated here: https://github.com/pytest-dev/pytest-cov/issues/614.
-    session.run(
-        "coverage",
-        "run",
-        "--include=*/google/cloud/alloydbconnector/*.py",
-        "-m",
-        "pytest",
-        "-v",
-        path,
-        *session.posargs,
-    )
-    session.run(
-        "coverage",
-        "xml",
-        "-o",
-        "sponge_log.xml",
-    )
-
-
-@nox.session(python=UNIT_TEST_PYTHON_VERSIONS)
-def unit(session):
-    """Run the unit test suite."""
-    default(session, os.path.join("tests", "unit"))
-
-
-@nox.session(python=SYSTEM_TEST_PYTHON_VERSIONS)
-def system(session):
-    default(session, os.path.join("tests", "system"))
diff --git a/pyproject.toml b/pyproject.toml
index 89387b12..bf2ede8f 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -62,6 +62,31 @@ pg8000 = ["pg8000>=1.31.1"]
 asyncpg = ["asyncpg>=0.31.0"]
 psycopg = ["psycopg>=3.1.0"]
 
+[dependency-groups]
+test = [
+    "asyncpg>=0.31.0",
+    "mock>=5.2.0",
+    "pg8000>=1.31.5",
+    "psycopg2-binary>=2.9.11",
+    "psycopg>=3.3.3",
+    "psycopg-binary>=3.3.3",
+    "pytest>=9.0.2",
+    "pytest-asyncio>=1.3.0",
+    "pytest-cov>=7.0.0",
+    "SQLAlchemy[asyncio]>=2.0.48",
+    "aioresponses>=0.7.8",
+    "coverage",
+]
+lint = [
+    "ruff==0.11.2",
+    "mypy",
+    "types-aiofiles",
+    "types-requests",
+    "build",
+    "twine",
+    {include-group = "test"},
+]
+
 [tool.setuptools.dynamic]
 version = { attr = "google.cloud.alloydbconnector.version.__version__" }
 
@@ -98,7 +123,6 @@ ignore = [
 ]
 
 [tool.ruff.lint.per-file-ignores]
-"noxfile.py" = ["ANN"]
 "tests/*" = ["ANN"]
 
 [tool.ruff.lint.isort]
diff --git a/requirements-test.txt b/requirements-test.txt
deleted file mode 100644
index 84168893..00000000
--- a/requirements-test.txt
+++ /dev/null
@@ -1,11 +0,0 @@
-asyncpg==0.31.0
-mock==5.2.0
-pg8000==1.31.5
-psycopg2-binary==2.9.11
-psycopg==3.3.3
-psycopg-binary==3.3.3
-pytest==9.0.2
-pytest-asyncio==1.3.0
-pytest-cov==7.0.0
-SQLAlchemy[asyncio]==2.0.48
-aioresponses==0.7.8
diff --git a/requirements.txt b/requirements.txt
deleted file mode 100644
index 6cf86a97..00000000
--- a/requirements.txt
+++ /dev/null
@@ -1,5 +0,0 @@
-aiofiles==25.1.0
-cryptography==46.0.5
-google-auth==2.49.0
-requests==2.32.5
-protobuf==7.34.0
\ No newline at end of file
diff --git a/scripts/coverage.sh b/scripts/coverage.sh
new file mode 100755
index 00000000..50ee298f
--- /dev/null
+++ b/scripts/coverage.sh
@@ -0,0 +1,30 @@
+#!/usr/bin/env bash
+# Copyright 2026 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.
+
+set -euo pipefail
+
+uv run --group test \
+    coverage run \
+    --include="*/google/cloud/alloydbconnector/*.py" \
+    -m pytest -v tests/unit "$@"
+uv run --group test coverage report --show-missing
+PR_COVER=$(uv run --group test coverage report | awk '$1 == "TOTAL" {print $NF+0}')
+uv run --group test coverage erase
+
+echo "CODE COVERAGE is ${PR_COVER}%"
+if [ "${PR_COVER}" -lt "90" ]; then
+    echo "Coverage below 90% threshold"
+    exit 1
+fi
diff --git a/scripts/format.sh b/scripts/format.sh
new file mode 100755
index 00000000..c4b02d66
--- /dev/null
+++ b/scripts/format.sh
@@ -0,0 +1,19 @@
+#!/usr/bin/env bash
+# Copyright 2026 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.
+
+set -euo pipefail
+
+uv run --group lint ruff check --fix google tests
+uv run --group lint ruff format google tests
diff --git a/scripts/lint.sh b/scripts/lint.sh
new file mode 100755
index 00000000..fa30073d
--- /dev/null
+++ b/scripts/lint.sh
@@ -0,0 +1,22 @@
+#!/usr/bin/env bash
+# Copyright 2026 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.
+
+set -euo pipefail
+
+uv run --group lint ruff format --check --diff google tests
+uv run --group lint ruff check google tests
+uv run --group lint mypy -p google --show-traceback
+uv run --group lint python -m build --sdist
+uv run --group lint twine check --strict dist/*
diff --git a/scripts/test_system.sh b/scripts/test_system.sh
new file mode 100755
index 00000000..ee0e0d6a
--- /dev/null
+++ b/scripts/test_system.sh
@@ -0,0 +1,21 @@
+#!/usr/bin/env bash
+# Copyright 2026 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.
+
+set -euo pipefail
+
+uv run --no-editable --group test \
+    coverage run \
+    --include="*/google/cloud/alloydbconnector/*.py" \
+    -m pytest -v tests/system "$@"
diff --git a/scripts/test_unit.sh b/scripts/test_unit.sh
new file mode 100755
index 00000000..5a5b9a48
--- /dev/null
+++ b/scripts/test_unit.sh
@@ -0,0 +1,21 @@
+#!/usr/bin/env bash
+# Copyright 2026 Google LLC
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+set -euo pipefail
+
+uv run --group test \
+    coverage run \
+    --include="*/google/cloud/alloydbconnector/*.py" \
+    -m pytest -v tests/unit "$@"
diff --git a/tests/unit/mocks.py b/tests/unit/mocks.py
index 5e254b0c..43c2c8cd 100644
--- a/tests/unit/mocks.py
+++ b/tests/unit/mocks.py
@@ -477,7 +477,10 @@ def write_static_info(i: FakeInstance) -> io.StringIO:
     return io.StringIO(json.dumps(static))
 
