diff --git a/.github/workflows/unit-tests.yml b/.github/workflows/unit-tests.yml
index 1e36e79c..af8f1579 100644
--- a/.github/workflows/unit-tests.yml
+++ b/.github/workflows/unit-tests.yml
@@ -10,22 +10,21 @@ on:
 
 jobs:
   bigquery:
+    # Add "id-token" with the intended permissions.
+    permissions:
+      contents: read
+      id-token: write
     runs-on: ubuntu-latest
     strategy:
       fail-fast: false
       matrix:
         include:
-          # Python 3.8
-          - python-version: "3.8"
-            pip-requirements: "requirements-1.6.txt"
-          - python-version: "3.8"
-            pip-requirements: "requirements-1.7.txt"
           # Python 3.9
           - python-version: "3.9"
             pip-requirements: "requirements-1.6.txt"
           - python-version: "3.9"
             pip-requirements: "requirements-1.7.txt"
-          - python-version: "3.8"
+          - python-version: "3.9"
             pip-requirements: "requirements-1.8.txt"
           # Python 3.10
           - python-version: "3.10"
@@ -34,6 +33,8 @@ jobs:
             pip-requirements: "requirements-1.7.txt"
           - python-version: "3.10"
             pip-requirements: "requirements-1.8.txt"
+          - python-version: "3.10"
+            pip-requirements: "requirements-1.9.txt"
           # Python 3.11
           - python-version: "3.11"
             pip-requirements: "requirements-1.6.txt"
@@ -41,20 +42,30 @@ jobs:
             pip-requirements: "requirements-1.7.txt"
           - python-version: "3.11"
             pip-requirements: "requirements-1.8.txt"
+          - python-version: "3.11"
+            pip-requirements: "requirements-1.9.txt"
           # Python 3.12
           - python-version: "3.12"
             pip-requirements: "requirements-1.8.txt"
+          - python-version: "3.12"
+            pip-requirements: "requirements-1.9.txt"
     defaults:
       run:
         shell: bash
     steps:
       - name: Checkout
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
       - uses: actions/setup-python@v5
         with:
           python-version: ${{ matrix.python-version }}
           cache: 'pip'
           cache-dependency-path: '**/${{ matrix.pip-requirements }}'
+      # dbt-bigquery 1.9 required the application default credentials
+      # SEE https://github.com/dbt-labs/dbt-bigquery/issues/1438
+      - uses: google-github-actions/auth@v2
+        with:
+          workload_identity_provider: projects/131500153501/locations/global/workloadIdentityPools/github-oidc-pool/providers/github-oidc-provider
+          service_account: dbt-data-privacy@ubie-oss-data-engineering.iam.gserviceaccount.com
       - name: Install dbt
         working-directory: "${{ github.workspace }}/integration_tests"
         run: |
diff --git a/integration_tests/requirements/requirements-1.9.txt b/integration_tests/requirements/requirements-1.9.txt
new file mode 100644
index 00000000..4ed5c97a
--- /dev/null
+++ b/integration_tests/requirements/requirements-1.9.txt
@@ -0,0 +1,4 @@
+dbt-bigquery>=1.9,<1.10
+dbt-core>=1.9,<1.10
+
+pytz>=2015.7