 
-class FakeAlloyDBAdminAsyncClient:
+class FakeAlloyDBAdminAsyncClient(alloydb_v1beta.AlloyDBAdminAsyncClient):
+    def __init__(self) -> None:
+        pass
+
     async def get_connection_info(
         self, request: alloydb_v1beta.GetConnectionInfoRequest
     ) -> alloydb_v1beta.types.resources.ConnectionInfo:
@@ -510,7 +513,10 @@ async def generate_client_certificate(
         return ccr
 
 
-class FakeAlloyDBAdminClient:
+class FakeAlloyDBAdminClient(alloydb_v1beta.AlloyDBAdminClient):
+    def __init__(self) -> None:
+        pass
+
     def get_connection_info(
         self, request: alloydb_v1beta.GetConnectionInfoRequest
     ) -> alloydb_v1beta.types.resources.ConnectionInfo:
diff --git a/tests/unit/test_client.py b/tests/unit/test_client.py
index 208ca029..f7776fa6 100644
--- a/tests/unit/test_client.py
+++ b/tests/unit/test_client.py
@@ -87,7 +87,6 @@ async def test__get_metadata_with_async_client(credentials: FakeCredentials) ->
     Test _get_metadata returns successfully for an async client.
     """
     test_client = AlloyDBClient("", "", credentials, FakeAlloyDBAdminAsyncClient())
-    test_client._is_sync = False
     assert (
         await test_client._get_metadata(
             "test-project",
@@ -104,7 +103,6 @@ async def test__get_metadata_with_sync_client(credentials: FakeCredentials) -> N
     Test _get_metadata returns successfully for a sync client.
     """
     test_client = AlloyDBClient("", "", credentials, FakeAlloyDBAdminClient())
-    test_client._is_sync = True
     assert (
         await test_client._get_metadata(
             "test-project",
@@ -140,7 +138,6 @@ async def test__get_client_certificate_with_async_client(
     Test _get_client_certificate returns successfully for an async client.
     """
     test_client = AlloyDBClient("", "", credentials, FakeAlloyDBAdminAsyncClient())
-    test_client._is_sync = False
     keys = await generate_keys()
     assert (
         await test_client._get_client_certificate(
@@ -157,7 +154,6 @@ async def test__get_client_certificate_with_sync_client(
     Test _get_client_certificate returns successfully for a sync client.
     """
     test_client = AlloyDBClient("", "", credentials, FakeAlloyDBAdminClient())
-    test_client._is_sync = True
     keys = await generate_keys()
     assert (
         await test_client._get_client_certificate(
@@ -211,7 +207,6 @@ async def test_AlloyDBClient_init_specified_client(
         credentials,
         FakeAlloyDBAdminAsyncClient(),
     )
-    assert client._is_sync is False
     assert type(client._client) is FakeAlloyDBAdminAsyncClient
 
 
@@ -223,7 +218,6 @@ async def test_AlloyDBClient_init_sync_client(credentials: FakeCredentials) -> N
     client = AlloyDBClient(
         "www.test-endpoint.com", "my-quota-project", credentials, driver="pg8000"
     )
-    assert client._is_sync is True
     assert type(client._client) is v1beta.AlloyDBAdminClient
     assert client._client.transport.kind == "grpc"
 
@@ -236,7 +230,6 @@ async def test_AlloyDBClient_init_async_client(credentials: FakeCredentials) ->
     client = AlloyDBClient(
         "www.test-endpoint.com", "my-quota-project", credentials, driver=""
     )
-    assert client._is_sync is False
     assert type(client._client) is v1beta.AlloyDBAdminAsyncClient
     assert client._client.transport.kind == "grpc_asyncio"